Devising exceptional S-scheme heterojunction photocatalysts utilized in annihilating pharmaceuticals and chromium contamination is significant for addressing the problem of global water pollution.In this work,a chemic...Devising exceptional S-scheme heterojunction photocatalysts utilized in annihilating pharmaceuticals and chromium contamination is significant for addressing the problem of global water pollution.In this work,a chemically bonded Mn0.5Cd_(0.5)S/BiOBr S-scheme heterostructure with oxygen vacancies is ingeniously developed through a facile in-situ solvothermal synthesis.The designed Mn0.5Cd_(0.5)S/BiOBr heterojunction exhibits eminently reinforced photo-activity for destruction of tetracycline hydrochloride and Cr(VI)as compared with its individual components.This substantial photo-redox performance amelioration is benefitted from the creation of an intense internal electric field(IEF)via supplying powerful driving force and migration highway by interfacial chemical bond to foster the S-scheme electron/hole disintegration.More intriguingly,the IEF at the hetero-interface drives the fast consumption of the photo-induced holes in Mn0.5Cd_(0.5)S by the photoelectrons from BiOBr,profoundly boosting the enrichment of active photo-carriers and sparing the photo-corrosion of Mn0.5Cd_(0.5)S.Furthermore,Mn0.5Cd_(0.5)S/BiOBr with exceptional anti-interference property can work efficiently in real water matrices.Multiple uses of the recycled Mn0⋅5Cd0⋅5S/BiOBr evidence its prominent robustness and stability.This achievement indicates the vast potential of chemically bonded S-scheme photosystems with structural defects in the design of photo-responsive materials for effective wastewater treatment.展开更多
A series of BiOBr@biomass carbon derived from locust leaves materials(BiOBr@BC)were fabricated and the photocatalytic property was investigated for photocatalytic degradation of rhodamine B(RhB)under visible light.The...A series of BiOBr@biomass carbon derived from locust leaves materials(BiOBr@BC)were fabricated and the photocatalytic property was investigated for photocatalytic degradation of rhodamine B(RhB)under visible light.The morphology,structure and photoelectrochemical properties of the photocatalysts were characterized by means of SEM,TEM,XRD,XPS,FT-IR,BET,PL,UV-vis/DRS,and EIS techniques.The results showed that the introduction of BC significantly enhanced the photocatalytic activity.When the content of biomass carbon(BC)in a composite is 3%(based on the mass of BiOBr),the obtained BiOBr@BC-3 exhibits excellent photocatalytic activity,degrading 99%of RhB within 20 min.The excellent degradation efficiency after the introduction of BC can be attributed to the enhanced visible light absorption,narrower band gap,and fast electron-hole pair separation rate.The photocatalytic mechanism on the degradation of RhB was illustrated based on the radicals'trapping experiments and semiconductor energy band position.The proposed material is expected to be of significant application value in the field of wastewater treatment.展开更多
基金supported by the National Natural Science Foundation of China(U1809214)the Natural Science Foundation of Zhejiang Province(LY20E080014 and LTGN23E080001)the Science and Technology Project of Zhoushan(2022C41011).
文摘Devising exceptional S-scheme heterojunction photocatalysts utilized in annihilating pharmaceuticals and chromium contamination is significant for addressing the problem of global water pollution.In this work,a chemically bonded Mn0.5Cd_(0.5)S/BiOBr S-scheme heterostructure with oxygen vacancies is ingeniously developed through a facile in-situ solvothermal synthesis.The designed Mn0.5Cd_(0.5)S/BiOBr heterojunction exhibits eminently reinforced photo-activity for destruction of tetracycline hydrochloride and Cr(VI)as compared with its individual components.This substantial photo-redox performance amelioration is benefitted from the creation of an intense internal electric field(IEF)via supplying powerful driving force and migration highway by interfacial chemical bond to foster the S-scheme electron/hole disintegration.More intriguingly,the IEF at the hetero-interface drives the fast consumption of the photo-induced holes in Mn0.5Cd_(0.5)S by the photoelectrons from BiOBr,profoundly boosting the enrichment of active photo-carriers and sparing the photo-corrosion of Mn0.5Cd_(0.5)S.Furthermore,Mn0.5Cd_(0.5)S/BiOBr with exceptional anti-interference property can work efficiently in real water matrices.Multiple uses of the recycled Mn0⋅5Cd0⋅5S/BiOBr evidence its prominent robustness and stability.This achievement indicates the vast potential of chemically bonded S-scheme photosystems with structural defects in the design of photo-responsive materials for effective wastewater treatment.
基金the National Natural Science Foundation of China(51572185)Natural Science Foundation of Shanxi Province(202203021211158 and 20210302123176)+1 种基金the Key Research&Development Program of Shanxi Province(Social Development,201903D321060)the Key Research&Development program of Shanxi Province(International Cooperation,201903D421079)for the financial support.
文摘A series of BiOBr@biomass carbon derived from locust leaves materials(BiOBr@BC)were fabricated and the photocatalytic property was investigated for photocatalytic degradation of rhodamine B(RhB)under visible light.The morphology,structure and photoelectrochemical properties of the photocatalysts were characterized by means of SEM,TEM,XRD,XPS,FT-IR,BET,PL,UV-vis/DRS,and EIS techniques.The results showed that the introduction of BC significantly enhanced the photocatalytic activity.When the content of biomass carbon(BC)in a composite is 3%(based on the mass of BiOBr),the obtained BiOBr@BC-3 exhibits excellent photocatalytic activity,degrading 99%of RhB within 20 min.The excellent degradation efficiency after the introduction of BC can be attributed to the enhanced visible light absorption,narrower band gap,and fast electron-hole pair separation rate.The photocatalytic mechanism on the degradation of RhB was illustrated based on the radicals'trapping experiments and semiconductor energy band position.The proposed material is expected to be of significant application value in the field of wastewater treatment.
