Discovering highly selective catalysts is key to achieve effective CO_(2) photoreduction to hydrocarbon fuels.In this work,we construct an ultrathin dimension-matched S-scheme Bi_(3)NbO_(7)/g-C_(3)N_(4) heterostructur...Discovering highly selective catalysts is key to achieve effective CO_(2) photoreduction to hydrocarbon fuels.In this work,we construct an ultrathin dimension-matched S-scheme Bi_(3)NbO_(7)/g-C_(3)N_(4) heterostructure,which permits the highly selective photocatalytic reduction of CO_(2) to CH_(4),as shown by 13C isotopic measurements.Density functional theory calculations combined with solid-state characterization confirm the electron transfer from g-C_(3)N_(4) nanosheets to Bi_(3)NbO_(7),establishing an internal electric field.The internal electric field drives photogenerated electrons from Bi_(3)NbO_(7) to g-C_(3)N_(4),as revealed by in-situ X-ray photoelectron spectroscopy,demonstrating the presence of an S-scheme charge transfer path in Bi_(3)NbO_(7)/g-C_(3)N_(4) heterostructures allowing efficient and selective CO2 photoreduction.As a result,the optimized sample achieved a CH_(4) evolution rate of 37.59μmol·g^(-1)·h^(-1),a ca.15-fold enhancement compared to ultrathin g-C_(3)N_(4) nanosheets,and also retained stability after 10 reaction cycles and 40 h of simulated solar irradiation with no sacrificial reagents.The optimized Bi3 Nb O7/g-C_(3)N_(4) composites achieve almost 90%selectivity for CH_(4) production over CO.展开更多
Due to the low content of adsorption-active groups in lignin,its application in the field of adsorption is limited.Herein,we first prepared cationic kraft lignin acrylate,from which a cationic lignin(CKLA)hydrogel was...Due to the low content of adsorption-active groups in lignin,its application in the field of adsorption is limited.Herein,we first prepared cationic kraft lignin acrylate,from which a cationic lignin(CKLA)hydrogel was further prepared by cationic kraft lignin acrylate,acrylamide,and N,N’-methylenebisacrylamide.The morphology,compression properties and swelling properties of CKLA hydrogels were investigated.The prepared CKLA hydrogel was applied as an adsorbent for Congo red.The effect of CKLA hydrogel dosages,initial concentration of Congo red,and pH on adsorption efficiency was investigated.The maximum Congo red removal efficiency was obtained at the initial concentration of Congo red of 50 mg/L,pH 7,and 5 mg dosage of CKLA hydrogel with 20%cationic lignin content.After five cycles of adsorption,the adsorption efficiency of the hydrogel for Congo red still reached more than 80%.The CKLA hydrogel showed pseudo-second-order adsorption kinetics for Congo red adsorption.These results demonstrate the potential of the CKLA hydrogel as an adsorbent for water treatment.展开更多
Bandgap engineering through single-atom site binding on semiconducting photocatalyst can boost the intrinsic activity,selectivity,carrier separation,and electron transport.Here,we report a mixed-valence Ag(0)and Ag(I)...Bandgap engineering through single-atom site binding on semiconducting photocatalyst can boost the intrinsic activity,selectivity,carrier separation,and electron transport.Here,we report a mixed-valence Ag(0)and Ag(I)single atoms co-decorated semiconducting chalcopyrite quantum dots(Ag/CuFeS_(2)QDs)photocatalyst.It demonstrates efficient photocatalytic performances for specific organic dye(rhodamine B,denoted as RhB)as well as inorganic dye(Cr(VI))removal in water under natural sunlight irradiation.The RhB degradation and Cr(VI)removal efficiencies by Ag/CuFeS_(2)QDs were 3.55 and 6.75 times higher than those of the naked CuFeS_(2)QDs at their optimal pH conditions,respectively.Besides,in a mixture of RhB and Cr(VI)solution under neutral condition,the removal ratio has been elevated from 30.2%to 79.4%for Cr(VI),and from 95.2%to 97.3%for RhB degradation by using Ag/CuFeS_(2)QDs after 2 h sunlight illumination.The intrinsic mechanism for the photocatalytic performance improvement is attributed to the narrow bandgap of the single-atomic Ag(I)anchored CuFeS_(2)QDs,which engineers the electronic structure as well as expands the optical light response range.Significantly,the highly active Ag(0)/CuFeS_(2)and Ag(I)/CuFeS_(2)effectively improve the separation efficiency of the carriers,thus enhancing the photocatalytic performances.This work presents a highly efficient single atom/QDs photocatalyst,constructed through bandgap engineering via mixed-valence single noble metal atoms binding on semiconducting QDs.It paves the way for developing high-efficiency single-atom photocatalysts for complex pollutions removal in dyeing wastewater environment.展开更多
