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

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School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
§ Shanghai Entry-Exit Inspection and Quarantine Bureau, 1208 Minsheng Road, Shanghai 200135, China
*(G.Q.S.) E-mail: [email protected]. Tel.: +86 21 34206143.
*(L.L.) E-mail: [email protected]. Tel.: +86 21 54747567.
Cite this: ACS Appl. Mater. Interfaces 2016, 8, 31, 20048–20056
Publication Date (Web):July 14, 2016
https://doi.org/10.1021/acsami.6b05587
Copyright © 2016 American Chemical Society
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Abstract

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.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.6b05587.

  • Details on synthesis of CIS/ZnS:Al QDs, preparation of CIS/ZnS:Al-TiO2 photocatalyst, preparation of SiO2 sol and TiO2 paste, etching of CIS/ZnS:Al QDs, Tables S1–S3, and Figures S1–S4 (PDF)

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