摘要
以TiO_(2)/Ti板为阳极,石墨毡(GF)为阴极,二硅酸钠(SD)为电解质,构建SD-EF体系,对染料废水进行降解,考察了不同EF体系对染料废水降解效果以及SD-EF反应的最适宜条件,并对体系中的活性物种进行了检测,初步探讨了降解机理。不同EF体系降解染料废水结果显示:SD-EF体系在pH值为3和6时,对罗丹明B(RhB)降解率分别99.85%和93.90%,速率常数分别为0.441 9和0.246 7 h^(-1),与常规EF相比,降解率分别提高了0.7和2.5倍,速率常数分别提高了4.12和5.78倍;单因素实验结果表明:在n(SD)∶n(Fe^(2+))为2.5∶1.0,Fe^(2+)浓度为0.008 mol·L^(-1),pH值为6,电流200 mA条件下降解60 min,RhB降解率可达97.27%;机理分析结果表明:·OH是SD-EF体系的主要活性氧物种,同时·O^(-)_(2)也对RhB的降解有一定的贡献作用。
Using TiO_(2)/Ti plate as anode,graphite felt(GF)as cathode and sodium disilsilicate(SD)as electrolyte,SD-EF system was constructed to degrade dye wastewater.The degradation effect of different EF systems on dye wastewater and the optimal conditions of SD-EF reaction were investigated,and the active species in the system were detected,and the degradation mechanism was initially discussed.The experimental results show that:At pH=3 and 6,the degradation rates of Rhodamine B(RhB)in SD-EF system were 99.85%and 93.9%,and the rate constants were 0.4419 h^(-1) and 0.2467 h^(-1),respectively.Compared with conventional EF,the degradation rates were increased by 0.7 and 2.5 times,and the rate constants were increased by 4.12 and 5.78 times,respectively.The results of single factor experi-ment showed that the degradation rate of RhB could reach 97.27%when molar ratio of SD and Fe2+was 2.5∶1.0,Fe^(2+)concentration was 0.008 mol·L^(-1),pH was 6 and the current was 200 mA for 60 min.The mechanism analysis showed that·OH was the main reactive oxygen species in SD-EF system,and·O_(2)^(-) al-so contributed to the degradation of RhB.
作者
杨洋
陈双桥
段少芳
戴捷
魏平方
YANG Yang;CHEN Shuangqiao;DUAN Shaofang;DAI Jie;WEI Pingfang(College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou 434023,Hubei,China;Jiangling County Ecological Environment Monitoring Station,Jingzhou 434104,Hubei,China)
出处
《化学工业与工程》
北大核心
2025年第3期109-115,共7页
Chemical Industry and Engineering
基金
国家自然科学基金(2117326)
湖北省自然科学基金重点项目(2013CFA107)
荆州市科技项目(019EC61-14)。
关键词
二硅酸钠
电芬顿
罗丹明B
降解机理
sodium disilsilicate
electro-Fenton
Rhodamine B
degradation mechanism
