新型钨酸铋基复合光催化材料的性能研究及其表征分析
发布时间：2018-07-29 19:08
【摘要】：最近,由于全球环境污染问题日趋严重以及能源短缺问题的突显使它们成为全球共同关心的问题。半导体光催化技术由于具有对污染物降解效率高、重复利用率高、操作过程简单、对环境无污染等诸多优异的特点,让其在许多方面得到广泛的使用,如光催化制氢、净化空气环境和污水处理等。因此,光催化技术很有希望作为一种有效的解决环境污染和能源短缺的方法。我们知道传统催化剂如Ti02只能吸收紫外光,且其禁带宽度较大,这极大的限制了其应用,所以很多科研工作者开始把注意力集中于可见光响应型催化剂的研究上。近来,Bi2W06由于可以吸收可见光并且对有机污染物具有较高的降解活性而受到极大的关注。并且,Bi2W06是一种非常有潜力的光催化剂,这是因为其光学性能和物理化学性能较好。本文利用Bi2WO6作为研究对象,采用BN、MoS2和GQDs对其修饰改性,以期得到具有较高催化活性的Bi2WO6基光催化剂系统。本文的主要研究内容如下:(1)采用浸渍法成功地合成出了 BN/Bi2W06复合催化剂。并利用X射线衍射(XRD)、X射线光电子能谱(XPS)等多种分析手段来阐明其结构、形貌以及光学性能。采用罗丹明B(RhB)溶液来探究BN/Bi2W06复合催化剂的光催化活性。光催化降解的实验结果显示,BN/Bi2W06复合催化剂对目标污染物表现出较高的光催化活性。并且,当引入3wt%的BN时,BN/Bi2W06复合物获得最高的活性,BN/Bi2W06复合物在可见光照下100 min内对RhB的降解效率可达到98.2%。对BN/Bi2W06复合催化剂的光电流测试结果显示:引入BN之后,BN/Bi2W06复合物的光电流强度明显高于单体Bi2W06,这说明引入BN之后,在光催化反应过程中电子和空穴能够获得很好的分离。最后提出了 BN/Bi2W06复合催化剂可能的光催化机理。(2)采用水热法分别合成出了单体MoS2和单体Bi2W06,MoS2/Bi2W06复合物是利用浸渍法合成出的。并利用XRD、XPS等多种分析手段来阐明其结构、形貌以及光学性能。实验中采用亚甲基蓝(MB)溶液作为目标污染物来测试MoS2/Bi2W06复合催化剂的光催化活性。实验结果表明,引入MoS2后,MoS2/Bi2W06复合催化剂的光催化活性得到提高,且MoS2/Bi2W06复合催化剂对MB的降解效率达到最高时,此时MoS2的质量分数为3 wt%。对MoS2/Bi2W06复合催化剂的光电流测试结果表明,引入MoS2之后,MoS2/Bi2W06复合催化剂的光电流强度明显高于单体Bi2W06,这说明引入MoS2之后,在光催化反应过程中电子和空穴能够获得很好的分离。最后提出了 MoS2/Bi2W06复合催化剂可能的光催化机理。(3)采用芘的硝化制备出了石墨烯量子点(GQDs),然后在合成Bi2W06的过程中加入一定量的GQDs,水热合成出了 GQDs/Bi2W06复合光催化剂。并利用XRD、XPS等多种分析手段来阐明其结构、形貌以及光学性能。实验中采用RhB溶液作为目标污染物来测试GQDs/Bi2W06复合催化剂的光催化活性。光催化降解实验结果显示,GQDs/Bi2W06复合催化剂对RhB的降解效率较单体Bi2W06有明显提升,当GQDs的质量分数为2wt%时,GQDs/Bi2W06复合催化剂对RhB的降解效率最高。对GQDs/Bi2W06复合催化剂的光电流测试结果表明:引入GQDs之后,GQDs/Bi2W06复合催化剂的光电流强度明显高于单体Bi2W06,这说明引入GQDs之后,在光催化反应过程中电子和空穴能够获得很好的分离。最后提出了 GQDs/Bi2W06复合催化剂可能的光催化机理。
[Abstract]:Recently, the global environmental pollution problem is becoming more and more serious and the problem of energy shortage has made them a global concern. Semiconductor photocatalytic technology has many excellent characteristics, such as high efficiency of degradation of pollutants, high reuse rate, simple operation process, no pollution to the environment, and so on. Widely used, such as photocatalytic hydrogen production, purification of air environment and sewage treatment. Therefore, photocatalytic technology is promising to be an effective way to solve environmental pollution and energy shortage. We know that traditional catalysts such as Ti02 can only absorb ultraviolet light, and its band gap is larger, which greatly limits its application, so many families are limited. Researchers have begun to focus on the study of visible light responsive catalysts. Recently, Bi2W06 has attracted great attention because it can absorb visible light and have high degradation activity for organic pollutants. And Bi2W06 is a very promising photocatalyst because of its optical and physical and chemical properties. Good. This paper uses Bi2WO6 as the research object, using BN, MoS2 and GQDs to modify the modified Bi2WO6 based photocatalyst system with high catalytic activity. The main contents of this paper are as follows: (1) the BN/Bi2W06 composite catalyst was successfully synthesized by impregnation and X ray diffraction (XRD), X ray photoelectron spectroscopy (XP). S) and other analytical methods to clarify its structure, morphology and optical properties. Using Luo Danming B (RhB) solution to explore the photocatalytic activity of the BN/Bi2W06 composite catalyst. The experimental results of photocatalytic degradation showed that the BN/Bi2W06 composite catalyst showed high photocatalytic activity to the target pollutants. And, when the 3wt%'s BN was introduced, BN/Bi2W06 was introduced. The composite obtained the highest activity. The degradation efficiency of BN/Bi2W06 complex in 100 min under visible light can reach 98.2%. to BN/Bi2W06 composite catalyst. The results of the photo current test of BN/Bi2W06 composite catalyst show that after the introduction of BN, the photocurrent strength of the BN/Bi2W06 complex is obviously higher than that of the monomer Bi2W06, which shows