• 关键词：光电催化  活性碳纤维  过氧化氢  乙二胺四乙酸二钠

• 基金项目：格平绿色行动辽宁环境科研“123工程”资助（No.CEPF2014-123-2-18）

• 陈禹彤
• 1. 大连工业大学, 轻工与化学工程学院, 大连 116034;2. 中国科学院生态环境研究中心, 环境水质学实验室, 北京 100085

• 张秀芳
• 大连工业大学, 轻工与化学工程学院, 大连 116034

• 田世超
• 中国科学院生态环境研究中心, 环境水质学实验室, 北京 100085

• 王雁
• 中国科学院生态环境研究中心, 环境水质学实验室, 北京 100085

• 刘珊珊
• 中国科学院生态环境研究中心, 环境水质学实验室, 北京 100085

• 赵旭
• 中国科学院生态环境研究中心, 环境水质学实验室, 北京 100085

• 摘要：本研究构建了以活性碳纤维（Activated Carbon Fiber，ACF）为阴极，TiO₂/Ti与RuO₂/Ti为双阳极的光电催化体系.该体系中，RuO₂/Ti电阳极和TiO₂/Ti光阳极均有氧化作用，可同时氧化降解污染物；且电阳极具有较强析氧作用，能产生大量O₂；ACF阴极具有还原作用，可将体系中产生的O₂原位还原为H₂O₂；H₂O₂在紫外光下产生·OH，进而强化光电催化与电催化氧化过程，实现对水中乙二胺四乙酸二钠（EDTA）的高效去除.本论文详细考察了电流密度、pH、曝气等因素对EDTA降解效果的影响.结果表明，在EDTA初始浓度为300 mg·L^-1、溶液初始pH=4.84、电流密度为12 mA·cm^-2和光电流密度为0.012 mA·cm^-2的条件下，反应90 min后，EDTA降解率高于90%.该催化体系实现了EDTA的高效降解.

• Abstract：A photoelectrocatalytic system using TiO₂/Ti and RuO₂/Ti as bi-anode and activated carbon fiber(ACF)as cathode was designed. In this system, both RuO₂/Ti electric anode and TiO₂/Ti photo anode possess oxidation ability, and can degrade contaminants simultaneously. Meanwhile, the electric anode can produce large amounts of O₂, which can be reduced to H₂O₂. Under UV irradiation, H₂O₂ transformed to ·OH, which can enhance the photoelectric catalytic and electric catalytic oxidation process, and subsequently realizing the efficient removal of EDTA. The effects of current density, initial pH and dissolved oxygen on the degradation performance of EDTA were investigated. The results indicated that over 90% EDTA were eliminated after 90 min when the initial concentration of EDTA was 300 mg·L^-1, current density was 12 mA·cm^-2, photo current density was 0.012 mA·cm^-2 and initial pH was 4.84. This system realized the highly efficient degradation of EDTA.

• Key words：photoelectrocatalysis  activated carbon fiber  hydrogen peroxide  ethylene diamine tetraacetic acid

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