The magnetic iron oxide（Fe3O4） nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe（II）-loaded hydrophyte biomass under N2 conditions. The batch experiments showed that magnetic biochar...The magnetic iron oxide（Fe3O4） nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe（II）-loaded hydrophyte biomass under N2 conditions. The batch experiments showed that magnetic biochar presented a large removal capacity（54.35 mg/g）at pH 3.0 and 293 K. The reductive co-precipitation of U（VI） to U（IV） by magnetic biochar was demonstrated according to X-ray diffraction, X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis. According to extended X-ray absorption fine structure analysis, the occurrence of U-Fe and U-U shells indicated that high effective removal of uranium was primarily inner-sphere coordination and then reductive co-precipitation at low pH. These observations provided the further understanding of uranium removal by magnetic materials in environmental remediation.展开更多
During wet complexation denitrification of flue gas,Fe^(Ⅱ)EDTA regeneration,also known as reducing Fe^(Ⅱ)EDTA and Fe^(Ⅱ)EDTA-nitric oxide(NO)to Fe^(Ⅱ)EDTA,is crucial.In this paper,ultraviolet(UV)light was used for...During wet complexation denitrification of flue gas,Fe^(Ⅱ)EDTA regeneration,also known as reducing Fe^(Ⅱ)EDTA and Fe^(Ⅱ)EDTA-nitric oxide(NO)to Fe^(Ⅱ)EDTA,is crucial.In this paper,ultraviolet(UV)light was used for the first time to reduce Fe^(Ⅱ)EDTA-NO.The experimental result demonstrated that Fe^(Ⅱ)EDTA-NO reduction rate increased with UV power increasing,elevated temperature,and initial Fe^(Ⅱ)EDTA-NO concentration decreasing.Fe^(Ⅱ)EDTA-NO reduction rate increased first and then decreased as pH value increased(2.0-10.0).Fe^(Ⅱ)EDTA-NO reduction with UV irradiation presented a first order reaction with respect to Fe^(Ⅱ)EDTA-NO.Compared with other Fe^(Ⅱ)EDTA regeneration methods,Fe^(Ⅱ)EDTA regeneration with UV show more superiority through comprehensive consideration of regeneration rate and procedure.Subsequently,NO absorption experiment by Fe^(Ⅱ)EDTA solution with UV irradiation confirmed that UV can significantly promote the NO removal performance of Fe^(Ⅱ)EDTA.Appropriate oxygen concentration(3%(vol))and acidic environment(pH=4)was favorable for NO removal.With UV power increasing as well as temperature decreasing,NO removal efficiency rose.In addition,the mechanism research indicates that NO from flue gas is mostly converted to NO_(2)-,NO_(3)-,NH_(4)^(+),N_(2),and N_(2)O with Fe^(Ⅱ)EDTA absorption liquid with UV irradiation.UV strengthens NO removal in Fe^(Ⅱ)EDTA absorption liquid by forming a synergistic effect of oxidation-reduction-complexation.Finally,compared with NO removal methods with Fe^(Ⅱ)EDTA,Fe^(Ⅱ)EDTA combined UV system shows prominent technology advantage in terms of economy and secondary pollution.展开更多
The development of sweet potato industry in Fuyang City takes on following characteristics:increase in planting area of specialized households and professional cooperatives;increase in production input and yield;const...The development of sweet potato industry in Fuyang City takes on following characteristics:increase in planting area of specialized households and professional cooperatives;increase in production input and yield;constant optimization of planting varieties;diversified planting modes.Sweet potato industry has made significant contribution to Fuyang City:(1)enriching types of agricultural products and promoting healthy diet;(2)driving development of agricultural product processing industry and increasing the employment rate of rural labor;(3)increasing financial revenue and rate of export-making foreign exchange of agricultural products;(4)increasing farmers'income and promoting new socialist countryside construction.In line with comparative advantages and existing problems of sweet potato industry in Fuyang City,it presents corresponding industrial development recommendations.展开更多