Formaldehyde(FA),as an important chemical raw material,has been widely used in many fields.However,the discharge of a large amount of FA-containing wastewater poses a serious threat to the environment and human health...Formaldehyde(FA),as an important chemical raw material,has been widely used in many fields.However,the discharge of a large amount of FA-containing wastewater poses a serious threat to the environment and human health.Recently,the in-situ hydrogen energy release technology of hydrogen-containing stable liquid has been extensively explored due to its safe storage.Exploring a robust method to achieve FA removal and synchronous in-situ hydrogen release from FA containing wastewater is of great significant for environmental protection and energy crisis alleviation.Here,we have innovatively introduced peroxymonosulfate(PMS)activation technology into FA removal and hydrogen production simultaneously.The composite of nitrogen doped carbon coating Co_(9)S_(8)nanotubes(Co_(9)S_(8)@N-C)is employed as a proof of concept for FA decomposition and simultaneously hydrogen production based on PMS activation system.As expected,the Co_(9)S_(8)@N-C/PMS system presents much superior hydrogen production efficiency and satisfactory FA removal rate towards FA wastewater than those of common catalysis,photocatalysis and Fenton reaction in the basic condition in a wide range of FA concentration.The hydrogen yield reaches a value as high as 471μmol within 60 min,corresponding to a FA degradation rate of 30%with an initial FA concentration of 0.722 mol L^(-1).Characterizations and density functional theory(DFT)calculations suggest that the free radical process dominated by superoxide radical(O_(2)·^(-))and nonradical process dominated by singlet oxygen(^(1)O_(2)),which are induced by Co_(9)S_(8)@N-C/PMS system,are responsible for highly efficient hydrogen production via FA degradation.These generated O_(2)·^(-)and ^(1)O_(2)can extract·H from FA to form·OOH intermediate,which can further combine with the·H from water to produce hydrogen.This study provides an applicable technique for environmental purification and new energy development based on FA containing wastewater.展开更多
This article mainly introduces the innovative internship and training model of vocational colleges,including five aspects such as“four-party collaboration,three-stage progression,four-way integration,value-added eval...This article mainly introduces the innovative internship and training model of vocational colleges,including five aspects such as“four-party collaboration,three-stage progression,four-way integration,value-added evaluation,and double selection and promotion.”The model aims to improve students’practical skills and professional quality to better adapt to market demand and social development.The article also presents the prospects of the future internship and training model,including strengthening cooperation and communication with industry enterprises,focusing on students’personalized development and practical skill cultivation,and establishing a scientific and objective evaluation and feedback mechanism.展开更多
Red soil,the most critical soil resource in tropical/subtropical regions worldwide,faces tremendous threats,including nutrient deficiency,acidification,and heavy metal contamination.There is a great demand for multifu...Red soil,the most critical soil resource in tropical/subtropical regions worldwide,faces tremendous threats,including nutrient deficiency,acidification,and heavy metal contamination.There is a great demand for multifunctional eco-materials capable of modifying this situation.Herein,we used widely distributed soil and biomass to develop a zeolite/biochar composite for synergistic red soil remediation and amendment.With the composite material,the Pb^(2+) and Cd^(2+) remediation efficiencies reached 92.8%and 92.9%,respectively,in stems under optimal conditions.Moreover,the acidity and nutrient deficiency conditions of red soil significantly improved.The atomic-scale interaction mechanism during the remediation and amendment process was elucidated with complementary characterization methods,which revealed that in the zeolite/biochar composite material,zeolite contributes to longterm heavy metal remediation effects.Simultaneously,biochar is responsible for soil quality amendment and short-term heavy metal remediation.Furthermore,for the first time,single-atom heavy metal ions were observed on biochar during the remediation process,indicating the broad distribution of single atoms in the natural environment.展开更多
文摘Discovering highly selective catalysts is key to achieve effective CO_(2) photoreduction to hydrocarbon fuels.In this work,we construct an ultrathin dimension-matched S-scheme Bi_(3)NbO_(7)/g-C_(3)N_(4) heterostructure,which permits the highly selective photocatalytic reduction of CO_(2) to CH_(4),as shown by 13C isotopic measurements.Density functional theory calculations combined with solid-state characterization confirm the electron transfer from g-C_(3)N_(4) nanosheets to Bi_(3)NbO_(7),establishing an internal electric field.The internal electric field drives photogenerated electrons from Bi_(3)NbO_(7) to g-C_(3)N_(4),as revealed by in-situ X-ray photoelectron spectroscopy,demonstrating the presence of an S-scheme charge transfer path in Bi_(3)NbO_(7)/g-C_(3)N_(4) heterostructures allowing efficient and selective CO2 photoreduction.As a result,the optimized sample achieved a CH_(4) evolution rate of 37.59μmol·g^(-1)·h^(-1),a ca.15-fold enhancement compared to ultrathin g-C_(3)N_(4) nanosheets,and also retained stability after 10 reaction cycles and 40 h of simulated solar irradiation with no sacrificial reagents.The optimized Bi3 Nb O7/g-C_(3)N_(4) composites achieve almost 90%selectivity for CH_(4) production over CO.
