无机半导体基纳米复合结构的合成及光催化性质研究

发布时间：2018-05-02 10:01

本文选题：氧化锌 + 钨酸铋　；参考：《安徽师范大学》2017年硕士论文

【摘要】：半导体基纳米复合结构通过促进界面电荷转移过程、增进电荷分离提供一条调节半导体光催化剂性能的有效途径。本论文旨在通过化学液相方法合成无机半导体基纳米复合结构,利用结构诱导增进光催化降解有机染料活性。本论文主要合成了ZnO纳米棒/SrTiO_3介孔纳米片、纳米片组成的花状Bi_2WO_6/Ag纳米粒子、介孔纳米片组成的花状SrTi O_3/Ag纳米粒子纳米复合结构材料,并对合成的纳米复合结构光催化降解有机染料性能进行了详细的研究。本论文主要内容和结果归纳如下:1.以1.6-己二胺作为配位剂,利用化学液相沉积和后续煅烧方法合成ZnO纳米棒/SrTiO_3介孔纳米片阵列纳米结构。由于ZnO和SrTiO_3界面电荷的相互转移,ZnO纳米棒/SrTiO_3介孔纳米片复合结构紫外光催化降解有机染料罗丹明B和甲基橙活性比ZnO纳米棒显著提高。2.以1.6-己二胺作为配位剂,溶剂热合成纳米片组成的花状Bi_2WO_6。进一步以抗坏血酸为还原剂,在冰浴条件下,使Ag纳米粒子沉积在Bi_2WO_6纳米片上获得纳米片组成的花状Bi_2WO_6/Ag纳米粒子复合结构。由于Ag纳米粒子的等离子效应,增进可见光吸收并促进Bi_2WO_6表面的光生电子-空穴对的分离,使纳米片组成的花状Bi_2WO_6/Ag纳米粒子复合结构光催化降解有机染料活性显著增强。3.通过化学液相沉积和后续煅烧获得介孔纳米片组成的花状SrTiO_3结构。进一步用室温液相沉积法获得介孔纳米片组成的花状SrTiO_3/Ag纳米粒子复合纳米结构。基于Ag纳米粒子的等离子效应,介孔纳米片组成的花状SrTiO_3/Ag纳米粒子复合结构可见光催化降解甲基橙活性显著提高。此外,由于高度均匀分散的Ag纳米结构,所合成的SrTiO_3/Ag复合纳米结构能够高效催化还原4-硝基苯酚。
[Abstract]:Semiconductor based nanocomposites provide an effective way to regulate the performance of semiconductor photocatalysts by facilitating the interfacial charge transfer process and enhancing charge separation. The aim of this thesis is to synthesize inorganic semiconductor based nanocomposites by chemical liquid phase method and to improve the photocatalytic degradation of organic dyes by structure induction. In this thesis, ZnO nanorods / SrTiO3 mesoporous nanostructures, flower-like Bi_2WO_6/Ag nanoparticles, mesoporous SrTi O_3/Ag nanocrystalline nanocomposite materials were synthesized. The photocatalytic degradation of organic dyes with nanocomposite structure was studied in detail. The main contents and results of this thesis are summarized as follows: 1. The nanostructures of ZnO nanorods / SrTiO3 mesoporous nanoarrays were synthesized by chemical liquid deposition and subsequent calcination with 1.6- hexanediamine as the coordination agent. Due to the interfacial charge transfer between ZnO and SrTiO_3, the photocatalytic degradation of organic dyes Rhodamine B and methyl orange by UV photocatalytic degradation was significantly higher than that of ZnO nanorods. Using 1.6- hexane diamine as the coordination agent, the flower-like Bi2WOs _ 6 was synthesized by solvothermal synthesis. Furthermore, using ascorbic acid as reducing agent, Ag nanoparticles were deposited on Bi_2WO_6 nanoparticles in ice bath to obtain the flower-like Bi_2WO_6/Ag nanoparticles composite structure. Due to the plasma effect of Ag nanoparticles, the absorption of visible light and the separation of photogenerated electron-hole pairs on the surface of Bi_2WO_6 were enhanced, and the photocatalytic degradation activity of organic dyes was significantly enhanced by the flower-like Bi_2WO_6/Ag nanoparticles. The flower-like SrTiO_3 structure of mesoporous nanoparticles was obtained by chemical liquid deposition and subsequent calcination. Furthermore, the flower-like SrTiO_3/Ag nanostructures composed of mesoporous nanoparticles were obtained by liquid deposition at room temperature. Based on the plasma effect of Ag nanoparticles, the catalytic activity of mesoporous SrTiO_3/Ag nanoparticles for methyl orange degradation by visible light was improved significantly. In addition, due to highly uniformly dispersed Ag nanostructures, the synthesized SrTiO_3/Ag nanostructures can efficiently catalyze the reduction of 4-nitrophenol.
【学位授予单位】：安徽师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;O644.1

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