激进的
光催化
催化作用
光化学
光降解
化学
可见光谱
降级(电信)
单线态氧
复合数
辐照
电子转移
氧气
化学工程
材料科学
有机化学
复合材料
光电子学
工程类
核物理学
物理
电信
计算机科学
作者
Shan Li,Qipu Ma,Lei Chen,Zhi Yang,Muhammad Kamran,Baoliang Chen
标识
DOI:10.1016/j.cej.2021.134492
摘要
Construction of composite photocatalysts with high charge transfer efficiency and fast surface catalytic reaction has recently gained huge interest. In this work, a hydrochar microsphere-mediated photocatalyst Fe3O4/[email protected] with rapid surface catalytic reaction and electron transfer was fabricated. Under visible-LED-light irradiation, removal of refractory analgesic carbamazepine (CBZ) and total organic carbon (TOC) reached 100% and 67.41%, respectively, by Fe3O4/[email protected]% within 40 min, demonstrating the excellent photocatalytic activity compared to other photocatalysts. The narrower band gap (2.02 eV) of Fe3O4/[email protected] obviously improved the visible light absorption. The hydrochar with abundant surface oxygen functional groups provided more active oxygen species ·O2– (4.05 µM) and ·OH (107.8 nM), and acted as an electron bridge to promote the electron transfer of BiOBr and Fe3O4. Eleven main CBZ intermediates were identified and three degradation pathways were proposed to illustrate the contribution of superoxide radicals, hydroxyl radicals, and photogenerated holes to the photodegradation of CBZ. Furthermore, five-cycle reusing experiments revealed that Fe3O4/[email protected] composite catalysts have excellent reusability and stability, indicating that they have a promising application future.
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