Fenton试剂强化超声—光催化降解苯并三氮唑的研究

发布时间：2018-07-07 17:44

本文选题：苯并三氮唑 + Fenton　；参考：《浙江工业大学》2015年硕士论文

【摘要】：苯并三氮唑(benzotriazole,BTA)做为添加剂,广泛应用于许多领域。苯并三氮唑具有生物难降解性,会在环境中积累,对人类健康形成潜在的威胁。本文采用了Fenton协同强化超声-光催化降解苯并三氮唑,探究了反应条件对苯并三氮唑的降解影响,分析了Fenton、超声-光催化协同作用和BTA的降解动力学。采用超声-光催化降解BTA时,pH和TiO2的用量是关键因子,最佳条件p H=7,TiO2用量20 mg/L;当BTA初始浓度为20mg/L时,反应30min,降解率达到了80.59%,降解过程符合一级反应动力学,反应速率常数为0.0516。双氧水的投加可以提升超声-光催化降解BTA的降解率及反应速率,在最佳条件p H=3、TiO2 20mg/L、BTA初始浓度20mg/L、H2O2100mg/L、反应30min时,BTA降解率达到了100%,比不投加双氧水提高了24.62%,反应速率常数也由0.0478提高到了0.1774。超声-光催化-双氧水体系中,适量的TiO2就能够提升BTA的降解速率,过量的TiO2会对对紫外光产生屏蔽和散射作用,从而降低反应速率和降解率。Fenton能够明显强化超声-光催化降解BTA。Fenton与超声-光催化联用时,初始浓度为80 mg/L的苯并三氮唑在反应10 min后,降解率达到了100%。超声-光催化-Fenton降解BTA的最佳条件为:pH=3,H2O2浓度为60 mg/L,Fe2+浓度为10 mg/L,TiO2浓度为20mg/L,反应速率常数达到了0.635,为最佳条件下超声-光催化-双氧水的17倍、超声-光催化的83倍。超声-光催化-Fenton对BTA的降解率明显高于超声-光催化和Fenton对BTA的降解率的加和,超声-光催化-Fenton的协同因子S在反应过程中一直大于1,在6min的时候达到最大值S=1.52。
[Abstract]:Benzotriazoleazole (BTA) is widely used as an additive in many fields. Benztriazole is biodegradable and can accumulate in the environment and pose a potential threat to human health. In this paper, the effect of reaction conditions on the degradation of benzotriazole was investigated by using Fenton synergistic enhanced ultrasound photocatalytic degradation of benzotriazole, and the degradation kinetics of Fenton, ultrasonic photocatalysis and BTA were analyzed. The pH and the amount of TIO _ 2 were the key factors in the degradation of BTA by ultrasonic photocatalysis. The optimum conditions were as follows: the dosage of TIO _ 2 was 20 mg / L, and the degradation rate reached 80.59% at 30 min when the initial concentration of BTA was 20 mg / L. the degradation process was in accordance with the first-order reaction kinetics and the reaction rate constant was 0.0516. The addition of hydrogen peroxide can increase the degradation rate and reaction rate of ultrasonic photocatalytic degradation of BTA. Under the optimum conditions, the initial concentration of 20mg / L H _ 2O _ 2H _ 2O _ 2100mg / L, the degradation rate of 30min reached 100mg / L, 24.62% higher than that without adding hydrogen peroxide, and the reaction rate constant increased from 0.0478 to 0.1774. In supersonic photocatalytic hydrogen peroxide system, proper amount of TiO2 can increase the degradation rate of BTA, and excessive TiO2 can shield and scatter ultraviolet light. Therefore, when the reaction rate and degradation rate. Fenton were reduced, the degradation rate of BTA.Fenton with the initial concentration of 80 mg / L benzotriazole reached 100% after 10 min reaction. The optimum conditions for the degradation of BTA were as follows: the concentration of H _ 2O _ 2 was 60 mg 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) H _ (2) O _ (2) and the concentration of TIO _ (2) was 20 mg 路L ~ (-1) 路L ~ (-1), and the reaction rate constant was 0.635, which was 17 times as much as that of ultrasound-photocatalysis and 83 times as much as that of ultrasonic / photocatalysis under the optimum conditions. The degradation rate of ultrasound photocatalytic Fenton was significantly higher than that of ultrasonic photocatalysis and Fenton addition. The synergistic factor S of ultrasonic photocatalysis and Fenton was higher than 1 in the reaction process and reached the maximum value of S1. 52 at the time of 6min.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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