环境工程学报2024，Vol.18Issue(8)：2121-2131,11.DOI:10.12030/j.cjee.202403112
氧掺杂氮化碳纳米片活化过二硫酸盐选择性去除酚类污染物的特性与机制
Performance and mechanism of selective degradation of phenolic pollutants by peroxydisulfate activated over oxygen doped graphic carbon nitride nanosheets
摘要
Abstract
Oxygen doped graphic carbon nitride(O-CN)nanosheets was prepared via thermal exfoliation by using tannic acid as the oxygen source,aiming to tuning the surface electronic structures of carbon nitride and enhancing its performance toward the activation of peroxydisulfate(PDS)and degradation of phenolic pollutants.The variation of the electronic structure of O-CN nanosheets induced by oxygen doping was investigated.The performance and mechanism of PDS activation and phenolic pollutants degradation over O-CN was studied systematically.The results showed that oxygen doping mainly occurred on nitrogen positions,leading to redistribution of surface electrons and formation of unpaired electrons,which greatly enhanced the activation of PDS and degradation of phenolic pollutants.Under neutral conditions and the mole ratio of 1:10 for phenolic pollutants to PDS,phenolic pollutants(such as bis-phenol A,phenol and acetaminophen)could be completely removed by O-CN(0.1 g·L-1)within 60 min.The degradation of phenolic pollutants was mainly depended on electron transfer regime according to the electron paramagnetic resonance tests(EPR),chemical quenching experiments,in situ Raman analysis and electrochemical measurements.The nonradical oxidation pathway led to good anti-interference capability to complex surroundings like inorganic ions.The O-CN nanosheets showed a good stability and can be used to construct catalytic membrane for degrading phenolic pollutants continuously.Complete removal of bis-phenol A with a high mineralization efficiency(60％)occurred during 10 h of operation.关键词
高级氧化/氮化碳/氧掺杂/酚类污染物/电子转移Key words
advanced oxidation process/graphitic carbon nitride/oxygen doping/phenolic pollutants/electron transfer分类
资源环境引用本文复制引用
李丹阳,高悦莹,张哲睿,张佳乐,王震鑫,王根,杨生炯..氧掺杂氮化碳纳米片活化过二硫酸盐选择性去除酚类污染物的特性与机制[J].环境工程学报,2024,18(8):2121-2131,11.基金项目
陕西省自然科学基础研究计划(2024JC-YBMS-290) （2024JC-YBMS-290）
