摘要
以TiO_(2)/Ti电极板为阳极、海绵状多孔金属泡沫镍为阴极、三聚磷酸盐(TPP)为电解质,构建了TPP-电芬顿体系,对水中亚甲基蓝(MB)进行降解。循环伏安测试结果表明,TPP具有提升电芬顿体系氧化性能的特质。在TPP与Fe^(2+)的摩尔比为10∶3、TPP浓度为5.0 mmol/L、初始pH为6、电流为200 mA的优化条件下进行曝气反应,60 min时MB去除率可达97.0%,360 min时TOC去除率可达67.0%。而以Na2SO4为电解质的常规电芬顿体系在适宜pH下的MB去除率仅为55.0%。机理分析结果表明,·O_(2)^(-)是导致MB降解的主要活性氧物种,而·OH可促进MB不完全降解产物进一步矿化。
Using TiO_(2)/Ti electrode plate as anode,spongy porous metal nickel foam as cathode and tripolyphosphate(TPP)as electrolyte,TPP-electro-fenton system was constructed to degrade methylene blue(MB)in water.Cyclic voltammetry test results show that TPP has the characteristics of improving the oxidation performance of electro-Fenton system.When the aeration reaction is carried out under the optimized conditions of molar ratio of TPP to Fe^(2+)10∶3,TPP concentration 5.0 mmol/L,initial pH 6 and current 200 mA,the removal rate of MB is 97.0%at 60 min,and the removal rate of TOC is 67.0%at 360 min.However,the removal rate of MB in conventional electro-Fenton system with Na2SO4 as electrolyte is only about 55.0%at the appropriate pH.The results of mechanism analysis show that·O_(2)^(-)is the main active oxygen species leading to the degradation of MB,and·OH can promote further mineralization of the incomplete products in MB degradation.
作者
段任静
崔玉
杨宇航
丁鑫末
马迁
戴捷
DUAN Renjing;CUI Yu;YANG Yuhang;DING Xinmo;MA Qian;DAI Jie(College of Chemical and Environmental Engineering,Yangtze University,Jingzhou 434023,China)
出处
《化工环保》
CAS
CSCD
北大核心
2023年第1期58-63,共6页
Environmental Protection of Chemical Industry
基金
国家自然科学基金项目(2117326)
湖北省自然科学基金重点项目(2013CFA107)
荆州市科技项目(2019EC61-14)。
关键词
三聚磷酸盐
电芬顿
亚甲基蓝
自由基
降解机理
tripolyphosphate
electro-Fenton
methylene blue
free radical
degradation mechanism
