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摘要：
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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10～30 nm的不规则形状纳米粉体以及颗粒长1～2 μm、宽200～300 nm的蠕虫状亚微米粉体和颗粒直径50～200 nm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2 h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。
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Three powders with various morphologies, i.e., irregular nano-powder with the grain size of 10?30 nm, spherical submicron-powder with the grain size of 50?200 nm and worm-like submicron-powder with 1?2 μm 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 microscopy and diffuse reflectance absorption spectroscopy, respectively. The results indicate that the prepared CuAl2O4 powders possess 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.how to catch a cheater link go |
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基金项目：
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辽宁省自然科学基金项目(20092143)资助。
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作者简介：
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参考文献：
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