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摘要
Fenton深度氧化技术用于污染物的降解,受到许多工艺条件的影响和制约,针对不同体系寻求各影响因素最优化的科学配置关系,具有重要的理论意义和应用价值。通过引入功率可调的超声波,采用正交设计法科学优化实验方案,详细考察了超声功率、Fe2+浓度、H2O2浓度、温度和pH 5个因素对于Fenton体系氧化降解模拟污染水体中四氯化碳(CCl4)的影响规律,判定了影响CCl4降解效果的各因素之间的主次关系,确定了最优化的降解反应工艺条件,同时基于优选的工艺参数,验证了单一因素变化对降解效果的影响。结果显示:超声波协同的Fenton体系,同等条件下能够把CCl4的降解率提高26.96%;协同降解CCl4的优化反应条件为温度303K、pH=3、H2O2浓度20mmol/L、Fe2+浓度2.50mmol/L及超声功率300W。此条件下,反应45min时,CCl4的降解率可达到78.49%,明显高于不加超声处理的对比实验效果;该降解过程符合一级反应动力学特征,表观活化能为6.99kJ/mol。
Abstract
As a kind of advanced oxidation technology,Fenton system,used for degradation of pollutants,could be influenced by various reaction factors,which requires systematically intensive study.By introducing power-adjustable ultrasonic wave,the variation of degradation of aqueous CCl4 caused by the main factors (temperature,ultrasonic power,pH value,and Fe2+/H2O2 ratio) were investigated on base of orthogonal design principle and related experimental arrangement,which concluded the primary and secondary relation for the factors,and ascertained the optimum reaction conditions.Also,under the optimum conditions,the single factor study verified the synergistic reinforcement of ultrasonic wave.The results suggested that the optimized parameters [T=303K,pH=3,P=300W,c(Fe2+)=2.50mmol/L,c(H2O2)=20mmol/L],which increased the degradation ratio of CCl4 reached to 78.49% in 45min.Via chemical kinetic analysis,the degradation process could be estimated as first-order kinetic reaction with the apparent activation energy of 6.99kJ/mol.
关键词
超声协同
/
Fenton体系
/
四氯化碳
/
降解
Key words
ultrasonic synergy
/
Fenton system
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carbon tetrachloride
/
degradation
超声协同Fenton体系氧化降解废水中的CCl4[J].
化工新型材料, 2018, 46(7): 212-215 DOI:
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基金资助
国家自然科学基金资助项目(21576073,21076063);河南省科技攻关计划项目(102102210170);洛阳市科技攻关项目(1101030A);洛阳市矿产资源化工重点实验室建设项目(1003016A)