Multicolor photodetection,essential for applications in infrared imaging,environ-mental monitoring,and spectral analysis,is often limited by the narrow bandgaps of conventional materials,which struggle with speed,sens...Multicolor photodetection,essential for applications in infrared imaging,environ-mental monitoring,and spectral analysis,is often limited by the narrow bandgaps of conventional materials,which struggle with speed,sensitivity,and room-temperature operation.We address these issues with a multicolor uncooled photo-detector based on an asymmetric Au/SnS/Gr vertical heterojunction with inversion-symmetry breaking.This design utilizes the complementary bandgaps of SnS and graphene to enhance the efficiency of carriers'transport through consis-tently oriented built-in electric fields,achieving significant advancements in direc-tional photoresponse.The device demonstrates highly sensitive photoelectric detection performance,such as a responsivity(R)of 55.4–89.7 A W^(–1)with rapid response times of approximately 104μs,and exceptional detectivity(D^(*))of 2.38×10^(10)Jones-8.19×10^(13)Jones from visible(520 nm)to infrared(2000 nm)light,making it suitable for applications demanding an imaging resolution of-0.5 mm.Additionally,the comparative analysis reveals that the asymmetric ver-tical heterojunction outperforms its counterparts,exhibiting approximately 9-fold the photoresponse of symmetric vertical heterojunction and almost 100-fold that of symmetric horizontal heterojunction.This highly sensitive multicolor detector holds significant promise for applications in advanced versatile object detection and imaging recognition systems.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 21207092, 21577093)the Science and Technology Project of Shaoxing (No. 2014B70041)
文摘The magnetic iron oxide（Fe3O4） nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe（II）-loaded hydrophyte biomass under N2 conditions. The batch experiments showed that magnetic biochar presented a large removal capacity（54.35 mg/g）at pH 3.0 and 293 K. The reductive co-precipitation of U（VI） to U（IV） by magnetic biochar was demonstrated according to X-ray diffraction, X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis. According to extended X-ray absorption fine structure analysis, the occurrence of U-Fe and U-U shells indicated that high effective removal of uranium was primarily inner-sphere coordination and then reductive co-precipitation at low pH. These observations provided the further understanding of uranium removal by magnetic materials in environmental remediation.
基金supported by National Natural Science Foundation of China(52260012)Natural Science Foundation of Jiangxi Province(20232BAB203053,20212ACB213001,20232BAB203033)+1 种基金General Project of Jiangxi Province Key Research and Development Program(20192BBG70008)Training Plan for Academic and Technical Leaders of Major Disciplines in Jiangxi Province-youth Talent Project(20232BCJ23047).
文摘During wet complexation denitrification of flue gas,Fe^(Ⅱ)EDTA regeneration,also known as reducing Fe^(Ⅱ)EDTA and Fe^(Ⅱ)EDTA-nitric oxide(NO)to Fe^(Ⅱ)EDTA,is crucial.In this paper,ultraviolet(UV)light was used for the first time to reduce Fe^(Ⅱ)EDTA-NO.The experimental result demonstrated that Fe^(Ⅱ)EDTA-NO reduction rate increased with UV power increasing,elevated temperature,and initial Fe^(Ⅱ)EDTA-NO concentration decreasing.Fe^(Ⅱ)EDTA-NO reduction rate increased first and then decreased as pH value increased(2.0-10.0).Fe^(Ⅱ)EDTA-NO reduction with UV irradiation presented a first order reaction with respect to Fe^(Ⅱ)EDTA-NO.Compared with other Fe^(Ⅱ)EDTA regeneration methods,Fe^(Ⅱ)EDTA regeneration with UV show more superiority through comprehensive consideration of regeneration rate and procedure.Subsequently,NO absorption experiment by Fe^(Ⅱ)EDTA solution with UV irradiation confirmed that UV can significantly promote the NO removal performance of Fe^(Ⅱ)EDTA.Appropriate oxygen concentration(3%(vol))and acidic environment(pH=4)was favorable for NO removal.With UV power increasing as well as temperature decreasing,NO removal efficiency rose.In addition,the mechanism research indicates that NO from flue gas is mostly converted to NO_(2)-,NO_(3)-,NH_(4)^(+),N_(2),and N_(2)O with Fe^(Ⅱ)EDTA absorption liquid with UV irradiation.UV strengthens NO removal in Fe^(Ⅱ)EDTA absorption liquid by forming a synergistic effect of oxidation-reduction-complexation.Finally,compared with NO removal methods with Fe^(Ⅱ)EDTA,Fe^(Ⅱ)EDTA combined UV system shows prominent technology advantage in terms of economy and secondary pollution.