that the introduction of BN is in the process of photocatalytic reaction. The electrons and holes can be separated well. Finally, the possible photocatalytic mechanism of the BN/Bi2W06 composite catalyst is proposed. (2) the monomer MoS2 and the monomer Bi2W06 are synthesized by the hydrothermal method. The MoS2/Bi2W06 complex is synthesized by the impregnation method. The structure, morphology and optical properties of the composite are illustrated by a variety of analytical means such as XRD, XPS and so on. Methylene blue (MB) solution is used as the target pollutant to test the photocatalytic activity of the MoS2/Bi2W06 composite catalyst. The experimental results show that the photocatalytic activity of the MoS2/Bi2W06 composite catalyst is improved after the introduction of MoS2, and the degradation efficiency of the MoS2/Bi2W06 composite catalyst for MB is the highest, and the mass fraction of MoS2 is at this time. The photocurrent test results of 3 wt%. for MoS2/Bi2W06 composite catalysts show that the photocurrent strength of the MoS2/Bi2W06 composite catalyst is obviously higher than that of the monomer Bi2W06 after the introduction of MoS2. This shows that the electron and hole can be well separated in the process of photocatalytic reaction after the introduction of MoS2. Finally, the possible MoS2/Bi2W06 composite catalyst is proposed. The mechanism of photocatalytic activity. (3) the graphene quantum dots (GQDs) was prepared by nitrification of pyrene, and a certain amount of GQDs was added to the synthesis of Bi2W06. The GQDs/Bi2W06 composite photocatalyst was synthesized by hydrothermal synthesis. The structure, shape and optical properties of the GQDs/Bi2W06 composite were clarified with XRD, XPS and other analytical means. RhB solution was used as the target pollution in the experiment. The photocatalytic activity of the GQDs/Bi2W06 composite catalyst was tested by the dye. The results of photocatalytic degradation showed that the degradation efficiency of RhB was obviously enhanced by the GQDs/Bi2W06 composite catalyst than that of the monomer Bi2W06. When the mass fraction of GQDs was 2wt%, the degradation efficiency of the GQDs/Bi2W06 composite catalyst to RhB was the highest. The flow test results show that after the introduction of GQDs, the photocurrent strength of the GQDs/Bi2W06 composite catalyst is significantly higher than that of the monomer Bi2W06, which shows that after the introduction of GQDs, the electrons and holes can be well separated during the photocatalytic reaction. Finally, the possible photocatalytic mechanism of the GQDs/Bi2W06 composite catalyst is proposed.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X505
本文编号：2153706
[Abstract]:Recently, the global environmental pollution problem is becoming more and more serious and the problem of energy shortage has made them a global concern. Semiconductor photocatalytic technology has many excellent characteristics, such as high efficiency of degradation of pollutants, high reuse rate, simple operation process, no pollution to the environment, and so on. Widely used, such as photocatalytic hydrogen production, purification of air environment and sewage treatment. Therefore, photocatalytic technology is promising to be an effective way to solve environmental pollution and energy shortage. We know that traditional catalysts such as Ti02 can only absorb ultraviolet light, and its band gap is larger, which greatly limits its application, so many families are limited. Researchers have begun to focus on the study of visible light responsive catalysts. Recently, Bi2W06 has attracted great attention because it can absorb visible light and have high degradation activity for organic pollutants. And Bi2W06 is a very promising photocatalyst because of its optical and physical and chemical properties. Good. This paper uses Bi2WO6 as the research