光催化
光降解
异质结
罗丹明B
材料科学
复合数
可见光谱
反应速率常数
半导体
降级(电信)
化学工程
光化学
纳米技术
催化作用
化学
光电子学
复合材料
动力学
计算机科学
有机化学
物理
电信
工程类
量子力学
作者
Xiadiye Aihemaiti,Xin Wang,Yunpeng Liu,Yun Wang,Li Xiao,Yuhua Ma,Kezhen Qi,Yu Zhang,Jing Liu,Jinyu Li
出处
期刊:Chemosphere
[Elsevier]
日期:2022-06-01
卷期号:296: 134013-134013
被引量:35
标识
DOI:10.1016/j.chemosphere.2022.134013
摘要
The construction of wide bandgap semiconductors with heterojunctions is an effective strategy to improve the photocatalytic activity of narrow-bandgap semiconductors, such as red phosphorus (RP). The novel step-scheme (S-scheme) heterojunction can separate photocarriers effectively while retaining the high reduction-oxidation capacity of the catalyst. Herein, a SnO2/hydrothermally treated RP (SnO2/HRP) S-scheme heterojunction was constructed and was found to display superior performance in the photocatalytic degradation of pollutants and the disinfection of bacteria. The 5%SnO2/HRP (mass ration of SnO2 with 5 wt%) composite had the strongest photocatalytic activity. It could degrade 97.5% of Rhodamine B (RhB) after 12 min of light exposure. The photodegradation rate constant of this composite reached 2.96 × 10-1 min-1, which was 4.4 and 59.2 times higher than that of pure HRP and SnO2, respectively. Furthermore, this S-scheme heterojunction composite exhibited a higher efficient photocatalytic antibacterial rate (99.4%) for Escherichia coli (E. coli) under visible-light irradiation, than pure HRP (66.4%) and SnO2 (72.9%). Further mechanistic investigations illustrated that the intimate contact between HRP and SnO2 in the S-scheme system heterojunction could effectively boost carrier transfer and improve the photocatalytic activity of the semiconductor. This investigation provided an efficient recyclable S-scheme heterojunction composite for the photocatalytic degradation of pollutants and bacteria.
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