摘要
采用溶胶-凝胶法和电化学沉积法制备了3种形稳态电极,并通过形貌结构和电化学性质的表征,以及降解动力学实验筛选出性能最优的Ti/SnO_(2)-Sb/PbO_(2)-La电极材料。新污染物的降解速率和羟基自由基表观产率与电流密度呈正相关,并且总有机碳去除率均达到89%以上。Cl^(-)、HCO_(3)^(-)和腐殖酸对新污染物降解呈现不同程度的抑制作用。此外,基于恩诺沙星中间产物的鉴定和密度泛函理论计算推测了其两条降解路径,并且对中间产物的生物安全性进行了评价,结果显示污染物的可生物降解性有效提高,同时生物富集性和生物毒性显著降低。结果表明以Ti/SnO_(2)-Sb/PbO_(2)-La为阳极的电催化氧化技术对新污染物具有高效降解和脱毒能力。
In this study,we prepared three dimensionally stable anodes using sol-gel and electrochemical deposition methods.Among them,the Ti/SnO_(2)-Sb/PbO_(2)-La electrode exhibited remarkable catalytic performance,as demonstrated by the characterization of its morphological structure and electrochemical properties,as well as degradation kinetics experiments.The degradation rate constants of emerging contaminants(ECs)and the apparent yield of hydroxyl radicals in the system were found to be positively correlated with the current density range of 2~10 mA/cm^(2),resulting in total organic carbon removal rates exceeding 89%.It is worth noting that the presence of Cl^(-),HCO_(3)^(-),and humic acid had varying degrees of inhibitory effects on the removal of ECs.Based on the identification of intermediate byproducts and density functional theory calculations,we proposed two degradation pathways for ENR.Furthermore,the biosafety evaluation results indicated that the biodegradability of intermediate byproducts was significantly enhanced,while their bioaccumulation and biotoxicity decreased compared to the parent compound.These findings underscore the high efficiency of the electrocatalytic oxidation technique utilizing the Ti/SnO_(2)-Sb/PbO_(2)-La anode for the degradation and detoxification of ECs.
作者
杨庆
王寅骅
王冲
YANG Qing;WANG Yin-hua;WANG Chong(School of Resources and Environment,Southwest University,Chongqing 400715,China)
出处
《化学试剂》
CAS
2024年第4期72-79,共8页
Chemical Reagents
基金
国家自然基金青年基金项目(42007156)
中央高校基本科研业务费-能力提升项目(SWU-KT22061)。
关键词
新污染物
电催化氧化
电极
降解路径
理论计算
emerging contaminants
electrocatalytic oxidation
electrode
degradation paths
theoretical calculation
作者简介
杨庆(1999-),女,重庆人,硕士生,主要研究方向为高级氧化、废水处理;通讯作者:王冲,E-mail:wangc0928@swu.edu.cn。
