Here,N-and P-doped carbon-carbon nanotube CoP(NPC-CNTs-CoP)nanoparticles dodecahedra are achieved by multistep calcination of the Zn-doped zeolitic imidazolate framework ZIF-67 precursor(ZnCo-ZIF).In the structures,th...Here,N-and P-doped carbon-carbon nanotube CoP(NPC-CNTs-CoP)nanoparticles dodecahedra are achieved by multistep calcination of the Zn-doped zeolitic imidazolate framework ZIF-67 precursor(ZnCo-ZIF).In the structures,the presence of N and P atoms,abundant CNTs and the CoP nanoparticles can enhance electrochemical activity and promote the structural stability of materials.As the temperature increases,the Zn contents gradually reduce to zero,which provides more active sites for electrochemical testing.Furthermore,the high specific surface area and microporous behavior of NPC-CNTsCoP-9 make it excellent in electrocatalytic testing.NPCCNTs-CoP-9 shows a low overpotential of 224 mV at10 mA·cm^-2 in 1.0 mol·L^-1 KOH solution.The strategy of zeolitic imidazole framework-derived transition metal phosphides will provide a new sight for developing energy conversion materials.展开更多
Porous nanomaterials are classified as a kind of materials with great potential for development in the field of electrocatalysis,but there is still room for further improve ment as catalysts.We develop a threedimensio...Porous nanomaterials are classified as a kind of materials with great potential for development in the field of electrocatalysis,but there is still room for further improve ment as catalysts.We develop a threedimensional(3D)porous structure of Cu/Cu2O as an electrocatalyst for the glucose oxidation reaction(GOR)using the method of calcining the precursor CuC2O4·2H2O in N2.The obtained porous Cu/Cu2O nanostructure can provide more opportunities for effective reactions between particles,which can explain their efficient electrocatalytic performance.Additionally,the as-synthesized Cu/Cu2O nanostructure exhibits outstanding electrocatalytic performance for the glucose,including good stability,excellent sensitivity and remarkable selectivity.展开更多
In this research,a novel bird nest-like zinc oxide(BN-ZnO)nanostructures were prepared by a simple solvothermal method.A sensitive electrochemical glucose biosensor was for the first time developed based on the immobi...In this research,a novel bird nest-like zinc oxide(BN-ZnO)nanostructures were prepared by a simple solvothermal method.A sensitive electrochemical glucose biosensor was for the first time developed based on the immobilization of glucose oxidase(GOx)on nanostructured BN-ZnO modified electrode.The BN-ZnO nanostructure and the resultant biosensor were characterized by scanning electron microscope,X-ray diffraction spectroscopy,Fourier transform infrared spectroscopy,and electrochemical impedance spectroscopy.BN-ZnO nanostructures have large specific surface area and can load large amounts of GOx molecules.Meanwhile,BN-ZnO provides an excellent microenvironment to retain the native bioactivity of enzymes and to promote direct electron transfer between GOx and electrode surface.The proposed biosensor shows a wide linear range of 0.005–1.6 mmol/L,high sensitivity of15.6 mA L mol^(-1)cm^(-2)with a low detection limit of 0.004 mmol/L.The resulting biosensor also shows excellent selectivity,acceptable stability and reproducibility,and can be successfully applied in the detection of glucose in human serum samples at-0.37 V.展开更多
The remarkable development of nanotechnology and nanoscience has greatly promoted the vigorous development of the field of nanomaterials.This study explores a porous cuboid Ni/NiO composite nanomaterial obtained by ca...The remarkable development of nanotechnology and nanoscience has greatly promoted the vigorous development of the field of nanomaterials.This study explores a porous cuboid Ni/NiO composite nanomaterial obtained by calcining NiC_(2)O_(4)·2H_(2)O under a N_(2)environment.The composite affords direct electrochemical activity and good electrocatalytic properties.Compared to uncalcined precursor,the porous Ni/NiO obtained after calcination exhibited higher catalytic activity for glucose oxidation with higher sensitivity.Moreover,because of its regular cube structure the as-synthesized Ni/NiO exhibited improved electrochemical stability.Such porous Ni/NiO nanocubes represent promising glucose catalyst with high sensitivity and selectivity,improved stability and fast amperometric response.展开更多
Through the survey on agricultural technology extension system in Hanjiang District of Yangzhou City,this paper analyzed possible problems in the agricultural technology extension system.Combining with newly revised A...Through the survey on agricultural technology extension system in Hanjiang District of Yangzhou City,this paper analyzed possible problems in the agricultural technology extension system.Combining with newly revised Agricultural Technology Extension Law and modern agricultural extension theory,it discussed the new development direction.Finally,it came up with approaches and measures for establishing the agricultural technology extension system in Hanjiang District.展开更多
Hierarchical NiO nanosheets@nanorods have been rationally designed and constructed for efficient urea electrooxidation in an alkaline solution. The critical synthetic strategy, engaging the one-step anioncompetitive r...Hierarchical NiO nanosheets@nanorods have been rationally designed and constructed for efficient urea electrooxidation in an alkaline solution. The critical synthetic strategy, engaging the one-step anioncompetitive reaction, precisely integrates two nickel-based materials into a heterostructure with Ni(OH)_(2) nanosheets and NiC_(2)O_(4) nanorods. Benefiting from the hierarchically porous structure and high specific surface area, the NiO NNs can improve the escape efficiency of gas in electrochemical reactions and maintain sustainability. Furthermore, this distinctive structure can expose highly dispersed active sites for enhancing urea molecules' adsorption, surface-dependent redox reactions, and electrical conductivities. As a result, these hierarchical NiO nanosheets@nanorods exhibit superior activity with a low overpotential of 156 mV at 10 mA/cm^(2), and a slight Tafel slope of 40.7 m V/dec, and high stability with almost no decay of 12,000 s for urea electrooxidation. This work promotes the application of well-designed hierarchical structure in electrooxidizing urea and provides a possibility for highly efficient electrolysis of alkaline urea wastewater.展开更多
