异质结
光催化
光电流
光化学
X射线光电子能谱
光降解
甲基橙
激进的
材料科学
复合数
可见光谱
热液循环
降级(电信)
化学
光电子学
化学工程
催化作用
有机化学
复合材料
计算机科学
工程类
电信
作者
Saranya Juntrapirom,Doldet Tantraviwat,Sarunya Suntalelat,Oraphan Thongsook,Sukon Phanichphant,Burapat Inceesungvorn
标识
DOI:10.1016/j.jcis.2017.06.019
摘要
Novel SnS/BiOI heterostructures with excellent photocatalytic degradation of methyl orange were successfully prepared by a facile hydrothermal-coprecipitation method. The maximum methyl orange degradation activity under visible light irradiation (λ>400nm) was found for 10wt% SnS/BiOI. The composite also showed better stability and good recyclability compared to BiOI. The energy band diagram and band offsets from X-ray photoelectron spectroscopy investigation indicated that the novel composite was a type-II heterojunction where the photogenerated electron-hole can be efficiently separated and transferred. Results from UV-vis DRS, PL-TA and photocurrent response measurement suggested that the improved photodegradation efficiency of the SnS/BiOI heterojunction was mainly attributed to enhanced light absorption capability, strong ability to generate and transfer photoexcited charge carriers and high active species formation. Additionally, radical scavenging experiments demonstrated that holes and superoxide radicals are dominant active species, whereas hydroxyl radicals are of secondary importance in this system. A plausible photocatalytic mechanism of the SnS/BiOI composite was also discussed.
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