富氧空位Zn_(2)Co_(1)O_(x)电极的制备及其催化降解氯酚污染物的机制研究  

Preparation of Oxygen-Rich Vacancy Zn_(2)Co_(1)O_(x)Electrode and Its Mechanism of Chlorophenol Pollutants Degradation

作　　者：马莹莹 刘晨 王娅 何亮 周华晶 MA Yingying;LIU Chen;WANG Ya;HE Liang;ZHOU Huajing(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Xinlian Environmental Science and Technology Co.,Ltd.,Kunming 650211,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650500 [2]云南新联环境科技有限公司,云南昆明650211 [3]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《昆明理工大学学报(自然科学版)》2025年第2期126-135,共10页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：云南省重点研发计划课题(202303AC100002-03);国家自然科学基金项目(52260009);云南省科技厅科技计划项目(昆明理工大学“双一流”创建联合专项)(202201BE070001-044).

摘　　要：在推行多年无元素氯漂白技术后,我国造纸行业中含氯漂白废水中的可吸附有机卤素的总含量已大幅下降.但是,仍有少量高毒性、难降解的氯酚类物质随生化尾水排出,形成生态安全隐患,急需合理处置.为此,开发了先进阴极材料——Zn_(2)Co_(1)O_(x)并在弱电场辅助下实现了氯酚污染物的高效去除.研究表明,富含氧空位的Zn_(2)Co_(1)O_(x)实现了从四电子和二电子到一电子氧还原途径的转变,电子利用效率大大加强,电子转移数为1.18.活性物种鉴定表明,此途径为非常规的氧还原途径产生非自由基(·O^(-)_(2))和活性氯自由基(Cl·/Cl·^(-)_(2))的协同过程.电催化实验显示,氧空位修饰的电极材料Zn_(2)Co_(1)O_(x)还具备优异的抗腐蚀、自清洁性,可实现含氯废水毒性的整体下降.After implementing chlorine-free bleaching technology for many years,the total content of adsorbable organic halogens in chlorinated bleaching wastewater in China s papermaking industry has decreased significantly.However,a small amount of highly toxic and refractory chlorophenols are still discharged with biochemical tail water,posing ecological safety hazards and requiring reasonable disposal.To address this issue,this paper first developed an advanced cathode material,Zn_(2)Co_(1)O_(x),and achieved efficient removal of chlorophenol pollutants with the assistance of a weak electric field.The research revealed that Zn_(2)Co_(1)O_(x),rich in oxygen vacancies,transformed its utilization pathway from four-electron and two-electron to one-electron,significantly enhancing electron utilization efficiency,electron transfer number of 1.18.Identification of active species indicated that this pathway was an unconventional oxygen reduction pathway through the generation of non-radical(·O^(-)_(2))and active chlorine radical(Cl·/Cl·^(-)_(2)).Electrocatalytic experiments showed that the oxygen vacancy-modified electrode membrane Zn_(2)Co_(1)O_(x)also possessed excellent corrosion resistance and self-cleaning properties,enabling an overall reduction in the toxicity of chlorinated wastewater.

关 键 词：氧空位 一电子途径 活性氯自由基 活性氧物种 电催化 

分 类 号：TQ426[化学工程] X703[环境科学与工程—环境工程]