A novel nitrogen-doped carbon quantum dots(N-CDs)were prepared by the microwave irradiation method.The fluorescence quenching effect of Co(II)on the N-CDs was studied in the sodium dodecyl sulfate(SDS)medium and the f...A novel nitrogen-doped carbon quantum dots(N-CDs)were prepared by the microwave irradiation method.The fluorescence quenching effect of Co(II)on the N-CDs was studied in the sodium dodecyl sulfate(SDS)medium and the fluorescence quenching was sensitized in the SDS.The linear range of calibration curve for the determination of Co(II)was 0.17 pg/mL-11.8 pg/mL and the limit of detection was 0.052 pg/mL.The method has been applied for the determination of Co(II)in samples with satisfactory results.展开更多
The construction of highly stable and regular nanoreactors is a major challenge.In this work,we use a facile template protection method to obtain ZIF-67@SiO_(2)(JS)and to encapsulate metal oxide nanoparticles(Co_(3)O_...The construction of highly stable and regular nanoreactors is a major challenge.In this work,we use a facile template protection method to obtain ZIF-67@SiO_(2)(JS)and to encapsulate metal oxide nanoparticles(Co_(3)O_(4))into nanoreactors(SiO_(2)).ZIF-67 crystals provide a cobalt species;SiO_(2)was first used as a protective layer of ZIF-67 and then as a nanoreactor for metastable metal oxide nanoparticles.On this basis,Co_(3)O_(4)@SiO_(2)with dodecahedron morphology were synthesized by calcining JS at different tempe ratures,followed by a hydrothermal reaction to obtain Co_(3)(OH)4Si_(2)O_(5).Subsequently,CoSx and CoP-SiO_(2)were fabricated through sulfuration and phosphorization.The results in this work show that nanoreactors derived from metal-organic frameworks(MOFs)with a rational structure have broad development prospects.展开更多
Two-dimensional(2D)metal-organic frameworks(MOFs)are promising for electrocatalysis with high performance,as they possess large surface areas and high densities of exposed active sites.It attracts tremendous attention...Two-dimensional(2D)metal-organic frameworks(MOFs)are promising for electrocatalysis with high performance,as they possess large surface areas and high densities of exposed active sites.It attracts tremendous attention to obtain 2D nanostructures via simple preparation methods.Herein,a facile pyridine-modulated solvothermal synthesis of Ni/Co bimetallic MOF nanoplates(NixCoy-bpy(PyM))is reported with well-defined 2D morphology with a thickness as thin as 20 nm and an aspect ratio larger than 50.These nanoplates possess oxygen evolution reaction activity as electrocatalysts in alkaline conditions.Specifically,Ni0.5Co1.5-bpy(PyM)exhibits excellent OER electrocatalytic activity with a low overpotential of 256 mV at 10 m A cm-2 and a small Tafel slope of 81.8 mV dec-1 in 1.0 mol L-1 KOH with long-term electrochemical stability for 3000 cyclic voltammetry cycles.The high catalytic activity of Ni0.5Co1.5-bpy(PyM)can be attributed to the in situ formed active hydroxide and oxyhydroxide species within the inherited 2D morphology and the optimized bimetallic ratio.展开更多
Lithium-sulfur batteries(LSBs)have received much concern as emerging high-power energy storage system.Nevertheless,the low conductivity of sulfur and poly sulfide shuttle results in low rate capability and rapid capac...Lithium-sulfur batteries(LSBs)have received much concern as emerging high-power energy storage system.Nevertheless,the low conductivity of sulfur and poly sulfide shuttle results in low rate capability and rapid capacity decay,which seriously limit its commercial application.Here,facile,sustainable and cost-effective strategy for preparing heteroatom-doped porous activated carbon(PAC)derived from biomass palm kernel shell(PKS)was developed for high-performance LSB applications.The presence of N,P and S heteroatoms with modification of the surface polarity brings about large amounts of active sites and improved adsorption property compared to those of common carbon materials.The PAC sample possesses desirable specific surface area(SSA)(2760 m2·g-1)as well as pore volume(1.6 cm3·g-1).Besides,the good electrical conductivity of PAC endows the material with excellent rate performance.The PAC-S electrode with a 60%of sulfur loading has a desirable first discharge capacity(1045 mAh·g1,200 mA·g-1)with superb discharge capacity(869.8 mAh·g-1,100 th cycle)and cyclability(312.6 mAh·g-1,800 mA·g-1,1000 th cycle),which can be mainly ascribed to its unique porous properties and the good conductivity of PAC.展开更多
Transition-metal selenides(M_xSe_y,M = Fe,Co,Ni)and their composites exhibit good storage capacities for sodium and lithium ions and occupy a unique position in research on sodium-ion and lithium-ion batteries.MxSey a...Transition-metal selenides(M_xSe_y,M = Fe,Co,Ni)and their composites exhibit good storage capacities for sodium and lithium ions and occupy a unique position in research on sodium-ion and lithium-ion batteries.MxSey and their composites are used as active materials to improve catalytic activity.However,low electrical conductivity,poor cycle stability,and low rate performance severely limit their applications.This review provides a comprehensive introduction to and understanding of the current research progress of M_xSe_y and their composites.Moreover,this review proposes a broader research platform for these materials,including various bioelectrocatalytic performance tests,lithium-sulfur batteries,and fuel cells.The synthesis method and related mechanisms of M_xSe_y and their composites are reviewed,and the effects of material morphologies on their electrochemical performance are discussed.The advantages and disadvantages of M_xSe_y and their composites as well as possible strategies for improving the storage and conversion of electrochemical energy are also summarized.展开更多
