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电化学−类芬顿体系降解染料废水研究

发表时间:2017-06-30  浏览量:163  下载量:9
全部作者: 王嘉,黄雅玮,周涛,吴晓晖,毛娟
作者单位: 上实环境控股(武汉)有限公司;华中科技大学环境科学与工程学院
摘 要: 针对芬顿工艺降解有机污染物时Fe2+过量投加和H2O2利用率低等问题,提出一种基于铁−乙二胺四乙酸二钠(EDTA)配合物的新型电化学−类芬顿联用高级氧化体系(Electro-Fe2+/EDTA),该体系中的Fe2+-EDTA能原位活化溶解氧,生成羟基自由基,同时生成的Fe3+-EDTA能被电化学辅助还原,重新生成Fe2+-EDTA. 研究结果表明,该体系在3 h内对活性染料罗丹明B(RhB)的降解效率可达85%. 并利用响应曲面法对降解实验进行Box-Behnken design(BBD)实验设计和模拟优化,考察初始RhB浓度、pH值、电极电压和Fe2+与EDTA的配比(Fe2+:EDTA)等不同参数条件对RhB降解效果的影响。结果表明,所获模型的预测值和实验实际值十分接近,证明模型对电化学−类芬顿体系降解RhB具有较高的可靠性,而初始RhB浓度、pH值、电极电压及Fe2+:EDTA均对RhB的降解效率具有影响。
关 键 词: 环境化学;电化学−类芬顿氧化;响应曲面法;铁-EDTA配合物;罗丹明B
Title: Degradation of dye wastewater in a combined electrochemical Fenton-like system
Author: WANG Jia, HUANG Yawei, ZHOU Tao, WU Xiaohui, MAO Juan
Organization: SIIC Environmental Holdings (Wuhan)Co., Ltd.; School of Environmental Science and Engineering, Huazhong University of Science and Technology
Abstract: To improve the utilizing efficiency of Fe2+ and H2O2 in traditional Fenton system, a novel combined electrochemical Fenton-like system (Electro-Fe2+/EDTA) was proposed in this study, where activation of O2via Fe2+-EDTA complex to hydroxyl radical and electrochemical regeneration of Fe2+ species would occur simultaneously. It demonstrated that the system could efficiently degrade an azo dye pollutant Rhodamine B (RhB) and 85% degradation efficiency was obtained after 3 h treatment. Furthermore, response surface methodology was used to optimize the important operation parameters in this system and Box-Behnken design (BBD) was adopted. Initial RhB concentration, pH, electrode voltage and Fe2+ with EDTA dosing ratio (Fe2+:EDTA) were investigated. It was found that the obtained model could successfully predict the degradation efficiency of RhB at optimized conditions, while initial RhB concentration, pH, electrode voltage and Fe2+:EDTA would significantly affectthe degradation efficiency.
Key words: environmental chemistry; electrochemical Fenton-like oxidation; response surface methodology; iron-EDTA ligand; Rhodamine B
发表期数: 2017年6月第12期
引用格式: 王嘉,黄雅玮,周涛,等. 电化学−类芬顿体系降解染料废水研究[J]. 中国科技论文在线精品论文,2017,10(12):1345-1351.
 
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