Improvement of the degradation of pesticide deethylatrazine by combining UV photolysis with electrochemical generation of hydrogen peroxide

过氧化氢 化学 电解 降级(电信) 高级氧化法 光解 污染物 电化学 阳极 曝气 氧气 羟基自由基 阴极 辐照 光化学 环境化学 电极 激进的 催化作用 有机化学 物理 核物理学 物理化学 电信 电解质 计算机科学
作者
Phivos Frangos,Wenhua Shen,Huijiao Wang,Xiang Li,Gang Yu,Shubo Deng,Jun Huang,Bin Wang
出处
期刊:Chemical Engineering Journal [Elsevier]
卷期号:291: 215-224 被引量:48
标识
DOI:10.1016/j.cej.2016.01.089
摘要

An electrochemically induced UV/H2O2 (E-UV/H2O2) process was developed by combining UV254 irradiation with electrolysis. The E-UV/H2O2 process uses a carbon-based cathode to electrochemically produce H2O2 from O2 in the sparged oxygen gas, air, or from O2 generated from anodic side reactions such as water oxidation. The in-situ generated H2O2 then undergoes UV254 induced photolysis to yield OH, which is a powerful oxidant and can therefore significantly enhance pollutant degradation in the E-UV/H2O2 process. Results show that when pure O2, air, or anodically-induced O2 (without aeration) was used as the oxygen source for cathodic H2O2 production, the E-UV/H2O2 process increased the rates of deethylatrazine (DEA) degradation by ∼205%, 148%, and 116%, respectively, compared with the mathematical sum of the individual rates of corresponding UV photolysis (k = 0.129 min−1) and electrolysis (k = 0.003 min−1) processes. Due to its faster pollutant degradation kinetics, the E-UV/H2O2 process decreased the electrical energy consumption for 90% DEA removal by ∼49–64% compared with UV photolysis alone. These results indicate that by applying a small current to electro-generate H2O2 from O2 during UV irradiation, the E-UV/H2O2 process can significantly improve the kinetics and energy efficiency for pollutant degradation. The E-UV/H2O2 process may thus offer a simple and effective way to improve the performance of existing UV processes for pollutant degradation in water and wastewater treatment.
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