Coupled Cu doping and Z-scheme heterojunction for synergistically enhanced tetracycline photodegradation  

作　　者：Huidong Shen Chunming Yang Song Hong Leiduan Hao Liang Xu Alex W.Robertson Zhenyu Sun 

机构地区：[1]Country State Key Laboratory of Organic-Inorganic Composites,College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China [2]Shaanxi Key Laboratory of Chemical Reaction Engineering,College of Chemistry and Chemical Engineering,Yan’an University,Yan’an 716000,China [3]Department of Physics,University of Warwick,Coventry CV 47AL,UK

出　　处：《Nano Research》2024年第7期5937-5948,共12页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21972010);the National Key Research and Development Program of China(No.2022YFC2105900).

摘　　要：Semiconductor-based photocatalysis by utilizing solar energy for sustainable organic pollutant elimination has been a promising tactic to alleviate environmental issues.Nevertheless,the development of robust and efficient photocatalysts to degrade organic pollutants still faces major challenges because of insufficient charge separation.Here we design and fabricate a heterojunction consisting of copper,carbon-modified TiO_(2),and sulfur-doped g-C_(3)N_(4)nanosheets(i.e.,S-C_(3)N_(4)/Cu/C-TiO_(2)).The heterostructure affords a remarkable synergistic photocatalysis for tetracycline hydrochloride degradation,achieving an 82.6%removal efficiency within 30 min under visible light irradiation,about 15.4 and 7.3 times higher than that of S-C_(3)N_(4)and C-TiO_(2),respectively.The superior performance is attributed to the synergy between Cu doping and the Z-scheme heterojunction,which not only enhances the interfacial electric field effect,facilitating charge separation,but also boosts the redox capability.The charge carrier transfer between Cu/C-TiO_(2)and S-C_(3)N_(4)follows a Z-scheme,as verified by trapping experiments,electron spin-resonance spectroscopy,and density functional theory calculations.Furthermore,the tetracycline hydrochloride degradation pathways are enunciated by liquid chromatograph mass spectrometry analysis.This work provides an effective approach for constructing high-performance photocatalysts that have potential in environmental remediation.

关 键 词：photocatalysis Cu doping Z-scheme heterojunction electrons and holes separation tetracycline degradation 

分 类 号：O64[理学—物理化学]