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
In this study,a series of Na_(2)S-and S^(0)-decorated ZSM-5 adsorbents were prepared and their Hg^(0) adsorption performance was evaluated.Given that S^(0) and Na_(2)S were co-doped with the mass ratio of S^(0) to ZSM...In this study,a series of Na_(2)S-and S^(0)-decorated ZSM-5 adsorbents were prepared and their Hg^(0) adsorption performance was evaluated.Given that S^(0) and Na_(2)S were co-doped with the mass ratio of S^(0) to ZSM-5 fixed to 2:1,Hg^(0) removal efficiency quadruples compared with raw ZSM-5 and reached ca.100%at 300°C.Combined with the characterization results,it could be concluded that chemical properties,instead of physical structures,played an important role in Hg^(0) removal.Among the various gas components,O_(2),NO,and SO_(2) made negligible impacts on Hg^(0) capture over 2:1-S/ZSM-5 adsorbent surface.After recycling four times,Hg^(0) removal efficiency of 2:1-S/ZSM-5 adsorbent remained higher than 80%,which was indica-tive of a certain recyclability.Finally,XPS results illustrated that S^(0) and S^(2−)on 2:1-S/ZSM-5 surface functioned as the active sites for the transformation of Hg^(0) to HgS,which facilitated the chemisorption process and consequently led to an improved Hg^(0) capture performance.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This work is supported by the National Natural Science Foundation of China(No.51568024).
文摘In this study,a series of Na_(2)S-and S^(0)-decorated ZSM-5 adsorbents were prepared and their Hg^(0) adsorption performance was evaluated.Given that S^(0) and Na_(2)S were co-doped with the mass ratio of S^(0) to ZSM-5 fixed to 2:1,Hg^(0) removal efficiency quadruples compared with raw ZSM-5 and reached ca.100%at 300°C.Combined with the characterization results,it could be concluded that chemical properties,instead of physical structures,played an important role in Hg^(0) removal.Among the various gas components,O_(2),NO,and SO_(2) made negligible impacts on Hg^(0) capture over 2:1-S/ZSM-5 adsorbent surface.After recycling four times,Hg^(0) removal efficiency of 2:1-S/ZSM-5 adsorbent remained higher than 80%,which was indica-tive of a certain recyclability.Finally,XPS results illustrated that S^(0) and S^(2−)on 2:1-S/ZSM-5 surface functioned as the active sites for the transformation of Hg^(0) to HgS,which facilitated the chemisorption process and consequently led to an improved Hg^(0) capture performance.
