MXene/PMS利用EDTA-Cu催化降解EDTA-Cd性能与机理  

Catalytic degradation of EDTA-Cd by EDTA-Cu in MXene/PMS process:Performance and mechanism

作　　者：宋浩然 徐一航 陈龙雨 赵群[1] 李晨 曹妍 张林丰 胡学伟[1] 刘树根[1] 李英杰[1] 李杰 田森林[1] SONG Hao-ran;XU Yi-hang;CHEN Long-yu;ZHAO Qun;LI Chen;CAO Yan;ZHANG Lin-feng;HU Xue-wei;LIU Shu-gen;LI Ying-jie;LI Jie;TIAN Sen-lin(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500

出　　处：《中国环境科学》2024年第12期6729-6740,共12页China Environmental Science

基　　金：国家自然科学基金(52100077,22366024,22366022);广东省基础与应用基础研究基金(2020A1515410002)。

摘　　要：在不添加低价态过渡金属条件下,MXene/PMS利用乙二胺四乙酸铜(EDTA-Cu)实现了乙二胺四乙酸镉(EDTA-Cd)的高效降解和Cd的回收.EDTA-Cd和总Cd在30min内的去除率达到80%和95%.增加MXene、PMS和Cu^(2+)浓度均显著增强了EDTA-Cd和总Cd的去除.反应体系主要活性物种是羟基自由基(HO^(·))和硫酸根自由基(SO_(4)^(·-)).在p H值3.0~9.0范围内保持了优异的性能,对Cl^(-)、HCO_(3)^(-)、HPO_(4)^(2-)和腐殖酸具有良好的耐受性.MXene活化PMS将EDTA-Cu氧化破络,释放出游离Cu离子,并触发Cu(Ⅱ)/Cu(Ⅰ)价态循环,强化了PMS的活化,从而实现了EDTA-Cu/Cd的高效降解.MXene对Cu和Cd离子具有优异的吸附能力,实现了重金属的回收.本研究利用重金属络合物本身含有的过渡金属,开发了一种同步实现重金属络合物氧化破络与重金属回收的方法.Without the addition of low-valent transition metals,MXene/PMS achieved efficient degradation of EDTA-Cd and recovery of Cd using copper ethylenediaminetetraacetate (EDTA-Cu).The removal efficiency of EDTA-Cd and total Cd reached 80%and 95% within 30 minutes,respectively.Increasing the concentrations of MXene,PMS,and Cu~2 significantly enhanced the removal of EDTA-Cd and total Cd.The primary reactive species in reaction process were identified as hydroxyl radical (HO~·) and sulfate radical (SO_(4)^(·-)).Excellent performance was maintained within a pH range of 3.0 to 9.0,with good resistance to Cl~-,HCO_(3)~-,HPO_(4)^(2-),and humic acid.Activation of PMS by MXene initiated the oxidative decomposition of EDTA-Cu and released free Cu ions.Then,MXene triggered the Cu(Ⅱ)/Cu(Ⅰ) cycle and furtherly enhanced PMS activation,and thereby achieved the efficient degradation of EDTA-Cu/Cd.Additionally,MXene exhibited excellent adsorption capacity for Cu and Cd ions,thus to achieve the recovery of heavy metals.This study utilized the transition metals inherent in heavy metal complexs to develop an efficient method that simultaneously achieves the oxidative decomplexation of heavy metal complexes and the recovery of heavy metals.

关 键 词：重金属络合物 Mxene 单过硫酸盐 Cu(Ⅱ)/Cu(Ⅰ)循环 

分 类 号：X703[环境科学与工程—环境工程]