To improve β-Bi2O3 photocatalysis,we couple β-Bi2O3 with BiO I to form β-Bi2O3/BiO I heterojunctions through an in-situ treatment with hydriodic acid. The prepared heterojunctions are characterized with X-ray diffr...To improve β-Bi2O3 photocatalysis,we couple β-Bi2O3 with BiO I to form β-Bi2O3/BiO I heterojunctions through an in-situ treatment with hydriodic acid. The prepared heterojunctions are characterized with X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy,ultra violet-diffuse reflectance spectroscopy,and X-ray photoelectron spectroscopy. Upon visible-light irradiation（λ 420 nm）,the β-Bi2O3/BiO I heterojunctions,especially with the molar ratio of HI to β-Bi2O3 at 0.4,exhibit much higher photocatalytic activity than pure β-Bi2O3 and BiO I for the degradation of methyl orange. The efficient separation of photogenerated electron-hole pairs across the interface of the heterojunction between β-Bi2O3 and BiO I would be responsible for the enhanced photocatalytic performances.展开更多
Although Bi_(7)O_(9)I_(3) is an oxygen-rich bismuth oxyiodide with higher photocatalytic activity than BiOI,its applicability for photocatalytic oxidation is limited by the rapid recombination of photogenerated carrie...Although Bi_(7)O_(9)I_(3) is an oxygen-rich bismuth oxyiodide with higher photocatalytic activity than BiOI,its applicability for photocatalytic oxidation is limited by the rapid recombination of photogenerated carriers and poor reusability.Depositing Bi_(7)O_(9)I_(3) on flexible macro-sized carbonaceous materials is a promising approach for promoting photogenerated electron migration and improving reusability.In this study,a composite consisting of Bi_(7)O_(9)I_(3) supported on graphitic carbon paper(Bi_(7)O_(9)I_(3)-CP)was synthesized via the in situ transformation of a BiOl-deposited carbon paper precursor(BiOl-CP).The as-prepared Bi_(7)O_(9)I_(3)-CP exhibited higher visible-light-driven photocatalytic activity than both Bi_(7)O_(9)I_(3) and BiOI-CP precursor for phenol removal.The improved photocatalytic activity of Bi_(7)O_(9)I_(3)-CP was attributed to its hierarchical structure and promoted carrier separation,as revealed by photoluminescence,pore structure,and reactive radical analyses.Moreover,owing to its macroscale size and flexibility,the Bi_(7)O_(9)I_(3)-CP composite could be easily operated and reused,which are favorable for practical applications.展开更多
BiOI microspheres were synthesized via a facile hydrolytic method with sodium dodecyl sulfate （SDS）. The results showed that 8% SDS-BiOI microspheres possessed the homogeneous morphology, larger specific surface are...BiOI microspheres were synthesized via a facile hydrolytic method with sodium dodecyl sulfate （SDS）. The results showed that 8% SDS-BiOI microspheres possessed the homogeneous morphology, larger specific surface area and more oxygen vacancies compared with the pure BiOl. Moreover, the adsorption efficiency of rhodamine B （RhB） and methyl orange （MO） for 8% SDS-BiOI reached almost 96.4% and 79.4%, respectively. It was found that the oxygen vacancy induced by SDS improved adsorption performance of BiOI due to the enhanced electrostatic interaction.展开更多
In this paper,a photoelectrocatalytic(PEC)recovery of toxic H_(2)S into H_(2)and S system was proposed using a novel bismuth oxyiodide(BiOI)/tungsten trioxide(WO_(3))nano-flake arrays(NFA)photoanode.The BiOI/WO_(3)NFA...In this paper,a photoelectrocatalytic(PEC)recovery of toxic H_(2)S into H_(2)and S system was proposed using a novel bismuth oxyiodide(BiOI)/tungsten trioxide(WO_(3))nano-flake arrays(NFA)photoanode.The BiOI/WO_(3)NFA with a vertically aligned nanostructure were uniformly prepared on the conductive substrate via transformation of tungstate following an impregnating hydroxylation of BiI3.Compared to pure WO_(3)NFA,the BiOI/WO_(3)NFA promotes a significant increase of photocurrent by 200%.Owing to the excellent stability and photoactivity of the BiOI/WO_(3)NFA photoanode and I-/I-3 catalytic system,the PEC system toward splitting of H_(2)S totally converted S_(2)-into S without any polysulfide(Sn-x)under solar-light irradiation.Moreover,H_(2)was simultaneously generated at a rate of about 0.867 mL/(h·cm).The proposed PEC H_(2)S splitting system provides an efficient and sustainable route to recover H_(2)and S.展开更多
基金supported by the National Natural Science Foundation of China(21273281)the National Basic Research Program of China(973 Program2013CB632405)~~
文摘To improve β-Bi2O3 photocatalysis,we couple β-Bi2O3 with BiO I to form β-Bi2O3/BiO I heterojunctions through an in-situ treatment with hydriodic acid. The prepared heterojunctions are characterized with X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy,ultra violet-diffuse reflectance spectroscopy,and X-ray photoelectron spectroscopy. Upon visible-light irradiation（λ 420 nm）,the β-Bi2O3/BiO I heterojunctions,especially with the molar ratio of HI to β-Bi2O3 at 0.4,exhibit much higher photocatalytic activity than pure β-Bi2O3 and BiO I for the degradation of methyl orange. The efficient separation of photogenerated electron-hole pairs across the interface of the heterojunction between β-Bi2O3 and BiO I would be responsible for the enhanced photocatalytic performances.