A synthetic method of dialkylideneacetones has been developed. Compared with known protocols, the method employed catalytic Ca(OH)_2 as the cheap, mild base catalyst and dilute aqueous EtOH(20%, v/v)as the green and s...A synthetic method of dialkylideneacetones has been developed. Compared with known protocols, the method employed catalytic Ca(OH)_2 as the cheap, mild base catalyst and dilute aqueous EtOH(20%, v/v)as the green and safe solvent. The procedure was easily operated: In most cases, the product could be isolated by a simple filtration, and purified by washing with water. This paper provided experimental details of the reactions, which could be applied in gram-scale synthesis and should be a very reliable and practical protocol to prepare these useful compounds in laboratory and at the industrial level.展开更多
A self-developed taper barrel rheomoulding(TBR)machine was introduced,and the rheo-diecasting process was implemented by combining TBR machine with the high pressure die casting(HPDC)machine.Microstructural characteri...A self-developed taper barrel rheomoulding(TBR)machine was introduced,and the rheo-diecasting process was implemented by combining TBR machine with the high pressure die casting(HPDC)machine.Microstructural characteristics of the rheo-diecasting components were investigated at different rotation speeds.Flow characteristics and microstructural evolution of the semi-solid slurry during the rheo-diecasting process were analyzed and the mechanical properties of the rheo-diecasting components were studied.The experimental results show that the process is able to obtain such components in which the primaryα-Mg particles are fine,nearly spherical and uniformly distributed in the matrix.When the rotation speed of internal taper barrel is 700 r/min,the primaryα-Mg particles get a mean diameter of about 45μm and a shape factor of about 0.81.The magnesium alloy melt has complex stirring-fixed flow characteristics when flowing in TBR machine.Compared with conventional die-casing process,the rheo-diecasting process can improve the mechanical properties of components;especially,the elongation is improved by 80%.展开更多
This paper first analyzes the important role of Nanfan Base in China: " accelerator" for breeding new varieties of crops; " unallocated store" to ensure the varieties for agricultural production; &...This paper first analyzes the important role of Nanfan Base in China: " accelerator" for breeding new varieties of crops; " unallocated store" to ensure the varieties for agricultural production; " lightning rod" to ensure the quality and safety of seeds; " big stage" for variety and technical exchanges and cooperation; " big school" for cultivating seed industry technology talents; " booster" for promoting local economic development. Then it points out the main problems about Nanfan Base and finally sets forth the relevant recommendations.展开更多
Deoximation reaction is one of the most important transformations in organic synthesis and for fine chemical production.Since oximes are easily synthesized from carbonyl compounds and are stable compounds,this reactio...Deoximation reaction is one of the most important transformations in organic synthesis and for fine chemical production.Since oximes are easily synthesized from carbonyl compounds and are stable compounds,this reaction can be used for protection-deprotection,purification,and characterization of carbonyl compounds in organic synthesis,especially for the synthesis of medicines as well as the natural products.Moreover,because many oximes can be synthesized from non-carbonyl starting materials,the deoximation reaction is also widely used in the production of many carbonyl-contained fine chemicals.Deoximation methods by using stoichiometric reagents are mature and can produce the related carbonyl products in very high yield with broad substrate application scopes.But for environment-protection consideration as well as the production cost controlling purpose in fine chemical industry,developing catalytic deoximation methods is the trend of the field and there are a series of references on this topic in recent years.This short review summarized recent advances on the development of deoximation methods from stoichiometric reaction to catalytic reaction and the mechanisms of some important transformations were discussed in detail for reader reference.展开更多
Low temperature in early spring impairs wheat growth and grain yield.However,little is known about the cytological and molecular mechanisms underlying low temperature regulation of wheat spike development.Microstructu...Low temperature in early spring impairs wheat growth and grain yield.However,little is known about the cytological and molecular mechanisms underlying low temperature regulation of wheat spike development.Microstructure observation and transcriptome sequencing of wheat spikes under low temperature were conducted.Low temperature slowed spike development,reduced the yield-component parameters of wheat spikes at the harvest stage,delayed the formation of lateral spikelets and tissue development,and induced the early differentiation of terminal spikelets.Low temperature increased the content of abscisic acid and caused the upregulation of genes in the abscisic acid signaling pathway,including those encoding PP2 Cs,Sn RK2 s,and b ZIP transcription factors.Low temperature also induced the upregulation of 33 cold-responsive genes involved in wheat response to low-temperature stress and regulation of abscisic acid biosynthesis and metabolism of other substances.The wheat spike adapted to cold conditions by changing the expression levels of genes involved in spike morphogenesis,including the transcription-factor genes MADS6,ERF4,ERF78,WOX6,and NAC48.These findings suggest that low temperature in early spring delays wheat spike development by increasing abscisic acid content or affecting the expression of genes involved in morphogenesis.展开更多
Selenization of Fe2O3 with NaHSe led to Se/Fe3O4.The unexpected generation of Fe3O4 attributed to the reduction conditions of the reaction,and the resulted magnetic features of the material facilitated its separation ...Selenization of Fe2O3 with NaHSe led to Se/Fe3O4.The unexpected generation of Fe3O4 attributed to the reduction conditions of the reaction,and the resulted magnetic features of the material facilitated its separation in practical applications.Owning to the synergistic effect of Se with Fe,the material was especially active to catalyze the oxidative C=C scission using O2 as mild oxidant.The technique has been successfully applied in polyene degradation project,which is of profound practical values for the treatment of the polyene pigment pollution and may be applied in the food and pha rmaceutical industry.展开更多
