硫化物纳米复合材料的合成及其光催化性质研究

发布时间：2018-11-08 13:18

【摘要】：金属硫化物纳米材料因其独特的物理和化学性质,在电池、传感器、光催化等领域引起了广泛的关注。但单一组成的纳米材料在各方面的应用上存在局限性,不能满足大范围应用的要求,研究者们通过把两种或几种纳米材料复合,从而优化纳米材料的性质,并且取得了一定的成果。纳米材料的组成和形貌对性质起着重要的作用,因此纳米材料的合成方法成为研究纳米材料的重要任务之一。对于纳米材料的合成方法,目前最为常见的方法为溶剂热法。近十年来,采用胶体法合成金属硫化物纳米材料展现出了很好的发展趋势。本文使用胶体合成法,以油胺、油酸、正十二硫醇为溶剂,在温和的条件下合成了几种硫化物纳米复合材料,并对它们的光催化性质进行了研究。本文的主要研究内容包括：1.一步法合成石墨烯状Co3S4负载Ag2S纳米复合物及其光催化性质研究以油胺和正十二硫醇为溶剂,使用二乙基二硫代氨基甲酸银Ag(S2CNEt2);和Co(NO3)2·6H2O为反应物,在油胺和正十二硫醇溶液中通过热分解制得石墨烯状的C03S4负载Ag2S纳米复合物。相比较之前文献报道的晶种生长法与催化法更为简单,利用X射线衍射仪(XRD),透射电子显微镜(TEM)和高分辨透射电子显微镜(HRTEM),紫外可见分光光度计(UV-Vis)等分析测试手段对所得产物进行表征,而且制备的样品在可见光下催化降解亚甲基蓝和甲基橙的实验中,表现出很好的催化活性、稳定性和可再利用性。同时我们对石墨烯状C03S4负载Ag2S纳米复合物的光催化机理也进行了探讨。2. Au/Cu1.94S/ZnS纳米复合物的制备及光催化性质研究采用胶体合成法,以油胺为溶剂,CuI和二乙基二硫代氨基甲酸锌[Zn(S2CNEt2)2]为原料制备出Cu1.94S/ZnS纳米复合物,然后负载Au纳米粒子,制备了Au/Cui.94S/ZnS三元纳米复合物,利用X射线衍射仪(XRD),透射电子显微镜(TEM),紫外可见分光光度计(UV-Vis)等分析测试手段对所得产物进行表征,考察了可见光下Au/Cui.94S/ZnS纳米复合物对染料RhB的光催化降解性质。结果显示：Au/Cui.94S/ZnS纳米复合物具有优异的光催化降解性能,同时我们对Au/Cu1.94S/ZnS纳米复合物的光催化机理也进行了探讨。3. Ag2S/ZnS纳米复合物的合成及其光催化性质研究以油胺、正十二硫醇、油酸混合液为溶剂,以二乙基二硫代氨基甲酸银Ag(S2CNEt2)和二乙基二硫代氨基甲酸锌Zn(S2CNEt2)2为反应物,通过热分解生成Ag2S/ZnS的纳米复合物,利用x射线衍射仪(xRD),透射电子显微镜(TEM),紫外可见分光光度计(UV-Vis)等分析测试手段对所得产物进行表征。在实验过程中我们发现溶剂对产物形貌有着重要的影响。此外,我们还研究了Ag2S/ZnS纳米复合物在可见光下对罗丹明B溶液的光催化降解作用,结果表明我们所制备的纳米复合物具有很好的催化活性,同时我们也对Ag2S/ZnS纳米复合物的光催化机理进行了探讨。
[Abstract]:Metal sulfide nanomaterials have attracted wide attention in battery, sensor, photocatalysis and other fields because of their unique physical and chemical properties. However, the single-component nanomaterials are limited in various applications and can not meet the requirements of a wide range of applications. Researchers optimize the properties of nanomaterials by combining two or more nanomaterials. And achieved certain results. The composition and morphology of nanomaterials play an important role in the properties, so the synthesis of nanomaterials has become one of the important tasks in the study of nanomaterials. The solvothermal method is the most common method for the synthesis of nanomaterials. In recent ten years, colloidal synthesis of metal sulfide nanomaterials has shown a good development trend. In this paper, several kinds of sulfide nanocomposites were synthesized under mild conditions with oleamine, oleic acid and n-dodecanethanol as solvents by colloidal synthesis, and their photocatalytic properties were studied. The main contents of this paper are as follows: 1. One-step synthesis of graphene Co3S4 supported Ag2S nanocomposites and their photocatalytic properties; using oleamine and n-dodecanediol as solvents, silver diethyldithiocarbamate (S2CNEt2) was used. With Co (NO3) 2 6H2O as reactant, graphene C03S4 supported Ag2S nanocomposites were prepared by thermal decomposition in oleamine and dodecanethanol solution. Compared with the methods reported in previous literatures, the method of seed growth is simpler than the catalytic method. X-ray diffractometer (XRD), transmission electron microscope (TEM) and high resolution transmission electron microscope (HRTEM),) are used. The products were characterized by UV-Vis spectrophotometer (UV-Vis) and the prepared samples showed good catalytic activity in the degradation of methylene blue and methyl orange under visible light. Stability and reusability. At the same time, we also discussed the photocatalytic mechanism of graphene C03S4 supported Ag2S nanocomposites. 2. Preparation and photocatalytic Properties of Au/Cu1.94S/ZnS Nanocomposites the nanometer Cu1.94S/ZnS nanocomposites were prepared by colloidal synthesis using oleamine as solvent CuI and zinc diethyldithiocarbamate [Zn (S2CNEt2) 2] as raw materials. Au/Cui.94S/ZnS ternary nanocomposites were prepared by loading Au nanoparticles. (XRD), transmission electron microscope (TEM),) was used for X-ray diffraction. The products were characterized by UV-Vis spectrophotometer (UV-Vis), and the photocatalytic degradation of dye RhB by Au/Cui.94S/ZnS nanocomposites was investigated. The results showed that Au/Cui.94S/ZnS nanocomposites had excellent photocatalytic degradation and the photocatalytic mechanism of Au/Cu1.94S/ZnS nanocomposites was also discussed. Synthesis and photocatalytic Properties of Ag2S/ZnS Nanocomposites; using oleamine, n-dodecanediol, oleic acid mixture as solvent, silver diethyldithiocarbamate (S2CNEt2) and zinc diethyldithiocarbamate (S2CNEt2) _ 2 as reactants, and silver diethyldithiocarbamate (S2CNEt2) and zinc diethyldithiocarbamate (S2CNEt2) _ 2 as reactants. The nanocomposites of Ag2S/ZnS were synthesized by thermal decomposition. The products were characterized by (xRD), transmission electron microscope (xRD), (TEM), UV-Vis spectrophotometer (UV-Vis) and so on. During the experiment, we found that the solvent has an important effect on the morphology of the product. In addition, we have also studied the photocatalytic degradation of Rhodamine B solution by Ag2S/ZnS nanocomposites under visible light. The results show that our nanocomposites have good catalytic activity. The photocatalytic mechanism of Ag2S/ZnS nanocomposites was also discussed.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1;TB33

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