Tin bisulfide nanoplates anchored onto flower-like bismuth tungstate nanosheets for enhancement in the photocatalytic degradation of organic pollutant
2022
Lv, Yan-Ran | Wang, Zhi-Lin | Yang, Yuan-Xin | Luo, Ying | Yang, Si-Yuan | Xu, Yue-Hua
The development of efficient heterojunctions through a simple and facile method is an effective way to enhance the photocatalytic performance of bismuth-based oxide semiconductors for industrial applications. Here, the novel flower-like type II SnS₂/Bi₂WO₆ heterostructure consisting of bismuth tungstate (Bi₂WO₆) nanosheets and tin bisulfide (SnS₂) nanoplates was successfully designed and synthesized. The crystal structure, composition, morphology, and photoelectric properties of the heterostructure were systematically characterized. In addition, the photocatalytic activity of SnS₂/Bi₂WO₆ was analyzed and compared with Bi₂WO₆ or SnS₂ alone or physical mixture of SnS₂ and Bi₂WO₆. 2%SnS₂/Bi₂WO₆ presents a 3.1 times greater degradation rate constant (0.0065 min–¹) than that of Bi₂WO₆ (0.0021 min–¹) under low visible light irradiation (5.3 mW·cm–², a 44 W LED), while SnS₂ alone exhibits no photocatalytic effect toward glyphosate. Furthermore, 2%SnS₂/Bi₂WO₆ maintains 93% of its original photocatalytic activity even after four cycles. The possible photocatalytic degradation pathway of glyphosate and photocatalytic mechanism are also proposed. The excellent photocatalytic performance of SnS₂/Bi₂WO₆ is attributed to the decoration of SnS₂ nanoplates on the surface of Bi₂WO₆, appropriate (113)/(020) ratio, increased visible-light absorption, and effective separation of photoinduced carriers. This paper reports a new methodology that can act as a reference basis to design and develop visible-light responsive photocatalysts with outstanding photocatalytic performance for carbon dioxide reduction, water splitting, and pollutant degradation.
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