CuAl_2O_4微观形貌可控制备及其对可见光光催化性能的影响  

Preparation of Controllable Morphology CuAl_2O_4 and Influence on Visible Light Photocatalytic Properties

作　　者：姜妍彦[1] 杜兴科 张纪文[1] 胡志强[1] 刘敬肖[1] 郝洪顺[1] 

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034

出　　处：《硅酸盐学报》2013年第9期1296-1300,共5页Journal of The Chinese Ceramic Society

基　　金：辽宁省自然科学基金项目(20092143)资助

摘　　要：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。Three powders with various morphologies, i.e., irregular nano-powder with the grain size of 10？30 nm, spherical submi-cron-powder with the grain size of 50？200 nm and worm-like submicron-powder with 1？2μm in length and 200-300 nm in width, were prepared by a sol？gel method using cetyltrimethyl ammonium bromide （CTAB） as a surfactant, respectively. The samples were prepared via the adjustment of pH value of sol solution. The samples were characterized by X-ray diffraction, scanning electron mi-croscopy and diffuse reflectance absorption spectroscopy, respectively. The results indicate that the prepared CuAl2O4 powders pos-sess a spinel crystal structure, and have a superior spectral response in the visible region. It is also found that the grain size is a major factor affecting the catalytic effect, while the morphology has little effect. The CuAl2O4 nano-powders with the smaller size and greater specific surface area have the optimum visible light catalytic activities, and the decolorization rate of methyl orange is up to 98%under the visible light irradiation for 2 h. The degradation efficiency can remain to be 89%after 5-times recycling. The CuAl2O4 powders show an intensive resistance to poison adsorption and light corrosion as well.

关 键 词：铝酸铜 微观形貌 可见光催化 降解 表面活性剂 

分 类 号：TQ171.71[化学工程—玻璃工业]