化学
激进的
分解
光化学
氮化物
锰
氮气
氮化碳
无机化学
碳纤维
光催化
石墨氮化碳
催化作用
羟基自由基
材料科学
有机化学
图层(电子)
复合数
复合材料
作者
Qishi Si,Huazhe Wang,Junyan Kuang,Banghai Liu,Shanshan Zheng,Qi Zhao,Wenrui Jia,Yaohua Wu,Hao Lü,Qinglian Wu,Tao Yu,Wanqian Guo
标识
DOI:10.1016/j.jhazmat.2023.131463
摘要
Recently, Mn-based materials have a great potential for selective removal of organic contaminants with the assistance of oxidants (PMS, H2O2) and the direct oxidation. However, the rapid oxidation of organic pollutants by Mn-based materials in PMS activation still presents a challenge due to the lower conversion of surface Mn (III)/Mn (IV) and higher reactive energy barrier for reactive intermediates. Here, we constructed Mn (III) and nitrogen vacancies (Nv) modified graphite carbon nitride (MNCN) to break these aforementioned limitations. Through analysis of in-situ spectra and various experiments, a novel mechanism of light-assistance non-radical reaction is clearly elucidated in MNCN/PMS-Light system. Adequate results indicate that Mn (III) only provide a few electrons to decompose Mn (III)-PMS* complex under light irradiation. Thus, the lacking electrons necessarily are supplied from BPA, resulting in its greater removal, then the decomposition of the Mn (III)-PMS* complex and light synergism form the surface Mn (IV) species. Above Mn-PMS complex and surface Mn (IV) species lead to the BPA oxidation in MNCN/PMS-Light system without the involvement of sulfate (SO4• ̶) and hydroxyl radicals (•OH). The study provides a new understanding for accelerating non-radical reaction in light/PMS system for the selective removal of contaminant.
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