In this work,a high-efficiency photocatalytic BiOCl material with a visible light absorption range was successfully prepared by one-pot molecular self-assembly and particle recrystallization method at room temperature...In this work,a high-efficiency photocatalytic BiOCl material with a visible light absorption range was successfully prepared by one-pot molecular self-assembly and particle recrystallization method at room temperature.In the process of crystal growth,tartaric acid,as a structure control agent,gradually transforms the stacked two-dimensional nano-sheet-like BiOCl into a hierarchical structure composed of petallike nano-sheets through hydrogen bonding.Besides,the acid etching of organic carboxylic acid on the crystal surface increases the number of micropores and mesopores,thereby the reaction interface.The thiourea(TU)molecules adsorbed on the BiOCl surface with a strong electronic effect introduce oxygen vacancies(OVs)under the condition of low oxygen content.The synergistic effect of hierarchical structure and OVs reduces the recombination of photogenerated carriers,but absorbs more O_(2)and OH−to generate a large number of superoxide radicals(·O_(2)−)and hydroxyl radicals(·OH)effectively.The photocatalytic performance of the synthesized BiOCl material has been significantly improved,and it can effectively degrade 94.15%of rhodamine B(RhB)within 20 min.Furthermore,90.95%of tetracycline(TC),93.76%of ciprofloxacin(CIP),and 85.53%of methyl orange(MO)can be removed in 80 min.Therefore,our work provides an effective method for preparing BiOCl with visible light catalytic activity,which,of course,can be used to treat and repair actual environmental problems under mild conditions.展开更多
Plant mitochondrial phosphate transporters regulate phosphate transport and ATP synthesis. Determining whether they function in abiotic stress response process would shed light on their response to salt stress. We use...Plant mitochondrial phosphate transporters regulate phosphate transport and ATP synthesis. Determining whether they function in abiotic stress response process would shed light on their response to salt stress. We used the CRISPR/Cas9 gene-editing system to mutagenize two mitochondrial phosphate transporters, OsMPT3;1 and OsMPT3;2, to investigate their regulatory roles under salt stress. Two cas9(CRISPR-associated protein9)-free homozygous mutants, mpt33 and mpt30, were confirmed to be stable. Both OsMPT3;1 and OsMPT3;2 were markedly induced by salt stress, and their mutagenesis strongly inhibited growth and development, especially under salt stress. Mutagenesis sharply reduced the accumulation of ATP, phosphate, calcium, soluble sugar, and proline and increased osmotic potential, malondialdehyde, and Na^+ /K^+ ratio under salt stress. Both mutants demonstrate normal growth and development in the presence of ATP, revealing high sensitivity to exogenous ATP under salt stress. The mutants showed lowered rates of Na^+ efflux but also of K^+ and Ca^(2+) influx under salt stress. Mutagenesis of OsMPT3;2 altered the enrichment profiles of differentially expressed genes involved mainly in synthesis of secondary metabolites, metabolism of glycolysis, pyruvate, tricarboxylic acid cycle, in response to salt stress. The mutant displayed significant accumulation differences in 14 metabolites involved in 17 metabolic pathways, and strongly up-regulated the accumulation of glutamine, a precursor in proline synthesis, under salt stress. These findings suggest that the OsMPT3 gene modulates phosphate transport and energy supply for ATP synthesis and triggers changes in accumulation of ions and metabolites participating in osmotic regulation in rice under salt stress, thus increasing rice salt tolerance. This study demonstrates the effective application of CRISPR/Cas9 gene-editing to the investigation of plant functional genes.展开更多
Silicon(Si) materials as anode materials for applications in lithium-ion batteries(LIBs) have received increasing attention.Among the Si materials,the electrochemical properties of SiOx-based(0<x≤2)composites are ...Silicon(Si) materials as anode materials for applications in lithium-ion batteries(LIBs) have received increasing attention.Among the Si materials,the electrochemical properties of SiOx-based(0<x≤2)composites are the most prominent.However,due to the cycling stability of SiOx being far from practical,there are some problems,such as Iow initial coulombic efficiency(ICE),obvious volume expansion and poor conductivity.Researchers in various countries have optimized the electrochemical properties of SiOx-based composites by means of pore formation,surface modification,and the choice of constituents.In this review,SiOx-based composites are classified into three categories based on the valency of Si(SiO2 composites,SiO composites and SiOx(0<x<2) composites).The synthesis,morphologies and electrochemical properties of the SiOx-based composites that are applied in LIB are discussed.Finally,the prope rties of several common SiOx-based composites are briefly compared and the challenges faced by SiOx-based composites are highlight.展开更多
基金financially supported by the National Natural Science Foundation of China(No.21671170)the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP)+2 种基金Program for New Century Excellent Talents of the University in China(No.NCET-13-0645)the Six Talent Plan(No.2015-XCL-030)the Program for Colleges Natural Science Research in Jiangsu Province(No.18KJB150036)。
文摘Here,N-and P-doped carbon-carbon nanotube CoP(NPC-CNTs-CoP)nanoparticles dodecahedra are achieved by multistep calcination of the Zn-doped zeolitic imidazolate framework ZIF-67 precursor(ZnCo-ZIF).In the structures,the presence of N and P atoms,abundant CNTs and the CoP nanoparticles can enhance electrochemical activity and promote the structural stability of materials.As the temperature increases,the Zn contents gradually reduce to zero,which provides more active sites for electrochemical testing.Furthermore,the high specific surface area and microporous behavior of NPC-CNTsCoP-9 make it excellent in electrocatalytic testing.NPCCNTs-CoP-9 shows a low overpotential of 224 mV at10 mA·cm^-2 in 1.0 mol·L^-1 KOH solution.The strategy of zeolitic imidazole framework-derived transition metal phosphides will provide a new sight for developing energy conversion materials.
