以铁-凹凸棒土为模版合成聚苯胺及其应用于阿特拉津降解的研究

发布时间：2018-03-19 21:45

本文选题：凹凸棒土　切入点：类芬顿反应　出处：《南京大学》2017年硕士论文　论文类型：学位论文

【摘要】：导电聚合物聚苯胺由于其可以提高一些金属离子的催化活性收到广泛关注;类芬顿反应体系是一种可以降解水中有机污染物的高级氧化方法;凹凸棒土是一种环境友好,结构稳定,价格低廉的粘土矿物,适合作为催化剂载体。本文以铁离子饱和的凹凸棒土为模板,开发了一种新型的化学气相沉积法合成了铁-凹凸棒土-聚苯胺复合材料,通过X射线衍射、X射线光电子能谱、红外光谱、拉曼光谱等手段对制备材料进行了表征。确定了在凹凸棒土在合成材料的过程中晶体结构未发生变化,并且在凹凸棒土模板上合成了聚苯胺。通过化学计算模拟了聚苯胺在凹凸棒土孔道间的聚合过程。本研究选取阿特拉津为目标污染物,研究了聚苯胺的合成对铁离子饱和凹凸棒土催化类芬顿反应对污染物在矿物表面吸附和降解过程的影响。研究发现,凹凸棒土孔道间的Fe(Ⅲ)可以被苯胺还原为Fe(Ⅱ),从而大大提高类芬顿反应速率。此外,聚苯胺在酸性条件下的导电性以及对阿特拉津的π-π吸附也对阿特拉津的降解起到促进作用。铁-凹凸棒土-聚苯胺(Fe(Ⅲ)-ATTP-ANI350)相比于铁离子饱和凹凸棒土(Fe(Ⅲ)-ATTP)降解阿特拉津效率提高近150倍。实验结果表明,铁-凹凸棒土-聚苯胺复合材料可以通过静止沉淀进行分离,并在酸性条件下重复循环使用6次后铁元素流失仅有1.5%,降低了环境应用中造成二次污染物的风险。
[Abstract]:Due to the conductive polymer polyaniline can improve the catalytic activity of some metal ions received widespread attention; Fenton reaction system is a kind of advanced oxidation method can degrade organic pollutants in water; attapulgite is a kind of environmental friendly, stable structure, clay minerals of low price, suitable as a catalyst carrier. The iron ion saturation Attapulgite as template, developed a new type of chemical vapor deposition method to synthesize iron - attapulgite PANI composite materials by X ray diffraction, X ray photoelectron spectroscopy, infrared spectroscopy, Raman spectroscopy of the prepared materials were characterized. In the process of attapulgite in synthetic materials the crystal structure has not changed is determined, and the synthesis of Polyaniline in attapulgite template. To simulate the process of polymerization of Polyaniline in attapulgite pore between through chemical calculation in this research. Selection of atrazine as the target pollutant, studied the synthesis of polyaniline on iron saturated attapulgite catalytic class Fenton reaction of the pollutants in the influence of mineral surface adsorption and degradation process. The study found that attapulgite pore between Fe (III) aniline can be reduced to Fe (II), thus greatly improve the reaction rate of Fenton. In addition, the conductive polyaniline in acidic conditions and atrazine on tt-tt adsorption also promote the degradation of atrazine. Iron - attapulgite - polyaniline (Fe (III) -ATTP-ANI350) compared to the iron saturation of attapulgite (Fe (III) -ATTP) atrazine degradation efficiency is raised 150 times. The experimental results show that iron - Attapulgite PANI composite material by static precipitation separation, and in acidic conditions used repeatedly after 6 times of iron loss is only 1.5%, reduced the application environment The risk of two pollutants.

【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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