【摘 要】
：
Semiconductor-mediated photocatalysis is a promising photochemical process for harvesting inexhaustible solar energy to address the energy crisis and environmental issues.However,the low solar-light response and poor carrier migration are severe drawbacks
【机 构】
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Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education,Chongqin
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Semiconductor-mediated photocatalysis is a promising photochemical process for harvesting inexhaustible solar energy to address the energy crisis and environmental issues.However,the low solar-light response and poor carrier migration are severe drawbacks that limit its practical application.Herein,we propose a convenient pathway for improving electron-hole separation and solar energy utilisation by engineering defective ZnIn2S4 with doping of carbon dots.The optimum ZnIn2S4/CD200 nanosheet exhibited 100％ diclofenac (DCF) degradation within 12 min under visible-light.The estimated photocatalytic efficiency under natural sunlight was 98.2％.Scavenging experiments and electron spin resonance (ESR) analysis indicated that the superoxide radical (O2·-),photoelectron (e),hole (h+) and hydroxyl radical (·OH) were the predominant contributions in the ZnIn2S4/CD200/DCF/visible light system.Furthermore,ZnIn2S4/CD200 exhibited excellent reusability and stability after 4 times recycling.The photodegradation routes mainly involved hydroxylation,decarboxylation,C—N bond cleavage,dechlorination,ring closure,and ring-opening.The ecological risk assessment and total organic carbon(TOC) tests exhibited desirable toxicity reduction and mineralization results.These observations not only offer a facile strategy for the construction of defective ZnIn2S4,but also pioneer the direct utilisation of natural light for highly efficient environmental remediation.
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