基金the National Natural Science Foundation of China(NSFC,Nos.21671170,21673203 and 21201010)the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP)+4 种基金Program for Academic Science and Technology Innovation Fund for College Students of Guangling College in Yangzhou University(No.YJ20180501)the Six Talent Plan(No.2015-XCL-030)Qinglan Project of Jiangsu and Program for Colleges Natural Science Research in Jiangsu Province(No.18KJB150036)the Science and Technology Innovation Foster Foundation of Yangzhou University(No.2016CXJ010)the Priority Academic Program Development of Jiangsu Higher Education Institutions。
文摘Porous nanomaterials are classified as a kind of materials with great potential for development in the field of electrocatalysis,but there is still room for further improve ment as catalysts.We develop a threedimensional(3D)porous structure of Cu/Cu2O as an electrocatalyst for the glucose oxidation reaction(GOR)using the method of calcining the precursor CuC2O4·2H2O in N2.The obtained porous Cu/Cu2O nanostructure can provide more opportunities for effective reactions between particles,which can explain their efficient electrocatalytic performance.Additionally,the as-synthesized Cu/Cu2O nanostructure exhibits outstanding electrocatalytic performance for the glucose,including good stability,excellent sensitivity and remarkable selectivity.
基金the financial support from the National Natural Science Foundation of China(Nos.21575125,21475116)the Natural Science Foundation of Jiangsu Province(No.BK20191434)+8 种基金333 ProjectQinglan Project of Jiangsu Provincehigh-end talent support program of Yangzhou University for Zhanjun Yang,and Juan LiPriority Academic Program Development of Jiangsu Higher Education Institution(PAPD)Six Talent Peaks Project of Jiangsu Province for Zhanjun Yang and Juan Li,Project for Science and Technology of Yangzhou(No.YZ2020068)the Project for Science and Technology of Zhenjiang(No.GY2020028)Zhejiang Provincial Natural Science Foundation of China(No.LY20B050008)Zhejiang Provincial Project of Medical and Health Technology(No.2021RC139)Key Project of Social Development of Jinhua(No.2020-3-033)。
文摘In this research,a novel bird nest-like zinc oxide(BN-ZnO)nanostructures were prepared by a simple solvothermal method.A sensitive electrochemical glucose biosensor was for the first time developed based on the immobilization of glucose oxidase(GOx)on nanostructured BN-ZnO modified electrode.The BN-ZnO nanostructure and the resultant biosensor were characterized by scanning electron microscope,X-ray diffraction spectroscopy,Fourier transform infrared spectroscopy,and electrochemical impedance spectroscopy.BN-ZnO nanostructures have large specific surface area and can load large amounts of GOx molecules.Meanwhile,BN-ZnO provides an excellent microenvironment to retain the native bioactivity of enzymes and to promote direct electron transfer between GOx and electrode surface.The proposed biosensor shows a wide linear range of 0.005–1.6 mmol/L,high sensitivity of15.6 mA L mol^(-1)cm^(-2)with a low detection limit of 0.004 mmol/L.The resulting biosensor also shows excellent selectivity,acceptable stability and reproducibility,and can be successfully applied in the detection of glucose in human serum samples at-0.37 V.
基金supported by the National Natural Science Foundation of China(NSFC,Nos.U1904215 and 21671170)the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP)Program for Young Changjiang Scholars of the Ministry of Education,China(No.Q2018270)。
文摘The remarkable development of nanotechnology and nanoscience has greatly promoted the vigorous development of the field of nanomaterials.This study explores a porous cuboid Ni/NiO composite nanomaterial obtained by calcining NiC_(2)O_(4)·2H_(2)O under a N_(2)environment.The composite affords direct electrochemical activity and good electrocatalytic properties.Compared to uncalcined precursor,the porous Ni/NiO obtained after calcination exhibited higher catalytic activity for glucose oxidation with higher sensitivity.Moreover,because of its regular cube structure the as-synthesized Ni/NiO exhibited improved electrochemical stability.Such porous Ni/NiO nanocubes represent promising glucose catalyst with high sensitivity and selectivity,improved stability and fast amperometric response.
基金Supported by Agricultural Technology Extension Project of Central Finance
文摘Through the survey on agricultural technology extension system in Hanjiang District of Yangzhou City,this paper analyzed possible problems in the agricultural technology extension system.Combining with newly revised Agricultural Technology Extension Law and modern agricultural extension theory,it discussed the new development direction.Finally,it came up with approaches and measures for establishing the agricultural technology extension system in Hanjiang District.
基金supported by the National Natural Science Foundation of China (No. U1904215)Natural Science Foundation of Jiangsu Province (No. BK20200044)+2 种基金Program for Young Changjiang Scholars of the Ministry of Education, China (No. Q2018270)the Priority Academic Program Development of Jiangsu Higher Education InstitutionsNatural Science Research Project of Guangling College, Yangzhou University (No. ZKZD22004)。
文摘Hierarchical NiO nanosheets@nanorods have been rationally designed and constructed for efficient urea electrooxidation in an alkaline solution. The critical synthetic strategy, engaging the one-step anioncompetitive reaction, precisely integrates two nickel-based materials into a heterostructure with Ni(OH)_(2) nanosheets and NiC_(2)O_(4) nanorods. Benefiting from the hierarchically porous structure and high specific surface area, the NiO NNs can improve the escape efficiency of gas in electrochemical reactions and maintain sustainability. Furthermore, this distinctive structure can expose highly dispersed active sites for enhancing urea molecules' adsorption, surface-dependent redox reactions, and electrical conductivities. As a result, these hierarchical NiO nanosheets@nanorods exhibit superior activity with a low overpotential of 156 mV at 10 mA/cm^(2), and a slight Tafel slope of 40.7 m V/dec, and high stability with almost no decay of 12,000 s for urea electrooxidation. This work promotes the application of well-designed hierarchical structure in electrooxidizing urea and provides a possibility for highly efficient electrolysis of alkaline urea wastewater.
