稀有金属电极增强电化学臭氧耦合体系降解双氯酚酸研究

发布时间：2018-02-24 14:43

本文关键词： 双氯芬酸稀有金属电极电化学臭氧高级氧化　出处：《化学研究与应用》2016年12期 　论文类型：期刊论文

【摘要】：通过比较钛镀钌铱、钛镀铱钽、钛镀钌铱锡、钛镀铂四种不同的钛镀稀有金属电极增强电化学臭氧耦合体系协同去除水中双氯酚酸的效率,选择降解效能较优的钛镀铱钽金属电极,并研究在该电极下双氯芬酸初始浓度、臭氧浓度、电流强度、自由基捕获剂\电解质种类、温度、初始p H值等因素对该耦合体系降解效率的影响。实验结果表明:电化学臭氧耦合氧化体系对水中双氯芬酸的去除有一定的协同作用,相同条件下处理16 min,钛镀铱钽电极在耦合体系中对双氯芬酸的去除率最高,接近100%,比单独臭氧和单独电化学氧化去除率的加和值增大了16.90%。该体系影响因素实验表明:初始p H值和电流强度分别为5和0.10 A时,双氯芬酸降解率最高。臭氧浓度与双氯芬酸降解率呈正相关。随着体系温度的升高,该耦合体系对双氯芬酸的降解率先升高后降低,硫酸钠和硝酸钠作为电解质对双氯芬酸的降解较有利,而使用氯化钠作为电解质时,双氯芬酸的降解率较低。加入自由基捕获剂叔丁醇对反应速率有明显的抑制现象,说明反应体系中产生了强氧化性的羟基自由基。
[Abstract]:By comparing the efficiency of titanium plating ruthenium iridium, titanium iridium tantalum, titanium ruthenium iridium tin, titanium platinum plating rare metal electrode enhanced electrochemical ozone coupling system, the efficiency of synergistic removal of dichlorophenolic acid in water was studied. Iridium tantalum electrode with better degradation efficiency was selected, and the initial concentration of diclofenac, ozone concentration, current intensity, species of free radical trapping agent / electrolyte, temperature were studied. The effect of initial pH value on the degradation efficiency of the coupling system was studied. The experimental results showed that the electrochemical ozone coupling oxidation system had a synergistic effect on the removal of diclofenac in water. Under the same conditions, the removal rate of diclofenac was the highest in the coupled system with titanium iridium tantalum electrode for 16 min. Close to 100, the addition value of removal efficiency of ozone and electrochemical oxidation increased by 16.900.The experimental results show that the initial pH value and current intensity are 5 and 0.10 A, respectively. The degradation rate of diclofenac was the highest. The ozone concentration was positively correlated with the degradation rate of diclofenac. The degradation rate of diclofenac was lower when sodium chloride was used as electrolyte and sodium sulfate and sodium nitrate as electrolyte. The reaction rate was obviously inhibited by adding tert-butanol, a free radical trapping agent. The results show that strong hydroxyl radical is produced in the reaction system.
【作者单位】：重庆大学城市建设与环境工程学院;石河子大学水利建筑工程学院;重庆大学三峡库区生态环境教育部重点实验室;
【基金】：国家自然科学基金(51308563) 2014年中央高校基本科研业务费(106112014CDJZR210004) 大型仪器基金(20146150031) 第七届重庆大学“大学生科研训练计划”项目(454)
【分类号】：X703

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