Peroxymonosulfate(PMS)is commonly used in advanced oxidation processes to degrade organic pollutants in wastewater.In this work,to obtain better PMS activation efficiency,Bi_(4)O_(5)Br_(2)/BCZT(BBT)piezoelectric photo...Peroxymonosulfate(PMS)is commonly used in advanced oxidation processes to degrade organic pollutants in wastewater.In this work,to obtain better PMS activation efficiency,Bi_(4)O_(5)Br_(2)/BCZT(BBT)piezoelectric photocatalyst was designed.Abundant active radicals produced by BBT under visible light irradiation and ultrasonic vibration were used to activate PMS,thereby achieving rapid degradation of high concentration pollutants.With the introduction of BCZT,the catalyst has a strong internal electric field and three-dimensional lamellar structure,which promotes the separation and transfer of electrons and holes.It is worth noting that under optimal reaction conditions,the degradation rate of ARB reached 93%by BBT15 within 10 min.The catalytic experiment combined with the piezoelectric performance test results revealed the key role of piezoelectric photocatalytic reaction in PMS activation.This provides an important prospect for PMS to effectively deal with the degradation of high concentrations of organic pollutants.展开更多
Bi12O17Br2and Bi4O5Br2visible‐light driven photocatalysts,were respectively fabricated by hydrothermal and room‐temperature deposition methods with the use of BiBr3and NaOH as precursors.Both Bi12O17Br2and Bi4O5Br2w...Bi12O17Br2and Bi4O5Br2visible‐light driven photocatalysts,were respectively fabricated by hydrothermal and room‐temperature deposition methods with the use of BiBr3and NaOH as precursors.Both Bi12O17Br2and Bi4O5Br2were composed of irregular nanosheets.The Bi4O5Br2nanosheets exhibited high and stable visible‐light photocatalytic efficiency for ppb‐level NO removal.The performance of Bi4O5Br2was markedly higher than that of the Bi12O17Br2nanosheets.The hydroxyl radical(?OH)was determined to be the main reactive oxygen species for the photo‐degradation processes of both Bi12O17Br2and Bi4O5Br2.However,in situ diffuse reflectance infrared Fourier transform spectroscopy analysis revealed that Bi12O17Br2and Bi4O5Br2featured different conversion pathways for visible light driven photocatalytic NO oxidation.The excellent photocatalytic activity of Bi4O5Br2resulted from a high surface area and large pore volumes,which facilitated the transport of reactants and intermediate products,and provided more active sites for photochemical reaction.Furthermore,the Bi4O5Br2nanosheets produced more?OH and presented stronger valence band holeoxidation.In addition,the oxygen atoms of NO could insert into oxygen‐vacancies of Bi4O5Br2,whichprovided more active sites for the reaction.This work gives insight into the photocatalytic pollutant‐degradation mechanism of bismuth oxyhalide.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51302061)Natural Science Foundation of Hebei Province(No.E2020201021 and E2023201019)+4 种基金Industry-University-Research Cooperation Major Projects of Shijiazhuang(No.241130477A)Research Innovation Team of College of Chemistry and Environmental Science of Hebei University(No.hxkytd2102)Industry-University-research Cooperation Project of Colleges and Universities in Hebei Province(No.CXZX2025016)Hebei Province Innovation Capability Enhancement Plan Project(No.22567620H)Bintuan Science and Technology Program(Nos.2020DB002 and 2022DB009)。
文摘Peroxymonosulfate(PMS)is commonly used in advanced oxidation processes to degrade organic pollutants in wastewater.In this work,to obtain better PMS activation efficiency,Bi_(4)O_(5)Br_(2)/BCZT(BBT)piezoelectric photocatalyst was designed.Abundant active radicals produced by BBT under visible light irradiation and ultrasonic vibration were used to activate PMS,thereby achieving rapid degradation of high concentration pollutants.With the introduction of BCZT,the catalyst has a strong internal electric field and three-dimensional lamellar structure,which promotes the separation and transfer of electrons and holes.It is worth noting that under optimal reaction conditions,the degradation rate of ARB reached 93%by BBT15 within 10 min.The catalytic experiment combined with the piezoelectric performance test results revealed the key role of piezoelectric photocatalytic reaction in PMS activation.This provides an important prospect for PMS to effectively deal with the degradation of high concentrations of organic pollutants.
基金supported by the National Natural Science Foundation of China(51708078,21576034)Chongqing Postdoctoral Science Foundation funded project(Xm2016027)the Innovative Research Team of Chongqing(CXTDG201602014,CXTDX201601016)~~
文摘Bi12O17Br2and Bi4O5Br2visible‐light driven photocatalysts,were respectively fabricated by hydrothermal and room‐temperature deposition methods with the use of BiBr3and NaOH as precursors.Both Bi12O17Br2and Bi4O5Br2were composed of irregular nanosheets.The Bi4O5Br2nanosheets exhibited high and stable visible‐light photocatalytic efficiency for ppb‐level NO removal.The performance of Bi4O5Br2was markedly higher than that of the Bi12O17Br2nanosheets.The hydroxyl radical(?OH)was determined to be the main reactive oxygen species for the photo‐degradation processes of both Bi12O17Br2and Bi4O5Br2.However,in situ diffuse reflectance infrared Fourier transform spectroscopy analysis revealed that Bi12O17Br2and Bi4O5Br2featured different conversion pathways for visible light driven photocatalytic NO oxidation.The excellent photocatalytic activity of Bi4O5Br2resulted from a high surface area and large pore volumes,which facilitated the transport of reactants and intermediate products,and provided more active sites for photochemical reaction.Furthermore,the Bi4O5Br2nanosheets produced more?OH and presented stronger valence band holeoxidation.In addition,the oxygen atoms of NO could insert into oxygen‐vacancies of Bi4O5Br2,whichprovided more active sites for the reaction.This work gives insight into the photocatalytic pollutant‐degradation mechanism of bismuth oxyhalide.
