【作者】 李海军；

【导师】 张霞；

【作者基本信息】 东北大学 ， 应用化学， 2010， 硕士

【摘要】 纳米TiO2由于粒径小、比表面积大,表面存在大量羟基能够和阳离子键合,对金属离子表现出较强的吸附能力,是一种有着巨大应用前景的吸附材料。但是,直接利用纳米TiO2粉体作为吸附剂,反应后吸附剂难以分离回收,造成二次污染,TiO2微粒的负载化是解决这个问题的一个行之有效的方法。本实验通过溶胶-凝胶法,以玻璃为基底,制备了纳米TiO2薄膜材料。系统研究了溶胶各个组分的配比对最终成膜形貌的影响,确立了最佳成膜条件为：C(钛酸四丁酯)=0.7mol/L、C(水)=2.1mol/L、C(二乙醇胺)=1.4mol/L、聚乙二醇的量为20g/L溶胶。并应用SEM、AFM、XRD、UV-VIS等手段进行了表征。结果表明：TiO2薄膜为白色透明的材料,由20nm以下的锐钛矿TiO2粒子构成,表面均匀分布着直径约0.44μm孔洞,并对350nm以下的紫外光具有良好的吸收效果。研究了在最佳成膜条件下制取的纳米TiO2薄膜材料对水溶液中微量Cu2+的吸附行为。确定最适合吸附条件：pH=7.0,吸附作用时间为120min,饱和吸附量为0.2234mmol/g。该薄膜材料在经历8次复用后依然保持对Cu2+较高的吸附效率。更多还原

【Abstract】 Nano-TiO2particle, with small particle size, surface area and large number of hydroxyl on the surface, which can bond with cations, show a strong adsorption capacity and chemical activity. It is a tremendously promising adsorption material.However, the direct use of nano-TiO2powder as an adsorbent results in problems for separation and recovery after the reaction, and secondary pollution may raise, TiO2particle load is an effective way to solve the problem.In this dissertation, nano-TiO2films were prepared on glass substrate by sol-gel method. The effect of various reactants on film appearance was studied. The optimum preparation conditions of TiO2films were as follows:C(TBOT)=0.7mol/L, C(H2O)=2.1mol/L, C(DEA)=1.4mol/L, the amount of PEG-1000is20g/L. And the films were characterized by SEM, AFM, XRD, and UV-VIS spectra.The results show that the transparent TiO2particles of the film were of anatase phase and about50nm in size. And the films exhibited a strong absorption to the UV-light below350nm.Nano-TiO2films were employed for the adsorption of copper ions from aqueous solution.The most suitable adsorption conditions were pH=7.0, adsorption time120min, adsorption capacity0.2234mmol/g.更多还原