【作者】 钟耀；

【导师】 王建中；

【作者基本信息】 西北师范大学 ， 环境科学， 2009， 硕士

【摘要】 苯胺是一种对环境有较大危害的污染物,又是一种化学工业中广泛使用的芳香族化合物。随着经济的发展,对苯胺的需求量越来越大,排入环境的苯胺的量也越来越多,对环境造成的危害也越来越大,开展对苯胺废水处理的研究有重要的意义。电催化氧化法因其特有的优点,现已成为水处理领域研究的热点。实验采用自制实验装置,用碳棒作为电极,对苯胺模拟废水进行电催化氧化。本文设计正交实验研究了电压、pH、电解质和电解时间对苯胺降解率的影响,结果表明电压对苯胺的去除影响最大,pH的影响次之,再次是电解时间,而电解质的投加量对苯胺降解率的影响不大。初步确定电催化氧化法处理苯胺废水的优化条件为:电解电压为8V;pH为8;电解时间为80min,Na₂SO₄浓度为12g·L^-1。分析苯胺电催化氧化过程中可能产生的中间物质,研究苯胺电催化氧化的机理是本文的又一研究内容,在正交实验基础上,确定电催化氧化苯胺模拟废水的条件:电解电压为6V;pH为8;Na₂SO₄浓度为9g·L^-1。每隔一定时间取样,实验将标准物质的保留时间与电解液中未知组分的保留时间做比较,在前人研究的基础上,根据有关电化学反应理论,明确检测到用碳电极在一定条件下电催化氧化苯胺废水会产生对苯酚、对苯琨、顺丁烯二酸、乙二酸等物质。在前人研究的基础上,根据有关电化学反应理论,通过中间产物推断出苯胺在此电催化氧化条件下其降解途径可能为:苯胺→对苯二酚→对苯醌→顺丁烯二酸→乙二酸→二氧化碳+水。通过研究苯胺电催化氧化降解的途径和机理,我们有望能够较为容易的控制苯胺的反应历程,将其彻底氧化降解,有助于实际处理含有苯胺的有机物废水。更多还原

【Abstract】 Aniline is an important chemical which wildly used in the chemical industry.It is also a bio-refractory organic in wastewater.With the economical development,the demands of aniline is bigger and bigger,more and more aniline is released to the environment and damaged to the environment.For these reasons,there are numerous studies devoted to the development of effective procedures for the treatment of aniline-containing wastewater.Electro-catalysis oxidation of their unique advantages,which has become a hot research field of water treatment now.The experiments used homemade experimental device,taking the carbon stick as electrodes,electro-catalysis oxidation the simulation wastewater of Aniline.From the result of orthogonal experiment,the voltage effect is maximal,the pH effect takes second place,electrolysis time once again,but Electrolyte effect is comparatively faint.The best reaction condition:Electrolysis voltage is 8 V,pH is 8, electrolysis time is 80 mins,Na₂SO₄ is 12 g·L^-1.According to orthogonal experiment,The reaction condition:Electrolysis voltage is 6V,pH is 8,electrolysis time is 60 mins,Na₂SO₄ is 9 g·L^-1.in HPLC analyzing process,making comparison with the unknown component peak’s retention time and the standard substance retention time,to determine intermediate product of electro-catalysis oxidation degradation aniline,and infers oxidation degradation way of aniline,the intermediate products of electro-catalysis oxidation degradation Aniline（according to retention time order in HPLC chromatogram）:Oxalic acid、Maleic acid、Hydroquinone、p-Quinone.Based on others’ researches and theory of Electrochemical reaction,Deduce those degradation approach may be aniline here under electro-catalysis oxide condition by the intermediate product of electro-catalysis oxidation degradation styrene:Aniline→Hydroquinone→p-Quinone→Maleic acid→Oxalic acid.Through research the way and mechanism of electro-catalysis oxidation degradation aniline,We expected to be relatively easy to control the reaction course of aniline to oxidative degradation it completely,which help us to deal with containing aniline organic pollutants wastewater in practical.更多还原