以粉煤灰为原料, 通过与NaOH煅烧、水解合成铝硅酸盐中间体(ASI), 向sol-gel法制备的TiO2溶胶中加入ASI, 经处理得到钛铝硅酸盐复合材料(TiO2/ASI). X射线衍射分析(XRD)和紫外-可见漫反射光谱(DRS)研究ASI对sol-gel方法制备TiO2纳米晶形成过程和相转变的影响. 研究结果表明: 铝硅酸盐中间体不但能抑制TiO2纳米粒子的团聚, 而且能够有效地抑制TiO2由锐钛矿型向金红石型的相转变, 由此所制备TiO2与ASI的钛铝硅酸盐复合材料(TiO2/ASI)对溶液中亚甲基蓝的吸附性能高于单一的TiO2或铝硅酸盐中间体.
By heating coal fly ash with hydroxide sodium solution, then hydrolysis, the aluminosilicate intermediate (ASI) was prepared. Through the addition of ASI into the titanium
sol obtained by using the sol-gel method, titanium-aluminosilicate (TiO2/ASI) composites were prepared, and then heat-treated
at different temperatures. The formation process and phase transition of TiO2 nanocrystalline in the TiO2/ASI composites were characterized
by X-ray diffraction and UV-Vis diffuse reflectance spectra. The results indicate that the agglomeration of TiO2 nanoparticles and their phase
transition from anatase to rutile can be inhibited efficiently. The adsorption activity of methylene blue of the synthesized TiO2/ASI
composites is higher than that of only aluminosilicate intermediate or TiO2 particles.
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