object, using BN, MoS2 and GQDs to modify the modified Bi2WO6 based photocatalyst system with high catalytic activity. The main contents of this paper are as follows: (1) the BN/Bi2W06 composite catalyst was successfully synthesized by impregnation and X ray diffraction (XRD), X ray photoelectron spectroscopy (XP). S) and other analytical methods to clarify its structure, morphology and optical properties. Using Luo Danming B (RhB) solution to explore the photocatalytic activity of the BN/Bi2W06 composite catalyst. The experimental results of photocatalytic degradation showed that the BN/Bi2W06 composite catalyst showed high photocatalytic activity to the target pollutants. And, when the 3wt%'s BN was introduced, BN/Bi2W06 was introduced. The composite obtained the highest activity. The degradation efficiency of BN/Bi2W06 complex in 100 min under visible light can reach 98.2%. to BN/Bi2W06 composite catalyst. The results of the photo current test of BN/Bi2W06 composite catalyst show that after the introduction of BN, the photocurrent strength of the BN/Bi2W06 complex is obviously higher than that of the monomer Bi2W06, which shows that the introduction of BN is in the process of photocatalytic reaction. The electrons and holes can be separated well. Finally, the possible photocatalytic mechanism of the BN/Bi2W06 composite catalyst is proposed. (2) the monomer MoS2 and the monomer Bi2W06 are synthesized by the hydrothermal method. The MoS2/Bi2W06 complex is synthesized by the impregnation method. The structure, morphology and optical properties of the composite are illustrated by a variety of analytical means such as XRD, XPS and so on. Methylene blue (MB) solution is used as the target pollutant to test the photocatalytic activity of the MoS2/Bi2W06 composite catalyst. The experimental results show that the photocatalytic activity of the MoS2/Bi2W06 composite catalyst is improved after the introduction of MoS2, and the degradation efficiency of the MoS2/Bi2W06 composite catalyst for MB is the highest, and the mass fraction of MoS2 is at this time. The photocurrent test results of 3 wt%. for MoS2/Bi2W06 composite catalysts show that the photocurrent strength of the MoS2/Bi2W06 composite catalyst is obviously higher than that of the monomer Bi2W06 after the introduction of MoS2. This shows that the electron and hole can be well separated in the process of photocatalytic reaction after the introduction of MoS2. Finally, the possible MoS2/Bi2W06 composite catalyst is proposed. The mechanism of photocatalytic activity. (3) the graphene quantum dots (GQDs) was prepared by nitrification of pyrene, and a certain amount of GQDs was added to the synthesis of Bi2W06. The GQDs/Bi2W06 composite photocatalyst was synthesized by hydrothermal synthesis. The structure, shape and optical properties of the GQDs/Bi2W06 composite were clarified with XRD, XPS and other analytical means. RhB solution was used as the target pollution in the experiment. The photocatalytic activity of the GQDs/Bi2W06 composite catalyst was tested by the dye. The results of photocatalytic degradation showed that the degradation efficiency of RhB was obviously enhanced by the GQDs/Bi2W06 composite catalyst than that of the monomer Bi2W06. When the mass fraction of GQDs was 2wt%, the degradation efficiency of the GQDs/Bi2W06 composite catalyst to RhB was the highest. The flow test results show that after the introduction of GQDs, the photocurrent strength of the GQDs/Bi2W06 composite catalyst is significantly higher than that of the monomer Bi2W06, which shows that after the introduction of GQDs, the electrons and holes can be well separated during the photocatalytic reaction. Finally, the possible photocatalytic mechanism of the GQDs/Bi2W06 composite catalyst is proposed.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X505
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