Tremendously enhanced catalytic performance of Fe(Ⅲ)/peroxymonosulfate process by trace Cu(Ⅱ):A high-valent metals domination in organics removal  

作　　者：Jieli Ou Yiqing Liu Linyue Zhang Zhenran Wang Yuqi Tang Yongsheng Fu Dandan Zhao 

机构地区：[1]Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China

出　　处：《Journal of Environmental Sciences》2025年第1期487-497,共11页环境科学学报(英文版)

基　　金：supported by the Sichuan Science and Technology Program(No.2021YJ0385);the Project in Yangtze River Ecological Environment Protection and Restoration(No.2022-LHYJ-02-0509-08).

摘　　要：Dissolved copper and iron ions are regarded as friendly and economic catalysts for peroxymonosulfate(PMS)activation,however,neither Cu(Ⅱ)nor Fe(Ⅲ)shows efficient catalytic performance because of the slow rates of Cu(Ⅱ)/Cu(Ⅰ)and Fe(Ⅲ)/Fe(Ⅱ)cycles.Innovatively,we observed a significant enhancement on the degradation of organic contaminants when Cu(Ⅱ)and Fe(Ⅲ)were coupled to activate PMS in borate(BA)buffer.The degradation efficiency of Rhodamine B(RhB,20μmol/L)reached up to 96.3%within 10 min,which was higher than the sum of individual Cu(Ⅱ)-and Fe(Ⅲ)-activated PMS process.Sulfate radical,hydroxyl radical and high-valent metal ions(i.e.,Cu(Ⅲ)and Fe(IV))were identified as the working reactive species for RhB removal in Cu(Ⅱ)/Fe(Ⅲ)/PMS/BA system,while the last played a predominated role.The presence of BA dramatically facilitated the reduction of Cu(Ⅱ)to Cu(Ⅰ)via chelating with Cu(Ⅱ)followed by Fe(Ⅲ)reduction by Cu(Ⅰ),resulting in enhanced PMS activation by Cu(Ⅰ)and Fe(Ⅱ)as well as accelerated generation of reactive species.Additionally,the strong buffering capacity of BA to stabilize the solution pH was satisfying for the pollutants degradation since a slightly alkaline environment favored the PMS activation by coupling Cu(Ⅱ)and Fe(Ⅲ).In a word,this work provides a brand-new insight into the outstanding PMS activation by homogeneous bimetals and an expanded application of iron-based advanced oxidation processes in alkaline conditions.

关 键 词：PEROXYMONOSULFATE Bimetallic catalyst BORATE High-valent metals COMPLEXATION 

分 类 号：X703[环境科学与工程—环境工程]