Fabrication of SnO2 Nanopaticles/BiOI n-p Heterostructure for Wider Spectrum Visible-Light Photocatalytic Degradation of Antibiotic Oxytetracycline Hydrochloride
Fabrication of SnO2 Nanopaticles/BiOI n-p Heterostructure for Wider Spectrum Visible-Light Photocatalytic Degradation of Antibiotic Oxytetracycline Hydrochloride
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DOI：
10.1021/acssuschemeng.7b00501
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发表时间：
2017-06-01
影响因子：
8.4
通讯作者：
Zeng, Guang-Ming
中科院分区：
文献类型：
--
作者：
Wen, Xiao-Ju;Niu, Cheng-Gang;Zeng, Guang-Ming
本文采用简易化学浴法制备了n-p异质结构SnO2/BiOI光催化剂。应用光催化剂对抗生素盐酸土霉素（otch）和甲基橙（MO）在可见光照射下进行最小化。SnO2/BiOI复合材料对难降解污染物otch和MO的分解具有优异的光催化性能。所得催化剂中，SnO2/BiOI质量分数为30 wt %的样品光催化性能最好。系统地研究了影响otch降解的几个反应参数，如初始浓度、离子种类和浓度。材料的光学和电学性质表明，通过在SnO2/BiOI杂化中形成n-p结，电子-空穴对的转移速率显著提高。此外，结合DRS和XPS分析证实了SnO2/BiOI结的能带对准，为提出的机制提供了有力的支持。本研究为构建新型p-n结光催化剂提供了新的途径，并为其他异质结催化剂的研究提供了参考。
In this work, n-p heterostructure SnO2/BiOI photocatalyst was successfully fabricated through a facile chemical bath method. The photocatalysts was applied to minimize antibiotic oxytetracycline hydrochloride (OTTCH) and methyl orange (MO) under visible light irradiation. SnO2/BiOI composite exhibited excellent photocatalytic performance for the refractory pollutant OTTCH and MO decomposition. The sample of 30 wt % SnO2/BiOI possessed the best photocatalytic performance in all the obtained catalysts. Several reaction parameters affecting OTTCH degradation such as initial concentration, ion species, and concentration were investigated systematically. The optical and electrical properties of materials demonstrate that the transfer rate of electron-hole pairs dramatically improve though forming an n-p junction in SnO2/BiOI hybrid. Moreover, the energy band alignments of SnO2/BiOI junction were confirmed via combining DRS and XPS analysis, which provided strong support for the proposed mechanism. This work could provide a new approach to construct new p-n junction photocatalysts and a reference for the study of other heterojunction catalysts.