磷酸铋薄膜的光电催化及影响因素

发布时间：2018-04-21 15:45

本文选题：磷酸铋 + 薄膜　；参考：《暨南大学》2015年硕士论文

【摘要】：光催化降解水中有机污染物已成为环境保护工作中的重点研究课题。近年来,新型的非金属含氧酸盐型光催化剂已越来越受人关注,而磷酸铋(Bi PO4)因其自身结构的特点而在光催化方面具有巨大的应用潜力。光催化目前存在的两大主要问题分别是光生电子和空穴的高重组率以及反应后催化剂和溶液体系难以分离。而光电催化因引入外加偏压,可有效促使光生电子和空穴的分离和迁移;另一方面,催化剂必须负载在一定的充当电极的基底上,从而在反应后能方便地与溶液体系分离。近年来光电催化的相关报道越来越多,但系统的研究还比较缺乏,关于光电催化影响因素的研究还比较少。本文用水热法合成了Bi PO4粉末,再通过浸渍涂布法在ITO玻璃上制备了Bi PO4薄膜。由SEM、TEM、XRD等方法表征了Bi PO4薄膜的形貌和结构,用电化学阻抗(EIS)、光电流响应等方法分析了外加偏压和光生电子空穴分离和迁移的关系。通过光催化、电氧化、光电催化降解亚甲基蓝的实验说明了光电催化对催化降解效果的大幅提高,并考察了p H、电解质浓度和种类对光电催化的影响。
[Abstract]:Photocatalytic degradation of organic pollutants in water has become an important research topic in environmental protection. In recent years, new non-metallic oxygenated photocatalysts have attracted more and more attention, while bismuth phosphate bismuth bismuth phosphate (Bi PO 4) has great application potential in photocatalysis because of its own structural characteristics. The two main problems of photocatalysis at present are the high recombination rate of photogenerated electrons and holes and the difficulty of separating the catalyst from the solution system after the reaction. Photocatalysis can effectively promote the separation and migration of photogenerated electrons and holes due to the introduction of applied bias voltage. On the other hand, the catalyst must be supported on a certain substrate to act as the electrode, so that it can be conveniently separated from the solution system after the reaction. In recent years, there are more and more reports on photocatalysis, but the systematic research is still lacking, and the research on the influencing factors of photocatalysis is still rare. In this paper, Bi PO4 powder was synthesized by hydrothermal method and Bi PO4 thin film was prepared on ITO glass by impregnation coating method. The morphology and structure of Bi PO4 thin films were characterized by means of SEMMO-TEMMO-XRD. The relationship between the bias voltage and the hole separation and migration of photogenerated electrons was analyzed by electrochemical impedance spectroscopy (EIS) and photocurrent response. The photocatalytic degradation of methylene blue by photocatalysis, electrooxidation and photocatalysis showed that the photocatalytic degradation of methylene blue was greatly improved, and the effects of pH, electrolyte concentration and type on photocatalytic degradation were investigated.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ135.32;TB383.2

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