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Stable and Flexible CuInS2/ZnS:Al-TiO2 Film for Solar-Light-Driven Photodegradation of Soil Fumigant

Yan, Lili, Li, Zhichun, Sun, Mingxing, Shen, Guoqing, Li, Liang
ACS Applied Materials & Interfaces 2016 v.8 no.31 pp. 20048-20056
1,3-dichloropropene, air, aluminum, fumigants, irradiation, photocatalysis, photocatalysts, photolysis, polyethylene terephthalates, quantum dots, soil, solar radiation, titanium dioxide, zinc sulfide
Semiconductor quantum dots (QDs) are suitable light absorbers for photocatalysis because of their unique properties. However, QDs generally suffer from poor photochemical stability against air, limiting their applications in photocatalysis. In this study, a stable solar-light-driven QDs-containing photocatalytic film was developed to facilitate photocatalytic degradation of the soil fumigant 1,3-dichloropropene (1,3-D). Highly stable CuInS₂/ZnS:Al core/shell QDs (CIS/ZnS:Al QDs) were synthesized by doping Al into the ZnS shell and controlling ZnS:Al shell thickness; the CIS/ZnS:Al QDs were subsequently combined with TiO₂ to form a CIS/ZnS:Al-TiO₂ photocatalyst. The optimized ZnS:Al shell thickness for 1,3-D photodegradation was approximately 1.3 nm, which guaranteed and balanced the good photocatalytic activity and stability of the CIS/ZnS:Al-TiO₂ photocatalyst. The photodegradation efficiency of 1,3-D can be maintained up to more than 80% after five cycles during recycling experiment. When CIS/ZnS:Al-TiO₂ was deposited as photocatalytic film on a flexible polyethylene terephthalate substrate, over 99% of cis-1,3-D and 98% of trans-1,3-D were depleted as they passed through the film during 15 h of irradiation under natural solar light. This study demonstrated that the stable CIS/ZnS:Al-TiO₂ photocatalyst both in powder and film form is a promising agent for photodegradation and emission reduction of soil fumigants.