摘要
以最具有代表性的氧化还原介体——四甲基哌啶氧化物(TEMPO)为研究对象,探究其强化高铁酸盐(Fe(VI))降新污染物的效能与作用机制.结果表明,该体系可在120s内对于磺胺甲恶唑(5μmol/L)的去除效率达到73%,通过深入分析,发现TEMPO+和Fe(V)/Fe(IV)是反应过程中的关键活性物种.同时对TEMPO浓度、初始pH值以及实际水体中常见组分(腐殖酸、无机阴离子)对反应体系的影响进行考察.由于均相催化剂回收利用困难且可能引发二次污染,进一步开发了4-氨基-TEMPO@SiO_(2)非均相催化剂,所制备非均相催化剂对于酚类、沙星类、四环素类污染物均表现出显著的强化效果,其中对苯酚和四环素的强化效果最好,可在20s内将其完全去除.
The most representative redox mediator,tetramethylpyrazine oxide(TEMPO),was used to investigate the efficacy and mechanism of its enhanced degradation of emerging contaminants by ferrate(Fe(VI)).The results showed that the system could remove 73%of sulfamethoxazole(5μmol/L)within 120 seconds.Through in-depth analysis,it was found that TEMPO+and Fe(V)/Fe(IV)are key active species in the system.Additionally,the effects of TEMPO concentration,initial pH and common components(humic acid,inorganic anions)in the actual water on the reaction system were investigated.Given the difficulties in recycling and potential secondary pollution of homogeneous catalysts,the 4-amino-TEMPO@SiO_(2) heterogeneous catalysts were further developed.The prepared heterogeneous catalyst demonstrated significant enhancement effects on phenolic,quinolone,and tetracycline pollutants,with the most notable effects on phenol and tetracycline,which can be completely removed in just 20 seconds.
作者
宋利先
郑成志
于永强
张静
马军
SONG Li-xian;ZHENG Cheng-zhi;YU Yong-qiang;ZHANG Jing;MA Jun(State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150000,China;Harbin Institute of Technology National Engineering Research Centre for Water Resources Ltd.,Harbin 150000,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第8期4588-4598,共11页
China Environmental Science
基金
国家自然科学基金面上项目(22076016)。
