本文選題：苯并三氮唑 + Fenton��； 參考：《浙江工業(yè)大學(xué)》2015年碩士論文

【摘要】：苯并三氮唑(benzotriazole,BTA)做為添加劑,廣泛應(yīng)用于許多領(lǐng)域。苯并三氮唑具有生物難降解性,會(huì)在環(huán)境中積累,對(duì)人類健康形成潛在的威脅。本文采用了Fenton協(xié)同強(qiáng)化超聲-光催化降解苯并三氮唑,探究了反應(yīng)條件對(duì)苯并三氮唑的降解影響,分析了Fenton、超聲-光催化協(xié)同作用和BTA的降解動(dòng)力學(xué)。采用超聲-光催化降解BTA時(shí),pH和TiO2的用量是關(guān)鍵因子,最佳條件p H=7,TiO2用量20 mg/L;當(dāng)BTA初始濃度為20mg/L時(shí),反應(yīng)30min,降解率達(dá)到了80.59%,降解過程符合一級(jí)反應(yīng)動(dòng)力學(xué),反應(yīng)速率常數(shù)為0.0516。雙氧水的投加可以提升超聲-光催化降解BTA的降解率及反應(yīng)速率,在最佳條件p H=3、TiO2 20mg/L、BTA初始濃度20mg/L、H2O2100mg/L、反應(yīng)30min時(shí),BTA降解率達(dá)到了100%,比不投加雙氧水提高了24.62%,反應(yīng)速率常數(shù)也由0.0478提高到了0.1774。超聲-光催化-雙氧水體系中,適量的TiO2就能夠提升BTA的降解速率,過量的TiO2會(huì)對(duì)對(duì)紫外光產(chǎn)生屏蔽和散射作用,從而降低反應(yīng)速率和降解率。Fenton能夠明顯強(qiáng)化超聲-光催化降解BTA。Fenton與超聲-光催化聯(lián)用時(shí),初始濃度為80 mg/L的苯并三氮唑在反應(yīng)10 min后,降解率達(dá)到了100%。超聲-光催化-Fenton降解BTA的最佳條件為:pH=3,H2O2濃度為60 mg/L,Fe2+濃度為10 mg/L,TiO2濃度為20mg/L,反應(yīng)速率常數(shù)達(dá)到了0.635,為最佳條件下超聲-光催化-雙氧水的17倍、超聲-光催化的83倍。超聲-光催化-Fenton對(duì)BTA的降解率明顯高于超聲-光催化和Fenton對(duì)BTA的降解率的加和,超聲-光催化-Fenton的協(xié)同因子S在反應(yīng)過程中一直大于1,在6min的時(shí)候達(dá)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.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X703

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本文編號(hào)：2105744