期刊
CHEMOSPHERE
卷 286, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131783
关键词
Bi7O9I3; Oxygen vacancies; Photodegradation; EPA; oxygen activation
资金
- National Key Research and Development Program of China [2018YFC1900105]
- National Natural Science Foundation of China [21976054, 21836001]
- Beijing Outstanding Young Scientist Program
This study proposed a facile strategy to introduce oxygen vacancies in Bi-based oxyiodides for activating molecular oxygen and achieving efficient photocatalytic degradation of BPA. The optimized Bi7O9I3 exhibited excellent photocatalytic activity and structural stability, with oxygen vacancies playing a crucial role in enhancing electron transfer and activating molecular oxygen for degradation of BPA molecules. Such efforts may potentially be extended to the synthesis of other 2D photocatalysts for effective charge-carrier separation and molecular oxygen activation.
Two-dimensional (2D) bismuth-based semiconductors have aroused intensive concern owing to their prominent photocatalytic activity for organic pollutants removal. In this work, a facile strategy for introducing oxygen vacancy in Bi-based oxyiodides (BixOyIz) sheet-like architectures to activate molecular oxygen was proposed. 'rhe structure, photoelectric properties and visible light (lambda > 420 nm) induced photocatalytic activities of these samples for decomposition of bisphenol A (BPA) were systematically characterized and evaluated. The asprepared Bi7O9I3 with a feeding BO molar ratio of 1:1 exhibited the best photocatalytic activity comparable to those of similarly synthesized Bi7O9I3 with other molar ratios and BiOIO3 catalysts. The optimal Bi7O9I3 achieved excellent photocatalytic activity with 99.6 % degradation efficiency of BPA within 20 min and superior structural stability with 95.1 % degradation retention over 5 cycling tests. In addition, the resulting Bi7O9I3 sample displayed a high mineralization efficiency of BPA. Importantly, the plenty of oxygen vacancies (V-os) exsiting in Bi7O9I3 played the dominant role in both accelerating electron transfer and activating molecular oxygen to facilitate the generation of superoxide radical (O-2(center dot-)) and singlet oxygen (O-1(2)), thereby proceeding oxidative degradation of BPA molecules during photoreactions. The efforts and attempts are also extendable to synthesis other 2D photocatalysts, providing potential for effective charge-carrier separation and molecular oxygen activation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据