光催化
六价铬
催化作用
可见光谱
铬
材料科学
环境修复
降级(电信)
光降解
共价键
化学工程
化学
光化学
有机化学
冶金
污染
生态学
工程类
生物
电信
光电子学
计算机科学
作者
Rituporn Gogoi,Swadhin Kumar Jena,Astha Singh,Kajal Sharma,Kirti Khanna,Sumanta Chowdhury,RAJESH SHARMA,Prem Felix Siril
标识
DOI:10.1016/j.jece.2024.112006
摘要
Visible light active, metal-free heterogeneous photocatalysts are required to achieve sustainable and green chemical processes. Development of such a catalyst is reported here. Mechanical pulverization of a covalent organic framework (COF) resulted in enhanced visible light photocatalytic activity for environmental remediation. The pulverized COF could achieve apparent quantum yield (AQY) up to 41% for photo-Fenton-like degradation of organic dyes. Photocatalytic activity of the pulverized COF is one of the highest among the metal-free catalysts reported so far. The photocatalyst can operate under a broad range of pH, unlike metal-based photocatalysts. The catalyst does not lose its activities on recycling over several cycles. The exceptional performance of the pulverized COF is due to the high dispersibility, efficient visible light absorption, and excellent charge mobility. Moreover, the photocatalyst could be used in continuous flow photo-Fenton-like degradation. The photocatalytic space time yield (PSTY) in continuous flow was boosted by twenty-eight times than the conventional batch photocatalysis. Moreover, the pulverized COF showed an outstanding photocatalytic reduction of toxic hexavalent chromium (Cr6+) to non-toxic trivalent (Cr3+).
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