基金The authors acknowledge Yangzhou University and funding projects.This paper is funded by the National Natural Science Foundation of China(Grant No.21375117)the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘A novel nitrogen-doped carbon quantum dots(N-CDs)were prepared by the microwave irradiation method.The fluorescence quenching effect of Co(II)on the N-CDs was studied in the sodium dodecyl sulfate(SDS)medium and the fluorescence quenching was sensitized in the SDS.The linear range of calibration curve for the determination of Co(II)was 0.17 pg/mL-11.8 pg/mL and the limit of detection was 0.052 pg/mL.The method has been applied for the determination of Co(II)in samples with satisfactory results.
基金supported by the National Natural Science Foundation of China(NSFC,Nos.21671170,21673203)the Topnotch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP)+2 种基金Program for New Century Excellent Talents of the University in China(NCET,No.13-0645)the Six Talent Plan(No.2015-XCL-030)Qinglan Project。
文摘The construction of highly stable and regular nanoreactors is a major challenge.In this work,we use a facile template protection method to obtain ZIF-67@SiO_(2)(JS)and to encapsulate metal oxide nanoparticles(Co_(3)O_(4))into nanoreactors(SiO_(2)).ZIF-67 crystals provide a cobalt species;SiO_(2)was first used as a protective layer of ZIF-67 and then as a nanoreactor for metastable metal oxide nanoparticles.On this basis,Co_(3)O_(4)@SiO_(2)with dodecahedron morphology were synthesized by calcining JS at different tempe ratures,followed by a hydrothermal reaction to obtain Co_(3)(OH)4Si_(2)O_(5).Subsequently,CoSx and CoP-SiO_(2)were fabricated through sulfuration and phosphorization.The results in this work show that nanoreactors derived from metal-organic frameworks(MOFs)with a rational structure have broad development prospects.
基金supported by the National Natural Science Foundation of China(U1904215,21671170 and 21875207)the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP)+4 种基金the Program for New Century Excellent Talents of the University in China(NCET-13-0645)the Six Talent Plan(2015XCL-030)Qinglan Projectthe Priority Academic Program Development of Jiangsu Higher Education Institutionsthe support from the postdoctoral fund of Yangzhou University。
文摘Two-dimensional(2D)metal-organic frameworks(MOFs)are promising for electrocatalysis with high performance,as they possess large surface areas and high densities of exposed active sites.It attracts tremendous attention to obtain 2D nanostructures via simple preparation methods.Herein,a facile pyridine-modulated solvothermal synthesis of Ni/Co bimetallic MOF nanoplates(NixCoy-bpy(PyM))is reported with well-defined 2D morphology with a thickness as thin as 20 nm and an aspect ratio larger than 50.These nanoplates possess oxygen evolution reaction activity as electrocatalysts in alkaline conditions.Specifically,Ni0.5Co1.5-bpy(PyM)exhibits excellent OER electrocatalytic activity with a low overpotential of 256 mV at 10 m A cm-2 and a small Tafel slope of 81.8 mV dec-1 in 1.0 mol L-1 KOH with long-term electrochemical stability for 3000 cyclic voltammetry cycles.The high catalytic activity of Ni0.5Co1.5-bpy(PyM)can be attributed to the in situ formed active hydroxide and oxyhydroxide species within the inherited 2D morphology and the optimized bimetallic ratio.
基金financially supported by the National Natural Science Foundation of China(Nos.21671170,21673203,21805136 and 21201010)the Natural Science Foundation of Jiangsu Province(No.BK20170999)+2 种基金Program for New Century Excellent Talents of the University in China(No.NCET-13-0645)the Six Talent Plan(No.2015-XCL-030)Priority Academic Program Development of Jiangsu Higher Education Institutions。
文摘Lithium-sulfur batteries(LSBs)have received much concern as emerging high-power energy storage system.Nevertheless,the low conductivity of sulfur and poly sulfide shuttle results in low rate capability and rapid capacity decay,which seriously limit its commercial application.Here,facile,sustainable and cost-effective strategy for preparing heteroatom-doped porous activated carbon(PAC)derived from biomass palm kernel shell(PKS)was developed for high-performance LSB applications.The presence of N,P and S heteroatoms with modification of the surface polarity brings about large amounts of active sites and improved adsorption property compared to those of common carbon materials.The PAC sample possesses desirable specific surface area(SSA)(2760 m2·g-1)as well as pore volume(1.6 cm3·g-1).Besides,the good electrical conductivity of PAC endows the material with excellent rate performance.The PAC-S electrode with a 60%of sulfur loading has a desirable first discharge capacity(1045 mAh·g1,200 mA·g-1)with superb discharge capacity(869.8 mAh·g-1,100 th cycle)and cyclability(312.6 mAh·g-1,800 mA·g-1,1000 th cycle),which can be mainly ascribed to its unique porous properties and the good conductivity of PAC.
基金supported by the National Natural Science Foundation of China(NSFC-21671170,21673203, and 21201010)the Top-notch Academic Programs Project ofJiangsu Higher Education Institutions (TAPP)+3 种基金Program for New Century Excellent Talents of the University in China (NCET-130645)the Six Talent Plan (2015-XCL-030)Qinglan Projectthe Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Transition-metal selenides(M_xSe_y,M = Fe,Co,Ni)and their composites exhibit good storage capacities for sodium and lithium ions and occupy a unique position in research on sodium-ion and lithium-ion batteries.MxSey and their composites are used as active materials to improve catalytic activity.However,low electrical conductivity,poor cycle stability,and low rate performance severely limit their applications.This review provides a comprehensive introduction to and understanding of the current research progress of M_xSe_y and their composites.Moreover,this review proposes a broader research platform for these materials,including various bioelectrocatalytic performance tests,lithium-sulfur batteries,and fuel cells.The synthesis method and related mechanisms of M_xSe_y and their composites are reviewed,and the effects of material morphologies on their electrochemical performance are discussed.The advantages and disadvantages of M_xSe_y and their composites as well as possible strategies for improving the storage and conversion of electrochemical energy are also summarized.
