两种铋基光催化剂的制备及其降解罗丹明B的研究.doc

两种铋基光催化剂的制备及其降解罗丹明B的研究 Preparation of Two Bismuth Based Photocatalysts and Their Degradation of Rhodamine B 大连理工大学毕业论文（设计）格式规范 两种铋基光催化剂的制备及其降解罗丹明B的研究 - PAGE II - - PAGE I - 摘 要 当今人工合成染料，在造纸、工业染蜡、打字纸、皮革、羽毛制品的染色以及化妆品工业中广泛应用，对水环境造成了严重的污染，传统的污水处理技术已经无法跟上步伐，一种新型的、环境友好的治理染料污水的方式正受到人们的强烈的关注，即光降解技术，铋系物作为优质的可见光催化剂，也开始进入研究人员的视野。本论文采用一种操作相对简单的水热合成法，获得可见光催化剂Bi4V2O11、Bi4V2O11-CH4N2O、Bi4V2O11-CH4N2S和Bi2MoO6。在光催化实验之后，通过UV-1801型紫外可见分光光度计对污染物的去除率及反应动力学进行测定计算，证明了Bi4V2O11-CH4N2O，催化活性明显最强，相同时间内罗丹明B去除率是纯Bi4V2O11的1.75倍；通过PE Lambda 750型UV/VIS/NIR光谱仪、傅里叶红外仪对催化剂进行表征，证明了Bi4V2O11-CH4N2O有更宽的可见光吸收范围，且光吸收性质最好。以Bi(NO3)3·5H2O/Na2MoO4·2H2O为合成原料合成Bi2MoO6，再用KBH4对Bi2MoO6分别以0.1、0.2、0.5、0.8、1.0、1.2的摩尔比例进行还原操作，实验结果表明KBH4与Bi2MoO6的摩尔比为0.8时，还原产物的光催化活性最强，相同时间罗丹明B去除率是纯Bi2MoO6的1.83倍。根据结果，适当的添加剂以及还原摩尔比，可以有效提升催化剂活性，实现人工合成染料污水的高效治理。 关键词：水热法；铋基光催化剂；光催化降解；罗丹明B 两种铋基光催化剂的制备及其降解罗丹明B的研究 - PAGE IV - Preparation of Two Bismuth Based Photocatalysts and Their Degradation of Rhodamine B Abstract Nowadays, synthetic dyes are widely used in paper making, industrial wax dyeing, typing paper, leather and feather dyeing and cosmetics industries, causing serious pollution to the water environment. The traditional sewage treatment technology has been unable to keep up with the pace. A new environmentally friendly way to treat dyestuff wastewater is attracting people’s attention strongly, namely, the photodegradation technology, and bismuth series, as a high-quality visible light catalyst, has begun to enter the field of vision of researchers. In this paper, a relatively simle hydrothermal synthesis method is adopted to obtain visible light catalysts Bi4V2O11, Bi4V2O11-CH4N2O, Bi4V2O11-CH4N2S and Bi2MoO6. After the photocatalytic experiment, the removal rate and reaction kinetics of pollutants were determined by uv-1801 UV spectrophotometer. It was proved that Bi4V2O11-CH4N2O had the highest catalytic activity, and the removal rate of rhodamine B was 1.75 times that of pure Bi4V2O11 ,within the same time. The catalyst was ch