In-situ Synthesis of SnO 2 Quantum Dots/ZnS Nanosheets Heterojunction as a Visible-light-driven Photocatalyst for Degrad
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https: //doi. org/10.1007/s11595-020-2313-6
In-situ Synthesis of SnO2 Quantum Dots/ZnS Nanosheets Heterojunction as a Visible-light-driven Photocatalyst for Degradation of Rhodamine B, Potassium Dichromate and Tetracycline ZHANG Chenxu1, WU Xiangfeng1*, JIA Yunning1, CHANG Tianlong1, LIU Zhifeng2, FU Yunxuan1, LIU Xutao1, WANG Hui1*, SHI Yimai1, ZUO Yuqian1
(1.School of Materials Science and Engineering, Hebei Provincial Key Laboratory of Traffic Engineering Materials, Shijiazhuang Tiedao University, Shijiazhuang 050043, China; 2.Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, Tianjin 300384, China)
Abstract: The SnO2 quantum dots (SnO2QDs)/ZnS nanosheets (ZnSNs) heterojunction was fabricated via an in-situ synthetic method at room temperature. Rhodamine B, potassium dichromate, and tetracycline were used to discuss the photocatalytic activities of the as-prepared samples under the visible light illumination. The photocatalytic mechanism of the as-prepared samples was also proposed. The experimental results indicate that the degradation efficiency of the as-prepared SnO2QDs/ZnSNs heterojunction first increases and then decreases with increasing the usage of ZnSNs. When the mass ratio of SnO2QDs to ZnSNs is 1: 2 in 180 min, the asprepared samples have the highest degradation efficiency of 89.1% for rhodamine B, 97.7% for potassium dichromate, and 83.8% for tetracycline, which are much higher than 51.7%, 26.8%, and 0.9% of pure SnO2QDs as well as 37.9%, 87.1%, and 19.1% of pure ZnSNs, respectively. After it is repeatedly degraded for 3 times, it possesses the degradation efficiency of 62.5% for rhodamine B, which increases by 200.5% in comparison with 20.8% of the pure SnO2QDs. Moreover, the enhanced photocatalytic performances of the as-prepared hybrids are attributed to the formation of heterojunction between the SnO 2QDs and ZnSNs. In addition, hydroxyl radicals and superoxide anion radicals play major roles during the photocatalytic degradation process, while holes play a minor role. Key words: ZnS nanosheets; SnO2 quantum dots; photocatalysis
1 Introduction In recent years, with the rapid development of industrialization and growth of population, the consumption of fossil fuels has been greatly increased. The environmental problems, especially industrial wastewater, domestic sewage and agricultural chemicals in water, make people faced more and more challenges[1,2]. It is significantly to find a pollutionfree solution to deal with these problems[3,4]. Among © Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: July 12, 2019; Accepted: Sept. 27, 2019) ZHANG Chenxu(张琛旭): E-mail: [email protected] *Corresponding authors: WU Xiangfeng(吴湘锋): Assoc. Prof.; Ph D; E-mail: [email protected]; WANG Hui(王惠): Lecturer; Ph D; E-mail: [email protected] Funded by the Natural Science Foundation of Hebei Province (Nos. E2019210251 and B2019210331), and the Innovation Ability Improv-ement Project of Hebei Province (20
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