基金the National Natural Science Foundation of China (Nos. 21202141, 21672163)Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)+3 种基金Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)the high level talent support project of Yangzhou University (top-notch talent, L. Yu)Yangzhou Natural Science Foundation (No. YZ2014040)the Natural Science Foundation of Guangling College (No. ZKZD17005) for financial support
文摘A synthetic method of dialkylideneacetones has been developed. Compared with known protocols, the method employed catalytic Ca(OH)_2 as the cheap, mild base catalyst and dilute aqueous EtOH(20%, v/v)as the green and safe solvent. The procedure was easily operated: In most cases, the product could be isolated by a simple filtration, and purified by washing with water. This paper provided experimental details of the reactions, which could be applied in gram-scale synthesis and should be a very reliable and practical protocol to prepare these useful compounds in laboratory and at the industrial level.
基金Project(2006CB605203) supported by National Basic Research Program of ChinaProject(2006AA03Z115) supported by the National High-tech Research and Development Program of ChinaProject(2006BAE04B09-4) supported by the National Key Technologies R&D Program of China during the 11th Five-Year Plan Period
文摘A self-developed taper barrel rheomoulding(TBR)machine was introduced,and the rheo-diecasting process was implemented by combining TBR machine with the high pressure die casting(HPDC)machine.Microstructural characteristics of the rheo-diecasting components were investigated at different rotation speeds.Flow characteristics and microstructural evolution of the semi-solid slurry during the rheo-diecasting process were analyzed and the mechanical properties of the rheo-diecasting components were studied.The experimental results show that the process is able to obtain such components in which the primaryα-Mg particles are fine,nearly spherical and uniformly distributed in the matrix.When the rotation speed of internal taper barrel is 700 r/min,the primaryα-Mg particles get a mean diameter of about 45μm and a shape factor of about 0.81.The magnesium alloy melt has complex stirring-fixed flow characteristics when flowing in TBR machine.Compared with conventional die-casing process,the rheo-diecasting process can improve the mechanical properties of components;especially,the elongation is improved by 80%.
基金Supported by Fund Project of Hubei Agricultural Science and Technology Innovation Center(2007-620-003-03-05)
文摘This paper first analyzes the important role of Nanfan Base in China: " accelerator" for breeding new varieties of crops; " unallocated store" to ensure the varieties for agricultural production; " lightning rod" to ensure the quality and safety of seeds; " big stage" for variety and technical exchanges and cooperation; " big school" for cultivating seed industry technology talents; " booster" for promoting local economic development. Then it points out the main problems about Nanfan Base and finally sets forth the relevant recommendations.
基金supported by National Key Research and Development Program of China (No. 2018YFD0200100)Natural Science Foundation of Guangling College (Key Project: No. ZKZD17005+4 种基金 major special project: No. ZKZZ18001)Natural Science Foundation of Jiangsu Province (No. BK20181449)Jiangsu Provincial Six Talent Peaks Project (No. XCL-090)Opening Foundation of the Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University (No. 2016GDGP0104)Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
文摘Deoximation reaction is one of the most important transformations in organic synthesis and for fine chemical production.Since oximes are easily synthesized from carbonyl compounds and are stable compounds,this reaction can be used for protection-deprotection,purification,and characterization of carbonyl compounds in organic synthesis,especially for the synthesis of medicines as well as the natural products.Moreover,because many oximes can be synthesized from non-carbonyl starting materials,the deoximation reaction is also widely used in the production of many carbonyl-contained fine chemicals.Deoximation methods by using stoichiometric reagents are mature and can produce the related carbonyl products in very high yield with broad substrate application scopes.But for environment-protection consideration as well as the production cost controlling purpose in fine chemical industry,developing catalytic deoximation methods is the trend of the field and there are a series of references on this topic in recent years.This short review summarized recent advances on the development of deoximation methods from stoichiometric reaction to catalytic reaction and the mechanisms of some important transformations were discussed in detail for reader reference.
基金the Natural Science Foundation of China(31801269,31971810)the Natural Science Foundation of Jiangsu Province(BK20180275)+1 种基金the China Postdoctoral Science Foundation(2018M642332)A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)。
文摘Low temperature in early spring impairs wheat growth and grain yield.However,little is known about the cytological and molecular mechanisms underlying low temperature regulation of wheat spike development.Microstructure observation and transcriptome sequencing of wheat spikes under low temperature were conducted.Low temperature slowed spike development,reduced the yield-component parameters of wheat spikes at the harvest stage,delayed the formation of lateral spikelets and tissue development,and induced the early differentiation of terminal spikelets.Low temperature increased the content of abscisic acid and caused the upregulation of genes in the abscisic acid signaling pathway,including those encoding PP2 Cs,Sn RK2 s,and b ZIP transcription factors.Low temperature also induced the upregulation of 33 cold-responsive genes involved in wheat response to low-temperature stress and regulation of abscisic acid biosynthesis and metabolism of other substances.The wheat spike adapted to cold conditions by changing the expression levels of genes involved in spike morphogenesis,including the transcription-factor genes MADS6,ERF4,ERF78,WOX6,and NAC48.These findings suggest that low temperature in early spring delays wheat spike development by increasing abscisic acid content or affecting the expression of genes involved in morphogenesis.
