In this work,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts were successfully in-situ prepared by treating of BiPO_(4)with dilute hydrochloric acid(HCl)under hydrothermal condition.Systematically characterization res...In this work,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts were successfully in-situ prepared by treating of BiPO_(4)with dilute hydrochloric acid(HCl)under hydrothermal condition.Systematically characterization results confirm that BiOCl/BiPO_(4)heterojunctions have been successfully in-situ constructed and oxygen vacancies(OVs)are significantly increased.The OVs on the surface of the BiOCl/OVS-BiPO_(4)heterojunctions photocatalyst and the interface electric field at the interface of the heterojunctions effectively accelerate the separation and migration of photogenerated carriers,and the surface OVs provide more sites for adsorption and reaction.Consequently,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts have higher separation rate of photoexcited e-/h+pairs and exhibit ascendant photocatalytic degradation activity.Electron paramagnetic resonance(EPR)technology and free radical capture experiments give strong evidence that·O2-exists in the reaction system and is the leading species during the degradation process.The experimental results reveal that the degradation efficiency of rhodamine B(RhB)over BiPO_(4)treated with 3 ml of 0.1%dilute hydrochloric acid(3HCl-BPO)is 2.42 times of that over the reference BiPO_(4).After ultraviolet(UV)light illumination for 20 min,the destruction degree of RhB on the 3HCl-BPO sample reaches 99%.Moreover,the degradation rate of tetracycline(TC)is also obviously improved over 3HCl-BPO compared with that on the reference BiPO_(4)after 40 min exposure to ultraviolet light.The excellent stability of the sample was demonstrated by five cycles.A reasonable enhancement mechanism for BiOCl/OVs-BiPO_(4)heterojunctions was proposed to elucidate the boosted photocatalytic performance.This work offers a facile and reliable reference to design high performance BiPO_(4)-based photocatalysts for environment purification.展开更多
Layered double hydroxide(LDH)with special layered structure has been proved to have excellent hole transport capacity and good stability.Herein,we report a high efficient composite photocatalyst of CoAlLDH and BiPO4pr...Layered double hydroxide(LDH)with special layered structure has been proved to have excellent hole transport capacity and good stability.Herein,we report a high efficient composite photocatalyst of CoAlLDH and BiPO4prepared by hydrothermal and che mical adsorption(denoted as CoAl-LDH/BiPO_(4)).Phenol can be entirely degraded by 1%CoAl-LDH/BiPO_(4)under 30 min ultraviolet(UV)light irradiation,and the degradation rate constants k are 3 times and 39 times higher than that of pure BiPO_(4)and CoAl-LDH,respectively.The enhanced photocatalytic activity can be attributed to effective holes transfer from BiPO4to CoAl-LDH,which hinders the recombination of photo genera ted charge carriers.In addition,the combination of BiPO4and CoAl-LDH avoids the agglomeration of BiPO4and improves the stability of BiPO_(4).Active species capture experiments indicate that superoxide radicals(·O-_(2))are the main active species responsible for the degradation of phenol.This work provides technical approaches and research ideas for solving the photogenerated charge carrier recombination problem of photocatalyst.展开更多
Defect engineering has been demonstrated to be an appealing strategy to boost the photocatalytic activity of materials.However,can higher defect concentration bring about higher photocatalytic activity?This is an open...Defect engineering has been demonstrated to be an appealing strategy to boost the photocatalytic activity of materials.However,can higher defect concentration bring about higher photocatalytic activity?This is an open question.In this work,BiPO_(4)photocatalysts with controllable oxygen vacancy concentrations were successfully synthesized.The photocatalytic activity of the obtained BiPO_(4)photocatalysts was determined by the removal of ciprofloxacin and 4-chlorophenol,as well as CO_(2)photoreduction.The BiPO4materials with lower oxygen vacancy concentration could display unexpected higher photocatalytic efficiency.Through the investigation of different factors which may affect the photocatalytic performance,such as crystal structure,morphology,specific surface area,defect,and energy band structure,it can be found that the energy band structure difference was responsible for the enhanced photocatalytic activity.展开更多
