光催化
石墨氮化碳
氮化碳
碳酸盐
污染物
材料科学
Boosting(机器学习)
氮化物
化学工程
降级(电信)
化学
环境化学
纳米技术
催化作用
有机化学
冶金
电信
计算机科学
工程类
图层(电子)
机器学习
作者
Hong Xiao,Qi Zhang,Munir Ahmad,Shanshan Dong,Yanzong Zhang,Dexin Fang,Xiaojing Wang,Hong Peng,Yongjia Lei,Ganxue Wu,Yanfu Bai,Shihuai Deng,Fei Ye,Zhenxing Zeng
标识
DOI:10.1016/j.seppur.2022.122580
摘要
• A conceptual carbonate mediated hole transfer photocatalytic system is proposed. • carbonates can capture and transfer the photoinduced hole into solution in form of · CO 3 - • Efficient hole capture via carbonates oxidation boosts the charge separation. • The unique · CO 3 - /CO 3 2- shuttle boosting charge separation for enhanced · OH generation. • Enhanced · OH and · CO 3 - generation enables efficient organic pollutants degradation. Inspired by the important role of the manganese enzyme in photo-induced hole transfer of natural photosynthesis, we have developed an innovative carbonate-mediated-hole-transfer strategy for boosting the photocatalytic degradation of organic pollutants. We found that the carbonate species can effectively extract the photo-generated hole in the valence band of carbon nitride to generate · CO 3 - and leaves electron in the conduction band for oxygen reduction to generate · OH. The generated · CO 3 - can be returned to its pristine state of CO 3 2- via the oxidation of organic pollutants. The unique · CO 3 - /CO 3 2- shuttle could largely improve the charge separation via the fast hole extraction that leads to enhanced · OH generation for accelerating the photocatalytic degradation of organic pollutants. As expected, the as-prepared carbon nitride exhibits markedly enhanced photocatalytic performance toward formaldehyde, p-chlorophenol, and phenol degradation than the one without carbonate as additive. The conceptual study demonstrated here may offer new viewpoints in designing high-efficient photocatalytic systems for environmental applications.
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