基金the Earmarked Fund for Modern Agro-industry Technology Re-search System(CARS-11)
文摘The development of sweet potato industry in Fuyang City takes on following characteristics:increase in planting area of specialized households and professional cooperatives;increase in production input and yield;constant optimization of planting varieties;diversified planting modes.Sweet potato industry has made significant contribution to Fuyang City:(1)enriching types of agricultural products and promoting healthy diet;(2)driving development of agricultural product processing industry and increasing the employment rate of rural labor;(3)increasing financial revenue and rate of export-making foreign exchange of agricultural products;(4)increasing farmers'income and promoting new socialist countryside construction.In line with comparative advantages and existing problems of sweet potato industry in Fuyang City,it presents corresponding industrial development recommendations.
基金National Key Research and Development Program of China,Grant/Award Number:2023YFA1406900Strategic Priority Research Program(B)of Chinese Academy of Sciences,Grant/Award Numbers:XDB0580000,GJ0090406,XDB43010200+7 种基金National Natural Science Foundation of China,Grant/Award Numbers:62222514,62350073,U2341226,61991440,91850208,62204249,62005249Youth Innovation Promotion Association of Chinese Academy of Sciences,Grant/Award Number:Y2021070Shanghai Science and Technology Committee,Grant/Award Numbers:23ZR1482000,22JC1402900Shanghai Municipal Science and Technology Major Project,Grant/Award Number:2019SHZDZX01Open Fund of State Key Laboratory of Infrared Physics,Grant/Award Number:SITP-NLIST-YB-2023-13Natural Science Foundation of Zhejiang Province,Grant/Award Numbers:LZ24F050006,LQ20F050005,LR22F050004Excellent Postdoctoral Research Projects of Zhejiang Province,Grant/Award Number:ZJ2021019Research Funds of Hangzhou Institute for Advanced Study,UCAS,Grant/Award Numbers:B02006C019025,B02006C021010。
文摘Multicolor photodetection,essential for applications in infrared imaging,environ-mental monitoring,and spectral analysis,is often limited by the narrow bandgaps of conventional materials,which struggle with speed,sensitivity,and room-temperature operation.We address these issues with a multicolor uncooled photo-detector based on an asymmetric Au/SnS/Gr vertical heterojunction with inversion-symmetry breaking.This design utilizes the complementary bandgaps of SnS and graphene to enhance the efficiency of carriers'transport through consis-tently oriented built-in electric fields,achieving significant advancements in direc-tional photoresponse.The device demonstrates highly sensitive photoelectric detection performance,such as a responsivity(R)of 55.4–89.7 A W^(–1)with rapid response times of approximately 104μs,and exceptional detectivity(D^(*))of 2.38×10^(10)Jones-8.19×10^(13)Jones from visible(520 nm)to infrared(2000 nm)light,making it suitable for applications demanding an imaging resolution of-0.5 mm.Additionally,the comparative analysis reveals that the asymmetric ver-tical heterojunction outperforms its counterparts,exhibiting approximately 9-fold the photoresponse of symmetric vertical heterojunction and almost 100-fold that of symmetric horizontal heterojunction.This highly sensitive multicolor detector holds significant promise for applications in advanced versatile object detection and imaging recognition systems.
