Formation efficiency of hydroxyl radical from H2O2 decomposition over Cu/Al2O3 catalyst

doi:10.11949/j.issn.0438-1157.20180532

Abstract

Abstract:

Heterogeneous Fenton reaction is an effective method for the degradation of organic pollutants in the waste water. The improvement of H₂O₂ utilization efficiency for hydroxyl (·OH) production is the primary challenge to enhance the efficiency and reduce the cost for waste water degradation. Cu/Al₂O₃ catalysts were prepared through a sol-gel method. Based on the formation efficiency of ·OH, the reaction temperature, the pH of the reaction solution and the initial concentration of H₂O₂ were the main factors determining the utilization of H₂O₂ by single factor experiments. Through the design of experiments via response surface methodology and the analysis of the regression equation, the influence of three independent variables, initial H₂O₂ concentration, pH and reaction temperature, and their interactions on H₂O₂ utilization efficiency was evaluated. To achieve the highest H₂O₂ utilization efficiency, the optimum parameters were determined as 707 mg·L^-1 of H₂O₂ initial concentration, 5.12 of pH and 59.4℃ of reaction temperature. The corresponding H₂O₂ utilization efficiency is 0.57 and the relative error is only 3.5% compared with experimental value, suggesting that response surface methodology can provide important guidance on reducing cost and improving efficiency for waste water treatment.

Key words: Fenton reaction, waste water, catalyst, response surface methodology, hydrogenperoxide utilization efficiency, radical

摘要：

非均相Fenton催化反应是降解废水中有机污染物的有效方法。提高H₂O₂分解生成羟基自由基（·OH）的利用率是提升废水处理效率、降低成本的关键。使用溶胶-凝胶法制备了Cu/Al₂O₃催化剂，基于·OH的生成效率，通过单因素实验发现反应温度、反应溶液pH及H₂O₂初始浓度是决定H₂O₂利用率的主要因素。通过响应面法进行实验设计，分析响应面方程，考察了H₂O₂初始浓度、溶液pH及反应温度三个因素之间的交互作用及其对反应过程的影响。以H₂O₂利用率的最大化为目标优化反应条件，当H₂O₂初始浓度、溶液pH及反应温度分别为707 mg·L^-1、5.12及59.4℃时，H₂O₂利用率可高达0.57，与实验结果相对误差仅为3.5%。所得结果对降低废水处理成本、提高降解效率具有重要的指导作用。

关键词: Fenton反应, 废水, 催化剂, 响应面法, 双氧水利用率, 自由基

CLC Number:

O643.3

TIAN Pengfei, SHENG Yiyi, SUN Yang, DING Doudou, XU Jing, HAN Yifan. Formation efficiency of hydroxyl radical from H₂O₂ decomposition over Cu/Al₂O₃ catalyst[J]. CIESC Journal, 2018, 69(11): 4713-4721.

田鹏飞, 盛依依, 孙杨, 丁豆豆, 徐晶, 韩一帆. Cu/Al₂O₃催化剂用于H₂O₂分解生成羟基自由基的效率[J]. 化工学报, 2018, 69(11): 4713-4721.

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Formation efficiency of hydroxyl radical from H₂O₂ decomposition over Cu/Al₂O₃ catalyst

Cu/Al₂O₃催化剂用于H₂O₂分解生成羟基自由基的效率

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