基金National Key Research and Development Program of China(No.2018YFD0200100)Natural Science Foundation of Jiangsu Province(No.BK20181449)+3 种基金Jiangsu Provincial Six Talent Peaks Project(No.XCL-090)Natural Science Foundation of Guangling College(Key Project:No.ZKZD17005Major Special Project:No.ZKZZ18001)Priority Academic Program Development of Jiangsu Higher Education Institutions for support。
文摘Selenization of Fe2O3 with NaHSe led to Se/Fe3O4.The unexpected generation of Fe3O4 attributed to the reduction conditions of the reaction,and the resulted magnetic features of the material facilitated its separation in practical applications.Owning to the synergistic effect of Se with Fe,the material was especially active to catalyze the oxidative C=C scission using O2 as mild oxidant.The technique has been successfully applied in polyene degradation project,which is of profound practical values for the treatment of the polyene pigment pollution and may be applied in the food and pha rmaceutical industry.
基金financially supported by the National Natural Science Foundation of China (No. 51602281)the China Postdoctoral Science Foundation (No. 2017M621832)+3 种基金the Science and Technology Innovation Cultivation Fund project of Yangzhou University (No. 2019CXJ092)the project of national local joint engineering laboratory to functional adsorption material technology for the environmental protection, Soochow University (No. SDGC2124)Yangzhou University High-end Talent Support Programthe “Qinglan Project” of Jiangsu Universities
文摘In this work,a high-efficiency photocatalytic BiOCl material with a visible light absorption range was successfully prepared by one-pot molecular self-assembly and particle recrystallization method at room temperature.In the process of crystal growth,tartaric acid,as a structure control agent,gradually transforms the stacked two-dimensional nano-sheet-like BiOCl into a hierarchical structure composed of petallike nano-sheets through hydrogen bonding.Besides,the acid etching of organic carboxylic acid on the crystal surface increases the number of micropores and mesopores,thereby the reaction interface.The thiourea(TU)molecules adsorbed on the BiOCl surface with a strong electronic effect introduce oxygen vacancies(OVs)under the condition of low oxygen content.The synergistic effect of hierarchical structure and OVs reduces the recombination of photogenerated carriers,but absorbs more O_(2)and OH−to generate a large number of superoxide radicals(·O_(2)−)and hydroxyl radicals(·OH)effectively.The photocatalytic performance of the synthesized BiOCl material has been significantly improved,and it can effectively degrade 94.15%of rhodamine B(RhB)within 20 min.Furthermore,90.95%of tetracycline(TC),93.76%of ciprofloxacin(CIP),and 85.53%of methyl orange(MO)can be removed in 80 min.Therefore,our work provides an effective method for preparing BiOCl with visible light catalytic activity,which,of course,can be used to treat and repair actual environmental problems under mild conditions.
基金supported by the National Key Research and Development Program of China(2016YFC0501203)the National Genetically Modified Organism Project(2016ZX08010005-9)。
文摘Plant mitochondrial phosphate transporters regulate phosphate transport and ATP synthesis. Determining whether they function in abiotic stress response process would shed light on their response to salt stress. We used the CRISPR/Cas9 gene-editing system to mutagenize two mitochondrial phosphate transporters, OsMPT3;1 and OsMPT3;2, to investigate their regulatory roles under salt stress. Two cas9(CRISPR-associated protein9)-free homozygous mutants, mpt33 and mpt30, were confirmed to be stable. Both OsMPT3;1 and OsMPT3;2 were markedly induced by salt stress, and their mutagenesis strongly inhibited growth and development, especially under salt stress. Mutagenesis sharply reduced the accumulation of ATP, phosphate, calcium, soluble sugar, and proline and increased osmotic potential, malondialdehyde, and Na^+ /K^+ ratio under salt stress. Both mutants demonstrate normal growth and development in the presence of ATP, revealing high sensitivity to exogenous ATP under salt stress. The mutants showed lowered rates of Na^+ efflux but also of K^+ and Ca^(2+) influx under salt stress. Mutagenesis of OsMPT3;2 altered the enrichment profiles of differentially expressed genes involved mainly in synthesis of secondary metabolites, metabolism of glycolysis, pyruvate, tricarboxylic acid cycle, in response to salt stress. The mutant displayed significant accumulation differences in 14 metabolites involved in 17 metabolic pathways, and strongly up-regulated the accumulation of glutamine, a precursor in proline synthesis, under salt stress. These findings suggest that the OsMPT3 gene modulates phosphate transport and energy supply for ATP synthesis and triggers changes in accumulation of ions and metabolites participating in osmotic regulation in rice under salt stress, thus increasing rice salt tolerance. This study demonstrates the effective application of CRISPR/Cas9 gene-editing to the investigation of plant functional genes.
基金supported by the National Natural Science Foundation of China(NSFC,Nos.21671170,21673203, 21201010)the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP)+2 种基金Program for New Century Excellent Talents of the University in China(NCET,No.13-0645)Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.XSJCX17-015)the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘Silicon(Si) materials as anode materials for applications in lithium-ion batteries(LIBs) have received increasing attention.Among the Si materials,the electrochemical properties of SiOx-based(0<x≤2)composites are the most prominent.However,due to the cycling stability of SiOx being far from practical,there are some problems,such as Iow initial coulombic efficiency(ICE),obvious volume expansion and poor conductivity.Researchers in various countries have optimized the electrochemical properties of SiOx-based composites by means of pore formation,surface modification,and the choice of constituents.In this review,SiOx-based composites are classified into three categories based on the valency of Si(SiO2 composites,SiO composites and SiOx(0<x<2) composites).The synthesis,morphologies and electrochemical properties of the SiOx-based composites that are applied in LIB are discussed.Finally,the prope rties of several common SiOx-based composites are briefly compared and the challenges faced by SiOx-based composites are highlight.