基金supported by Fundamental Research Funds of CAF(CAFYBB2020MB002).
文摘Due to the low content of adsorption-active groups in lignin,its application in the field of adsorption is limited.Herein,we first prepared cationic kraft lignin acrylate,from which a cationic lignin(CKLA)hydrogel was further prepared by cationic kraft lignin acrylate,acrylamide,and N,N’-methylenebisacrylamide.The morphology,compression properties and swelling properties of CKLA hydrogels were investigated.The prepared CKLA hydrogel was applied as an adsorbent for Congo red.The effect of CKLA hydrogel dosages,initial concentration of Congo red,and pH on adsorption efficiency was investigated.The maximum Congo red removal efficiency was obtained at the initial concentration of Congo red of 50 mg/L,pH 7,and 5 mg dosage of CKLA hydrogel with 20%cationic lignin content.After five cycles of adsorption,the adsorption efficiency of the hydrogel for Congo red still reached more than 80%.The CKLA hydrogel showed pseudo-second-order adsorption kinetics for Congo red adsorption.These results demonstrate the potential of the CKLA hydrogel as an adsorbent for water treatment.
基金financially supported by the National Natural Science Foundation of China(Nos.21777045,61875119)Distinguished Young Scholar Fund from Natural Science Funds of Guangdong Province,China(No.2020B151502094)+1 种基金the program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning,Shanghai Rising-Star Program(No.19QA1404000)Shanghai Talent Development Fund.
文摘Bandgap engineering through single-atom site binding on semiconducting photocatalyst can boost the intrinsic activity,selectivity,carrier separation,and electron transport.Here,we report a mixed-valence Ag(0)and Ag(I)single atoms co-decorated semiconducting chalcopyrite quantum dots(Ag/CuFeS_(2)QDs)photocatalyst.It demonstrates efficient photocatalytic performances for specific organic dye(rhodamine B,denoted as RhB)as well as inorganic dye(Cr(VI))removal in water under natural sunlight irradiation.The RhB degradation and Cr(VI)removal efficiencies by Ag/CuFeS_(2)QDs were 3.55 and 6.75 times higher than those of the naked CuFeS_(2)QDs at their optimal pH conditions,respectively.Besides,in a mixture of RhB and Cr(VI)solution under neutral condition,the removal ratio has been elevated from 30.2%to 79.4%for Cr(VI),and from 95.2%to 97.3%for RhB degradation by using Ag/CuFeS_(2)QDs after 2 h sunlight illumination.The intrinsic mechanism for the photocatalytic performance improvement is attributed to the narrow bandgap of the single-atomic Ag(I)anchored CuFeS_(2)QDs,which engineers the electronic structure as well as expands the optical light response range.Significantly,the highly active Ag(0)/CuFeS_(2)and Ag(I)/CuFeS_(2)effectively improve the separation efficiency of the carriers,thus enhancing the photocatalytic performances.This work presents a highly efficient single atom/QDs photocatalyst,constructed through bandgap engineering via mixed-valence single noble metal atoms binding on semiconducting QDs.It paves the way for developing high-efficiency single-atom photocatalysts for complex pollutions removal in dyeing wastewater environment.
