纳米级光催化剂对双酚A光催化降解的研究
本文选题：双酚A 切入点：光催化降解 出处：《山东农业大学》2017年硕士论文
【摘要】：双酚A属于环境内分泌干扰物,普遍存在与环境中,可通过干扰生物或人体内天然激素的合成、分泌、运输、结合、反应和代谢等过程,从而对生物或人体的生殖、神经和免疫系统等的功能产生影响。TiO_2作为具有广泛应用前景的光催化剂,近些年来,一直是国内外研究的重点。CuO具有良好的化学稳定性、耐酸、耐碱、低毒、廉价,易于工业化大规模生产;但是CuO的导带电位的位置比H2O的还原电位更正,不能满足光解水产氢对光催化剂导带电位的要求。本文选用两种不同粒径TiO_2(Nano-TiO_2,TiO_2)、纳米CuO、碳纳米管负载CuO作为催化剂,研究双酚A光催化降解动力学,同时考察了TiO_2的量、反应液p H值、离子强度、双酚A溶液浓度各因素作用条件下的光催化性能。具体结果如下:两种TiO_2作用下,双酚A的光催化降解率均在48 h以后达到平衡,且存在显著的粒径效应。催化剂的投加量和双酚A浓度均影响双酚A的降解率。随着pH值的升高,双酚A的光催化降解率均逐渐降低。溶液介质中的离子强度抑制了双酚A光催化降解性,离子强度越高抑制效果越显著;且两种粒径TiO_2的响应基本一致。紫外线照射下,Nano-CuO和CuO/MWCNTs催化降解双酚A的平衡时间为24h;且CuO/MWCNTs的光催化降解性能显著高于Nano-CuO;Nano-CuO和CuO/MWCNTs的投加量和双酚A浓度均影响双酚A的降解率。随着电解质pH值升高双酚A的光催化降解率均逐渐降低,与TiO_2的趋势相同。离子强度对于催化剂的光催化降解性能具有一定的抑制作用;且Nano-CuO和CuO/MWCNTs的响应基本一致。
[Abstract]:Bisphenol A (BPA) belongs to environmental endocrine disruptors. It is common in the environment. It can be used to reproduce biological or human body by interfering with the synthesis, secretion, transportation, combination, reaction and metabolism of natural hormones. The function of nerve and immune system has an effect. TiO-2 is a photocatalyst with wide application prospect. In recent years, it has been the focus of research at home and abroad. CuO has good chemical stability, acid resistance, alkali resistance, low toxicity and low cost. It is easy to produce in a large industrial scale; but the position of conduction band potential of CuO is corrected compared with that of H 2O reduction potential. The photocatalytic degradation kinetics of bisphenol A was studied by using two different particle sizes of TIO _ 2 / TIO _ (2) O _ (2) O _ (2) TIO _ (2) O _ (2) and carbon nanotube supported CuO as catalysts to study the photocatalytic degradation kinetics of bisphenol A. The photocatalytic properties of the reaction solution under the conditions of pH value, ionic strength and concentration of bisphenol A solution were as follows: the photocatalytic degradation rate of bisphenol A reached equilibrium after 48 h under the action of two kinds of TiO_2. The addition of catalyst and the concentration of bisphenol A both affected the degradation rate of bisphenol A. with the increase of pH value, the degradation rate of bisphenol A was increased with the increase of pH value. The photocatalytic degradation rate of bisphenol A decreased gradually. The ionic strength in the solution inhibited the photocatalytic degradation of bisphenol A. the higher the ionic strength, the more obvious the inhibition effect was. The equilibrium time of photocatalytic degradation of bisphenol A by Nano-CuO and CuO/MWCNTs was 24 h, and the photocatalytic degradation performance of CuO/MWCNTs was significantly higher than that of Nano-CuO and CuO/MWCNTs and the concentration of bisphenol A. With the increase of pH value of electrolyte, the photocatalytic degradation rate of bisphenol A decreased gradually. The ionic strength has a certain inhibitory effect on the photocatalytic degradation of the catalyst, and the response of Nano-CuO and CuO/MWCNTs is basically the same.
【学位授予单位】：山东农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X505;O643.36
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