In this perspective,we have highlighted the current literature and explained the synthesis,structure,morphology,modification strategies,and photocatalytic applications of emerging BiPO_(4)-based photocatalysts.Since B...In this perspective,we have highlighted the current literature and explained the synthesis,structure,morphology,modification strategies,and photocatalytic applications of emerging BiPO_(4)-based photocatalysts.Since BiPO_(4)is a large bandgap photocatalyst,it uses UV light for the excitation of electrons,and also,the recombination of charge carriers is an issue in BiPO_(4).Various novel modification strategies of BiPO_(4)photocatalysts viz.defect modifications,heterojunction formation,phase-junctions,surface plasmon resonance,Schottky junction have been successfully proposed and highlighted.These modifications enhance the light absorption and inhibit the recombination of charge carriers BiPO_(4)photocatalyst.Finally,future aspects for further research on BiPO_(4)-based photocatalysts are also explored.It expects that BiPO_(4)-based photocatalysts represent a promising strategy for developing practical photocatalysts for energy and environmental remediation applications.展开更多
As a new type of semiconductor,Bi-based photocatalysts have attracted widespread attention in the field of environmental pollution control.In this study,a ternary BiPO_(4)/BiOIO_(3)/PI composite was prepared using a f...As a new type of semiconductor,Bi-based photocatalysts have attracted widespread attention in the field of environmental pollution control.In this study,a ternary BiPO_(4)/BiOIO_(3)/PI composite was prepared using a facile hydrothermal process and ultrasonic-assisted deposition method.The Fourier transform infrared spectra(FT-IR),X-ray powder diffraction(XRD),scanning electron microscopy(SEM),and UV-Vis diffused reflection spectra(UV-Vis DRS)were employed to determine the morphology and structure of the as-obtained BiPO_(4)/BiOIO_(3)/PI composite.The photocatalytic performance of the as-prepared BiPO_(4)/BiOIO_(3)/PI was evaluated via the degradation of dyes such as rhodamine B(RhB),methyl orange(MO),and methylene blue(MB)in aqueous solution.It was found that 99.6% of RhB,92.7% of MO,and 87.5%of MB were degraded,within 15 min of simulated solar irradiation over the BiPO_(4)/BiOIO_(3)/PI composite,showing the remarkably high photocatalytic activity of the BiPO_(4)/BiOIO_(3)/PI ternary photocatalyst.The results of trapping experiments displayed that photogenerated holes and superoxide radicals were the main active species in the photocatalytic process.The obvious enhancement of photocatalytic activity could be mainly ascribed to enhancing the separation and migration of photogenerated charge carriers in the BiPO_(4)/BiOIO_(3)/PI composite.展开更多
基金supported by Sichuan University of Science and Engineering(No.2021RC26)Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province(No.CSPC202105).
文摘In this work,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts were successfully in-situ prepared by treating of BiPO_(4)with dilute hydrochloric acid(HCl)under hydrothermal condition.Systematically characterization results confirm that BiOCl/BiPO_(4)heterojunctions have been successfully in-situ constructed and oxygen vacancies(OVs)are significantly increased.The OVs on the surface of the BiOCl/OVS-BiPO_(4)heterojunctions photocatalyst and the interface electric field at the interface of the heterojunctions effectively accelerate the separation and migration of photogenerated carriers,and the surface OVs provide more sites for adsorption and reaction.Consequently,BiOCl/OVs-BiPO_(4)heterojunction photocatalysts have higher separation rate of photoexcited e-/h+pairs and exhibit ascendant photocatalytic degradation activity.Electron paramagnetic resonance(EPR)technology and free radical capture experiments give strong evidence that·O2-exists in the reaction system and is the leading species during the degradation process.The experimental results reveal that the degradation efficiency of rhodamine B(RhB)over BiPO_(4)treated with 3 ml of 0.1%dilute hydrochloric acid(3HCl-BPO)is 2.42 times of that over the reference BiPO_(4).After ultraviolet(UV)light illumination for 20 min,the destruction degree of RhB on the 3HCl-BPO sample reaches 99%.Moreover,the degradation rate of tetracycline(TC)is also obviously improved over 3HCl-BPO compared with that on the reference BiPO_(4)after 40 min exposure to ultraviolet light.The excellent stability of the sample was demonstrated by five cycles.A reasonable enhancement mechanism for BiOCl/OVs-BiPO_(4)heterojunctions was proposed to elucidate the boosted photocatalytic performance.This work offers a facile and reliable reference to design high performance BiPO_(4)-based photocatalysts for environment purification.