基金National Natural Science Foundation of China(Nos.52073034,21871030)Natural Science Foundation of Hunan Province of China(No.2018JJ2457)Scientific Research Foundation of Hunan Provincial Education Department of China(No.18A370).
文摘Although Bi_(7)O_(9)I_(3) is an oxygen-rich bismuth oxyiodide with higher photocatalytic activity than BiOI,its applicability for photocatalytic oxidation is limited by the rapid recombination of photogenerated carriers and poor reusability.Depositing Bi_(7)O_(9)I_(3) on flexible macro-sized carbonaceous materials is a promising approach for promoting photogenerated electron migration and improving reusability.In this study,a composite consisting of Bi_(7)O_(9)I_(3) supported on graphitic carbon paper(Bi_(7)O_(9)I_(3)-CP)was synthesized via the in situ transformation of a BiOl-deposited carbon paper precursor(BiOl-CP).The as-prepared Bi_(7)O_(9)I_(3)-CP exhibited higher visible-light-driven photocatalytic activity than both Bi_(7)O_(9)I_(3) and BiOI-CP precursor for phenol removal.The improved photocatalytic activity of Bi_(7)O_(9)I_(3)-CP was attributed to its hierarchical structure and promoted carrier separation,as revealed by photoluminescence,pore structure,and reactive radical analyses.Moreover,owing to its macroscale size and flexibility,the Bi_(7)O_(9)I_(3)-CP composite could be easily operated and reused,which are favorable for practical applications.
基金supported by the National Natural Science Foundation of China (No. 11179029)the Science Technology PlanProject of Hebei Province (No. 15211109D)Hebei Normal University (No. L2017K05)
文摘BiOI microspheres were synthesized via a facile hydrolytic method with sodium dodecyl sulfate （SDS）. The results showed that 8% SDS-BiOI microspheres possessed the homogeneous morphology, larger specific surface area and more oxygen vacancies compared with the pure BiOl. Moreover, the adsorption efficiency of rhodamine B （RhB） and methyl orange （MO） for 8% SDS-BiOI reached almost 96.4% and 79.4%, respectively. It was found that the oxygen vacancy induced by SDS improved adsorption performance of BiOI due to the enhanced electrostatic interaction.
基金This work was supported by the National Key Research and Development Program of China(Nos.2018YFE0122300 and 2018YFB1502001)Shanghai International Science and Technology Cooperation Fund Project(No.18520744900)and the SJTU-AMED.
文摘In this paper,a photoelectrocatalytic(PEC)recovery of toxic H_(2)S into H_(2)and S system was proposed using a novel bismuth oxyiodide(BiOI)/tungsten trioxide(WO_(3))nano-flake arrays(NFA)photoanode.The BiOI/WO_(3)NFA with a vertically aligned nanostructure were uniformly prepared on the conductive substrate via transformation of tungstate following an impregnating hydroxylation of BiI3.Compared to pure WO_(3)NFA,the BiOI/WO_(3)NFA promotes a significant increase of photocurrent by 200%.Owing to the excellent stability and photoactivity of the BiOI/WO_(3)NFA photoanode and I-/I-3 catalytic system,the PEC system toward splitting of H_(2)S totally converted S_(2)-into S without any polysulfide(Sn-x)under solar-light irradiation.Moreover,H_(2)was simultaneously generated at a rate of about 0.867 mL/(h·cm).The proposed PEC H_(2)S splitting system provides an efficient and sustainable route to recover H_(2)and S.
