氧化铋复合材料的制备及其在光催化中的应用
发布时间：2018-11-09 11:53
【摘要】：尽管社会经济在不断地发展,但在此过程中导致的环境污染的问题也日益严重,其中水污染的治理尤其引人关注。近些年来,半导体光催化技术在污水处理领域展现出极大的应用前景,因而受到人们广泛的关注。Bi2O3由于优良的性质及广泛的应用性使其成为半导体光催化剂领域优先研究的材料之一。但是,Bi2O3在光催化过程中,其光生电子-空穴对的复合很快,这就严重影响了Bi2O3的光催化性能。鉴于此情况,降低Bi2O3的光生载流子复合几率、提高其光催化性能成为研究的热点。其中Bi2O3复合材料是一种行之有效的手段。本文通过共沉淀法制备了纳米Bi2O3,同时通过复合F-TiO2以及Ag2O合成Bi2O3/F-TiO2和Bi2O3/Ag2O复合物,使Bi2O3的光生电子-空穴对的复合得以抑制,光催化性能得以提高。主要研究内容如下：1.采用共沉淀法,通过加入氨水到Bi2O3前驱体溶液形成沉淀,再经过空气中热处理制得Bi2O3,同时研究了热处理温度对其光催化性能的影响。实验结果表明：(1)热处理温度对Bi2O3的形貌和光催化性能有着重要的影响；(2)当热处理温度为400℃时,合成的Bi2O3具有最佳的可见光催化性能,对甲基橙(Methyl Orange, MO)的降解率可达到86%(180 min)；(4)这种优异的光催化性能应该归因于Bi2O3良好的可见光吸收以及相对较低的光生载流子的复合。2.通过溶胶凝胶法合成F-TiO2,再将F-TiO2加入到Bi2O3前驱体溶液中,得到沉淀物,热处理后制得Bi2O3/F-TiO2复合物,并将其用于可见光催化领域。实验结果表明：(1)复合F-TiO2能够增强Bi2O3的光催化性能；(2)Bi2O3/F-TiO2光催化性能与复合物中F-TiO2的掺杂量有关；(3)当F-TiO2掺杂量为12wt.%时,Bi2O3/F-TiO2复合物对MO的光催化降解率达到最大值为96%(180分钟)；(4)光催化性能的增强主要归因于F-TiO2的引入增强了光吸收及降低了光生电子-空穴对的复合。3.采用共沉淀法合成Bi2O3,然后将Bi2O3加入到AgNO3溶液中,通过添加NaOH改变溶液的pH,从而合成Bi2O3/Ag2O复合物,并将其用于可见光催化领域。实验结果表明：(1)复合Ag2O能够明显增强Bi2O3的光催化性能；(2)Bi2O3/Ag2O光催化性能与复合物中Ag2O的掺杂量有关；(3)当溶液中AgNO3量为0.03mol时,Bi2O3/Ag2O复合物对MO的光催化降解率达到最大为91%(60min)；(4)光催化性能的增强主要归因于Ag2O的引入增强了光吸收及降低了光电子-空穴对的复合。
[Abstract]:In spite of the continuous development of social economy, the environmental pollution caused by this process is becoming more and more serious, especially the treatment of water pollution. In recent years, semiconductor photocatalytic technology has shown great application prospects in the field of wastewater treatment. Because of its excellent properties and wide application, Bi2O3 has become one of the priority materials in the field of semiconductor photocatalyst. However, in the process of photocatalysis, the photocatalytic properties of Bi2O3 are greatly affected by the combination of photogenerated electron-hole pairs. In view of this situation, reducing the recombination probability of photogenerated carriers and improving the photocatalytic performance of Bi2O3 has become a hot topic. Bi2O3 composite is an effective method. In this paper, nanometer Bi2O3, was prepared by coprecipitation and Bi2O3/F-TiO2 and Bi2O3/Ag2O complexes were synthesized by composite F-TiO2 and Ag2O. The photoelectron hole pair of Bi2O3 was inhibited and the photocatalytic performance was improved. The main contents are as follows: 1. The effect of heat treatment temperature on the photocatalytic properties of Bi2O3 precursor solution was studied by co-precipitation method by adding ammonia into the solution of Bi2O3, precursor and then heat treated in air. The experimental results show that: (1) the heat treatment temperature has an important effect on the morphology and photocatalytic performance of Bi2O3; (2) when the heat treatment temperature is 400 鈩，
本文编号：2320338
[Abstract]:In spite of the continuous development of social economy, the environmental pollution caused by this process is becoming more and more serious, especially the treatment of water pollution. In recent years, semiconductor photocatalytic technology has shown great application prospects in the field of wastewater treatment. Because of its excellent properties and wide application, Bi2O3 has become one of the priority materials in the field of semiconductor photocatalyst. However, in the process of photocatalysis, the photocatalytic properties of Bi2O3 are greatly affected by the combination of photogenerated electron-hole pairs. In view of this situation, reducing the recombination probability of photogenerated carriers and improving the photocatalytic performance of Bi2O3 has become a hot topic. Bi2O3 composite is an effective method. In this paper, nanometer Bi2O3, was prepared by coprecipitation and Bi2O3/F-TiO2 and Bi2O3/Ag2O complexes were synthesized by composite F-TiO2 and Ag2O. The photoelectron hole pair of Bi2O3 was inhibited and the photocatalytic performance was improved. The main contents are as follows: 1. The effect of heat treatment temperature on the photocatalytic properties of Bi2O3 precursor solution was studied by co-precipitation method by adding ammonia into the solution of Bi2O3, precursor and then heat treated in air. The experimental results show that: (1) the heat treatment temperature has an important effect on the morphology and photocatalytic performance of Bi2O3; (2) when the heat treatment temperature is 400 鈩，
本文编号：2320338
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