基金the National Natural Science Foundation of China(Nos.21975193 and 51602237)the Fundamental Research Funds for the Central Universities,China(WUT:2021Ⅲ034JC)。
文摘Formaldehyde(FA),as an important chemical raw material,has been widely used in many fields.However,the discharge of a large amount of FA-containing wastewater poses a serious threat to the environment and human health.Recently,the in-situ hydrogen energy release technology of hydrogen-containing stable liquid has been extensively explored due to its safe storage.Exploring a robust method to achieve FA removal and synchronous in-situ hydrogen release from FA containing wastewater is of great significant for environmental protection and energy crisis alleviation.Here,we have innovatively introduced peroxymonosulfate(PMS)activation technology into FA removal and hydrogen production simultaneously.The composite of nitrogen doped carbon coating Co_(9)S_(8)nanotubes(Co_(9)S_(8)@N-C)is employed as a proof of concept for FA decomposition and simultaneously hydrogen production based on PMS activation system.As expected,the Co_(9)S_(8)@N-C/PMS system presents much superior hydrogen production efficiency and satisfactory FA removal rate towards FA wastewater than those of common catalysis,photocatalysis and Fenton reaction in the basic condition in a wide range of FA concentration.The hydrogen yield reaches a value as high as 471μmol within 60 min,corresponding to a FA degradation rate of 30%with an initial FA concentration of 0.722 mol L^(-1).Characterizations and density functional theory(DFT)calculations suggest that the free radical process dominated by superoxide radical(O_(2)·^(-))and nonradical process dominated by singlet oxygen(^(1)O_(2)),which are induced by Co_(9)S_(8)@N-C/PMS system,are responsible for highly efficient hydrogen production via FA degradation.These generated O_(2)·^(-)and ^(1)O_(2)can extract·H from FA to form·OOH intermediate,which can further combine with the·H from water to produce hydrogen.This study provides an applicable technique for environmental purification and new energy development based on FA containing wastewater.
基金Special Project for Research on Vocational Education and Industrial Talent in Shandong Province in 2023:General Fund Project“Innovative Research on the‘Four-Way Integration,Three-Stage Progression,Four-Way Progression,Value-Added Evaluation,Double Selection and Promotion’Internship Training Mode Under the Reform of the Modern Vocational Education System Construction”(Project number:2023ZX058)。
文摘This article mainly introduces the innovative internship and training model of vocational colleges,including five aspects such as“four-party collaboration,three-stage progression,four-way integration,value-added evaluation,and double selection and promotion.”The model aims to improve students’practical skills and professional quality to better adapt to market demand and social development.The article also presents the prospects of the future internship and training model,including strengthening cooperation and communication with industry enterprises,focusing on students’personalized development and practical skill cultivation,and establishing a scientific and objective evaluation and feedback mechanism.
基金supported by the National Key Research and Development Program of China(No.2021YFA1202500)the Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control(No.2023B1212060002)+1 种基金the Stable Support Plan Program of Shenzhen Natural Science Foundation(No.20231122110855002)the High level of special funds(No.G03050K001)from SUSTech and a Special Fund for the Science and Technology Innovation Strategy of Guangdong Province(No.PDJH2021C0033).
文摘Red soil,the most critical soil resource in tropical/subtropical regions worldwide,faces tremendous threats,including nutrient deficiency,acidification,and heavy metal contamination.There is a great demand for multifunctional eco-materials capable of modifying this situation.Herein,we used widely distributed soil and biomass to develop a zeolite/biochar composite for synergistic red soil remediation and amendment.With the composite material,the Pb^(2+) and Cd^(2+) remediation efficiencies reached 92.8%and 92.9%,respectively,in stems under optimal conditions.Moreover,the acidity and nutrient deficiency conditions of red soil significantly improved.The atomic-scale interaction mechanism during the remediation and amendment process was elucidated with complementary characterization methods,which revealed that in the zeolite/biochar composite material,zeolite contributes to longterm heavy metal remediation effects.Simultaneously,biochar is responsible for soil quality amendment and short-term heavy metal remediation.Furthermore,for the first time,single-atom heavy metal ions were observed on biochar during the remediation process,indicating the broad distribution of single atoms in the natural environment.
