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Ternary semiconductor ZnxAg1-xS nanocomposites for efficient photocatalytic degradation of organophosphorus pesticides †

Abstract

Construction of ternary semiconductor nanostructures has attracted much attention in photocatalysis by virtue of the tunable elemental composition and band structure. Herein, ternary semiconductor ZnxAg1-xS (0 ≤ x ≤ 1) composites were successfully prepared by a simple and low-cost hydrothermal method using without any surfactant. Combined analyses using XRD, N2 sorption, SEM, TEM and UV-vis DRS revealed that the ternary compound semiconductor materials exhibited well-developed crystalline frameworks, high surface areas of 15–70 m2 g–1, 10–30 nm size, and outstanding UV light absorption properties. The data of XRD and TEM indicate that photocatalysis might contribute to the formation of the strong interfacial interaction between the ZnS and Ag2S nanoparticles. Photocatalytic activities were investigated by the degradation of organophosphorus pesticides including malathion (MLT), monocrotophos (MCP) and chlorpyrifos (CPS) using ZnxAg1-xS composites under UV light irradiation. The toxicity of MLT, MCP, and CPS was reduced by photocatalysis and photolysis; however, photocatalysis had a greater impact. The superior photocatalytic performance of Zn0.5Ag0.5S catalyst was exhibited due to the high surface area and presence of Ag0 with improved charge transfer than the bare ZnS and Ag2S. The stability and reusability assays indicated that the Zn0.5Ag0.5S composite retained more than 85% of activity after five cycles of use. On the basis of the results, a possible photocatalytic mechanism of the prepared samples was proposed. This study indicates a potential application of the ternary semiconductor materials in the efficient UV light-driven photocatalysis of other pollutants that may cause environmental pollution.

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Publication details

The article was received on 30 May 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8PP00220G
Citation: Photochem. Photobiol. Sci., 2018, Accepted Manuscript
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    Ternary semiconductor ZnxAg1-xS nanocomposites for efficient photocatalytic degradation of organophosphorus pesticides †

    A. Dasari and V. Guttena, Photochem. Photobiol. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8PP00220G

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