首页|Tuning interfacial charge transfer for efficient visible-light-driven photodegradation and simultaneous H2 evolution

Tuning interfacial charge transfer for efficient visible-light-driven photodegradation and simultaneous H2 evolution

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The edge-graphitized carbon nitride(C3N4-Cg)was prepared by secondary pyrolysis to construct ZnO/C3N4-Cg(ZCN)type-Ⅱ heterojunction photocatalyst via a facile sonication dispersion method,which achieved～7.04-fold and～18.3-fold enhanced visible-light-driven photocatalytic performance for refrac-tory micropollutant removal and simultaneous hydrogen(H2)evolution respectively compared to con-ventional ZnO/g-C3N4 Step-scheme heterojunction.The apparent quantum efficiency of the ZCN0.4 het-erojunction reaches 0.92％(λ=420 nm).Such excellent performance stems from that the edge-graphene moieties stitched onto the interface of heterojunction extend light absorption to the full visible spec-trum,meanwhile,the built-in electric field generated during Fermi level alignment accompanying fa-vorable band-bending structure provides an effective pathway for the rapid migration of photoinduced electrons via the edge graphene channel to improve interfacial charge separation efficiency.Interestingly,the midgap states introduced in ZCN heterojunction could temporarily retain photoexcited electrons to effectively inhibit the in situ carrier recombination for improved photocatalytic H2 evolution.Moreover,ZCN/peroxymonosulfate system exhibited excellent anti-interference performance against complex water bodies under visible illumination due to the synergistic effect between the co-existing anions and organic matter.Meanwhile,the eco-friendly nature of the ZCN/peroxymonosulfate system showed no biotoxicity of reaction filtrate on cell proliferation after treatment,which avoided secondary contamination.Consid-ering the outstanding performance in photocatalysis,the ZCN system exhibits broad potential for practical applications in water pollution control and green energy production.

ZnOC3N4-CgHeterojunctionPhotodegradationHydrogen evolution

Zhiyang Li、Yaogang Chen、Yinghe Zhang、Wei Ai、Qian Lei、Tingjun Yao、Dan Zhong、Wenjie Liu、Wenbiao Jin、Lei Yang

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State Key Laboratory of Urban Water Resource and Environment,Shenzhen Key Laboratory of Organic Pollution Prevention and Control,School of Civil and Environmental Engineering,Harbin Institute of Technology Shenzhen,Shenzhen 518055,China

Key Laboratory of Northwest Water Resources,Environment and Ecology,Ministry of Education,School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China

CNAS Accredited Test Center,Guangdong Engineering Technology Research Center of Air Purification,Healthlead Co.,Ltd.,Shenzhen 518055,China

School of Science,Harbin Institute of Technology Shenzhen,Shenzhen 518055,China

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深圳市自然科学基金国家自然科学基金国家自然科学基金Major Program of Jiangxi Provincial Department of Science and Technology深圳市自然科学基金Startup Grant Harbin Institute of Technology(Shenzhen)Startup Talent Grant at Harbin Institute of Technology(Shenzhen)

GXWD20201230155427003-2020080211002500652170157521115301882022KSG01004JCYJ20220531095408020IA45001007HA11409066

2024

10.1016/j.jmst.2023.05.033

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.168(1)
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