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采用溶胶–凝胶法,并辅以十六烷基三甲基溴化铵(CTAB)表面活性剂,通过调节溶胶体的酸碱度,分别制得了颗粒直径为10~30nm的不规则形状纳米粉体以及颗粒长1~2μm、宽200~300nm的蠕虫状亚微米粉体和颗粒直径50~200nm的球状亚微米粉体。X射线衍射、扫描电子显微镜和漫反射吸收光谱分析表明,制备出的CuAl2O4粉体材料具有尖晶石晶体结构,并在可见区域有良好的光谱响应。在研究微观形貌与可见光催化活性过程中发现,颗粒大小是影响催化效果的主要因素,与微观形貌关系不大。实验条件下,颗粒小、比表面积大的纳米级CuAl2O4粉体具有最佳的可见光催化特性,在可见光辐照下对甲基橙的2h降解脱色率达98%。循环使用5次后仍保持有89%的降解效率,表现出较强的抗吸附毒化能力和抗光腐蚀能力。
The sol-gel method was used together with cetyltrimethylammonium bromide (CTAB) surfactant. The pH of the sol had been adjusted to obtain the irregular-shaped nano-powders with the particle diameter of 10-30 nm As well as worm-shaped submicron powder with a particle length of 1-2 μm and a width of 200-300 nm and spherical submicron powder with a particle diameter of 50-200 nm. X-ray diffraction, scanning electron microscopy and diffuse reflectance absorption spectroscopy showed that the prepared CuAl2O4 powder has a spinel crystal structure with a good spectral response in the visible region. In the study of the microstructure and visible light catalytic activity found that the particle size is the main factor affecting the catalytic effect, and the relationship between the micro-morphology is not. Under the experimental conditions, nano-sized CuAl2O4 powders with small particle size and large specific surface area have the best visible-light catalytic properties. The degradation rate of methyl orange under 98% visible light irradiation for 2h is 98%. Cyclic use after 5 times still maintain a 89% degradation efficiency, showing strong resistance to adsorption poisoning and anti-light corrosion.