钼酸铋的制备、表征及其降解污染物性能的研究

发布时间：2018-03-02 15:40

本文选题：化催光　切入点：Bi_2MoO_6　出处：《大连海事大学》2017年硕士论文　论文类型：学位论文

【摘要】：光催化材料凭借其自身的优异性能在航运领域的应用得到广泛认可,如应用于载运工具运行过程中产生污染的处理以及预防等。光催化材料在这一领域的应用大大提高了人们对光能的利用率。传统的光催化剂为Ti02,但是Ti02禁带宽度较大约为3.2eV,只能在紫外光范围内响应。因此,人们开始将更多的精力放在寻找新型的半导体材料上,例如能高效的将太阳能转化为化学能并可以有效降解有机物的Bi_2MoO_6便是其中之一。Bi_2MoO_6禁带宽度较窄只有2.48eV,但是较高的电子空穴复合效率大大影响了 Bi_2MoO_6的光催化性能,为此人们开始探寻大量的方法对这一现象进行改进。在本实验中使用Ag/AgBr和g-C_3N_4两种物质对Bi_2MoO_6进行杂化以提升其光催化性能:1、在本实验工作内容中利用光还原法制备Ag/AgBr-Bi_2MoO_6复合材料,并对所合成的样品进行XRD、SEM、TEM、FT-IR、DRS以及电化学实验以检测所合成样品的晶体结构、形貌、物质组成以及性能。本实验为检测催化剂的光催化性能,以亚甲基蓝为模拟污染物进行降解。在实验过程中,为提高材料利用率,将粉转样品制备成膜。通过对实验数据的收集与分析,对钼酸铋光催化性能提升的机理进行推断。2、近年来g-C_3N_4以其优异的光催化性能而成为催化领域的研究热点,本实验中以超声合成法成功合成g-C_3N_4/Bi2Mo06复合材料,并同样以亚甲基蓝为模拟污染物对其进行降解用以检测g-C_3N_4/Bi2Mo06复合材料的光催化性能。同样的,经过对实验数据的收集、分析后推断出钼酸铋光催化性能提升机理。从实验数据中可以得出结论:Ag/AgBr和g-C_3N_4两种物质对Bi_2MoO_6的光催化性能均有提升,在形同情况下钼酸铋对降解亚甲基蓝的降解率分别提升8倍和1.78倍。
[Abstract]:Photocatalytic materials have been widely recognized for their excellent performance in the shipping field. The application of photocatalytic materials in this field has greatly improved the utilization of light energy. The traditional photocatalyst is Ti02, but the band gap of Ti02 is wide. The larger is about 3.2 EV, which can only respond in the range of ultraviolet light. People are starting to focus more on looking for new semiconductor materials, For example, Bi_2MoO_6, which can efficiently convert solar energy into chemical energy and effectively degrade organic matter, is one of them. Bi2MoO6 has a narrow band gap of only 2.48 EV, but higher electron hole recombination efficiency greatly affects the photocatalytic performance of Bi_2MoO_6. In this experiment, Ag/AgBr and g-C3N4 were used to hybrid Bi_2MoO_6 to improve its photocatalytic activity: 1. In this work, Ag/AgBr-Bi_2MoO_6 composites were prepared by photoreduction. The synthesized samples were tested by XRDX SEMTEMT-IRDRS and electrochemical experiments to detect the crystal structure, morphology, composition and performance of the synthesized samples. The purpose of this experiment was to test the photocatalytic properties of the catalysts. Methylene blue was used as the simulated pollutant to degrade. In order to improve the material utilization rate, the powder transfer sample was prepared into film. The experimental data were collected and analyzed. The mechanism of improving the photocatalytic performance of bismuth molybdate was inferred. In recent years, g-C _ 3N _ 4 has become a hot research area for its excellent photocatalytic performance. In this experiment, g-C _ 3N _ S _ 4 / Bi _ 2Mo06 composite was successfully synthesized by ultrasonic synthesis. It was also degraded by methylene blue as a simulated pollutant to detect the photocatalytic properties of the g-C _ s _ 3N _ 3N _ (4) / Bi _ 2Mo06 composite. Again, after collecting the experimental data, From the experimental data, it can be concluded that the photocatalytic activity of Bi_2MoO_6 can be improved by two kinds of substances: 1 / Ag / AgBr and g-C _ 3N _ S _ 4, and the mechanism of enhancement of photocatalytic activity of bismuth molybdate is deduced from the experimental data. In the same condition, the degradation rate of bismuth molybdate on methylene blue was increased by 8 times and 1.78 times, respectively.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;X505

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