用于降解含染料废水的钙钛矿光催化剂的特点研究_论文终结版.doc

诚 信 声 明 我声明，所呈交的毕业论文是本人在老师指导下进行的研究工作及取得的研究成果。据我查证，除了文中特别加以标注和致谢的地方外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含为获得其他教育机构的学位或证书而使用过的材料。我承诺，论文中的所有内容均真实、可信。 毕业论文作者签名： 签名日期： 年 月 日  用于降解含染料废水的钙钛矿光催化剂的特点研究 摘要 二十世纪，光催化技术有了飞速的发展，与此同时，如何利用催化剂也受到了广泛的关注。LaFeO3催化剂由于其具备高的催化性能，成为了光催化剂研究的热点。本文采用固相研磨法、红外辅助溶胶凝胶法、熟化研磨法和熔盐法四种方法制备了LaFeO3催化剂，探讨不同制备方法对LaFeO3光催化剂结构和性能的影响。用XRD和SEM对样品进行了表征。以酸性大红R为目标降解物，考察了催化剂的可见光光催化降解活性。实验结果表明：除了固相研磨法，其他三种方法均能制备单一的钙钛矿型LaFeO3催化剂，溶胶凝胶法制备的催化剂有最高的光催化活性，可见光照射下反应120 min，酸性大红R的脱色率达到30.8％，熟化研磨法制备的催化剂脱色率仅为9.7％，而熔盐法法制备的催化剂为14.6％。染液的初始浓度对降解的效果有一定的影响，10 mg/L的酸性大红R比20 mg/L和50 mg/L更容易被LaFeO3降解。光源对光催化实验的降解效果也有影响，本实验中紫外照射的反应效果不如可见光。 关键词 LaFeO3；可见光；酸性大红R；红外辅助溶胶凝胶法 Research on the photocatalytic decontamination of dyeing wastewater by perovskite-type oxide Abstract In the 20th century, photocatalytic technology has been rapidly developed and how to make use of the catalyst has been widespread concern. LaFeO3 catalysts were prepared by grinding method, infrared-assisted sol-gel, ripen-grinding and molten salt methods, aim to explore the effects of different preparation methods on structure and performance of LaFeO3 photocatalyst. The samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activities of different catalysts were investigated by utilizing acid scarlet as degradation agent under visible-light irradiation. The results showed that except grinding method, LaFeO3 prepared by the other methods all exhibited structure of perovskite. LaFeO3 prepared by infrared-assisted sol-gel exhibited the highest photocatalytic activity, and after 120 min photocatalytic reaction, about 30.86％ of acid scarlet was decolored, and for catalyst prepared by the ripen-grinding method, the decoloration ratio was only 9.7％, while for the sample prepared by molten salt method, the degradation was 14.6%. The difference of solutions original concentration can effect the result of reaction. Acid scarlet in 10 mg/L can be d