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光腐蚀是困扰Ⅱ-Ⅵ半导体应用在光催化领域的一大难题。本论文以光催化降解亚甲基蓝为探针反应,研究了ZnS/碳纳米管复合物以及ZnS纳米晶体光催化过程中的光腐蚀机理。研究结果表明碳纳米管虽然不能避免ZnS的光腐蚀,但在每个循环实验中都可以提高ZnS的光催化效率。ZnS纳米晶体在光腐蚀过程中逐渐变小且相互融并,颗粒之间的界限逐渐模糊,并产生一些空腔结构。ZnS纳米晶体质量的损失与光腐蚀时间呈准线性关系,与所用的有机污染物亚甲基蓝的浓度没有关系。在本系统的富OH-体系中,光腐蚀的最终产物主要是ZnSO4。
Photo-etching is a major problem that plagued the application of II-VI semiconductors in the field of photocatalysis. In this thesis, the photocatalytic degradation of methylene blue was used as a probe reaction to study the photo-corrosion mechanism of ZnS / CNTs composite and ZnS nanocrystal during photocatalysis. The results show that although the carbon nanotubes can not avoid the light corrosion of ZnS, the photocatalytic efficiency of ZnS can be improved in every cycle experiment. ZnS nanocrystals gradually become smaller and merge into each other in the process of photoetching, and the boundary between the particles gradually becomes blurred and some cavity structures are formed. The loss of mass of ZnS nanocrystals is in a quasi-linear relationship with the photo-etching time, and has no relation with the concentration of methylene blue used in the organic pollutants. OH-system in the system, the final product of light corrosion is mainly ZnSO4.