基金supported by the National Key Research and Development Program of China [2019YFC1904500]National Natural Science Foundation of China [52270115, 21878331, 21777080]Science Foundation of China University of Petroleum, Beijing [2462019QNXZ05, 2462020YXZZ018]
文摘Layered double hydroxide(LDH)with special layered structure has been proved to have excellent hole transport capacity and good stability.Herein,we report a high efficient composite photocatalyst of CoAlLDH and BiPO4prepared by hydrothermal and che mical adsorption(denoted as CoAl-LDH/BiPO_(4)).Phenol can be entirely degraded by 1%CoAl-LDH/BiPO_(4)under 30 min ultraviolet(UV)light irradiation,and the degradation rate constants k are 3 times and 39 times higher than that of pure BiPO_(4)and CoAl-LDH,respectively.The enhanced photocatalytic activity can be attributed to effective holes transfer from BiPO4to CoAl-LDH,which hinders the recombination of photo genera ted charge carriers.In addition,the combination of BiPO4and CoAl-LDH avoids the agglomeration of BiPO4and improves the stability of BiPO_(4).Active species capture experiments indicate that superoxide radicals(·O-_(2))are the main active species responsible for the degradation of phenol.This work provides technical approaches and research ideas for solving the photogenerated charge carrier recombination problem of photocatalyst.
基金financially supported by the National Natural Science Foundation of China(No.22002014)the Funding for scientific research startup of Jiangsu University(No.20JDG15)+1 种基金Fundamental Research Funds for the Central Universities(No.30922010302)Start-Up Grant(No.AE89991/397)from Nanjing University of Science and Technology。
文摘Defect engineering has been demonstrated to be an appealing strategy to boost the photocatalytic activity of materials.However,can higher defect concentration bring about higher photocatalytic activity?This is an open question.In this work,BiPO_(4)photocatalysts with controllable oxygen vacancy concentrations were successfully synthesized.The photocatalytic activity of the obtained BiPO_(4)photocatalysts was determined by the removal of ciprofloxacin and 4-chlorophenol,as well as CO_(2)photoreduction.The BiPO4materials with lower oxygen vacancy concentration could display unexpected higher photocatalytic efficiency.Through the investigation of different factors which may affect the photocatalytic performance,such as crystal structure,morphology,specific surface area,defect,and energy band structure,it can be found that the energy band structure difference was responsible for the enhanced photocatalytic activity.
基金supported by Brain Pool Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(no.2020H1D3A1A04081409)。
文摘In this perspective,we have highlighted the current literature and explained the synthesis,structure,morphology,modification strategies,and photocatalytic applications of emerging BiPO_(4)-based photocatalysts.Since BiPO_(4)is a large bandgap photocatalyst,it uses UV light for the excitation of electrons,and also,the recombination of charge carriers is an issue in BiPO_(4).Various novel modification strategies of BiPO_(4)photocatalysts viz.defect modifications,heterojunction formation,phase-junctions,surface plasmon resonance,Schottky junction have been successfully proposed and highlighted.These modifications enhance the light absorption and inhibit the recombination of charge carriers BiPO_(4)photocatalyst.Finally,future aspects for further research on BiPO_(4)-based photocatalysts are also explored.It expects that BiPO_(4)-based photocatalysts represent a promising strategy for developing practical photocatalysts for energy and environmental remediation applications.
基金supported by the Fundamental Research Funds of China West Normal University(19D038,24kx004)the Opening Project of the Key Laboratory of Green Catalysis of Higher Education Institutes of Sichuan(LZJ2101).
文摘As a new type of semiconductor,Bi-based photocatalysts have attracted widespread attention in the field of environmental pollution control.In this study,a ternary BiPO_(4)/BiOIO_(3)/PI composite was prepared using a facile hydrothermal process and ultrasonic-assisted deposition method.The Fourier transform infrared spectra(FT-IR),X-ray powder diffraction(XRD),scanning electron microscopy(SEM),and UV-Vis diffused reflection spectra(UV-Vis DRS)were employed to determine the morphology and structure of the as-obtained BiPO_(4)/BiOIO_(3)/PI composite.The photocatalytic performance of the as-prepared BiPO_(4)/BiOIO_(3)/PI was evaluated via the degradation of dyes such as rhodamine B(RhB),methyl orange(MO),and methylene blue(MB)in aqueous solution.It was found that 99.6% of RhB,92.7% of MO,and 87.5%of MB were degraded,within 15 min of simulated solar irradiation over the BiPO_(4)/BiOIO_(3)/PI composite,showing the remarkably high photocatalytic activity of the BiPO_(4)/BiOIO_(3)/PI ternary photocatalyst.The results of trapping experiments displayed that photogenerated holes and superoxide radicals were the main active species in the photocatalytic process.The obvious enhancement of photocatalytic activity could be mainly ascribed to enhancing the separation and migration of photogenerated charge carriers in the BiPO_(4)/BiOIO_(3)/PI composite.
