Selective activation of peroxymonosulfate to singlet oxygen by engineering oxygen vacancy defects in Ti_(3)CNT_(x) MXene for effective removal of micropollutants in water  

作　　者：Limin Jin Shijie You Nanqi Ren Yanbiao Liu 

机构地区：[1]College of Environmental Science and Engineering,Textile Pollution Controlling Engineering Center of the Ministry of Ecology and Environment,Donghua University,2999 North Renmin Road,Shanghai 201620,China [2]State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Fundamental Research》2023年第5期770-776,共7页自然科学基础研究（英文版）

基　　金：the National Natural Science Foundation of China(52170068 and U21A20161);the Open Project of State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(QAK202108).

摘　　要：Defect engineering is an effective strategy to boost the catalytic activity of MXene towards heterogeneous peroxymonosulfate(PMS)activation for water decontamination.Herein,we developed a facile approach to fine-tune the generation of oxygen vacancies(OVs)on Ti_(3)CNT_(x)crystals by Ce-doping(Ce-Ti_(3)CNT_(x))with the aim of mediating PMS activation for the degradation of micropollutants in water.By varying the dopant content,the OV concentrations of Ti_(3)CNT_(x)could be varied to enable the activation of PMS to almost 100%singlet oxygen(1O2),and hence the effective degradation of sulfamethoxazole(SMX,a model micropollutant).Various advanced characterization techniques were employed to obtain detailed information on the microstructure,morphology,and defect states of the catalysts.The experimental results showed that SMX removal was proportional to the OVs level.Density functional theory(DFT)models demonstrated that,in contrast to pristine Ti_(3)CNT_(x),the OVs on 10%CeTi_(3)CNT_(x)could adsorb the terminal O of PMS,which facilitated the formation of SO_(5)•−as well as the generation of 1O2.We further loaded the optimized catalysts onto a polytetrafluoroethylene microfiltration membrane and also demonstrated the efficient removal of SMX from water using a convection-enhanced mass transport flowthrough configuration.This study provides new insights into the effective removal of micropollutants from water by integrating state-of-the-art defect engineering,advanced oxidation,and microfiltration techniques.

关 键 词：Oxygen vacancy Ce-doped MXene Peroxymonosulfate activation Singlet oxygen Water decontamination 

分 类 号：O64[理学—物理化学]