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本文采用溶胶 凝胶法制备了粒径为 1 0 2 0nm左右的二氧化钛纳米微粒。用XRD研究了二氧化钛溶胶的热处理过程。研究表明温度在 4 73K 673K左右TiO2 微粒呈不规整锐钛矿结构 ,粒径约为 1 0 2 0nm。在873K左右TiO2 微粒出现锐钛矿与金红石型混晶结构。且随温度的升高 ,微粒出现团聚并使粒径增大。用UV vis分光光度计研究了二氧化钛纳米微粒的光吸收特性与光催化活性。结果表明 :二氧化钛纳米微粒的光吸收特性和光催化活性与胶粒制备条件、热处理温度密切相关。所制备的纳米微粒在紫外光区有较宽的光响应范围。不规整锐钛矿型二氧化钛纳米微粒对苯酚的光催化活性高于商品锐钛矿型TiO2 及混晶结构的TiO2 。
In this paper, titanium dioxide nanoparticles with a particle size of about 102 nm were prepared by sol-gel method. The heat treatment of titania sol was studied by XRD. The results show that the temperature at 4 73K 673K TiO2 particles were irregular anatase structure, a particle size of about 1020nm. At about 873K TiO2 particles appear anatase and rutile mixed crystal structure. And with the increase of temperature, the particles appear agglomeration and the particle size increases. The UV absorption spectrophotometer was used to study the light absorption and photocatalytic activity of titanium dioxide nanoparticles. The results show that the light absorption properties and photocatalytic activity of TiO2 nanoparticles are closely related to the preparation conditions and heat treatment temperature. The prepared nanoparticles have a wide range of photoresponse in the ultraviolet region. The photocatalytic activity of irregular anatase titanium dioxide nanoparticles on phenol was higher than that of commercial anatase TiO2 and mixed crystal TiO2.