中文摘要：

以TiOSO4·2H2O为TiO2的前驱体、蒙脱石为基体，采用水解-插层复合法，在不同热处理温度下制备了系列TiO2／蒙脱石纳米复合样品。采用XRD研究了样品中TiO2物相和晶粒大小等属性的变化，研究了样品对亚甲基蓝溶液的吸附脱色性和光催化脱色性。结果表明，热处理温度对TiO2／蒙脱石中TiO2物相与相对含量、晶粒大小和光催化脱色性等有很大影响。经700℃热处理的TiO2／蒙脱石复合样品锐钛矿晶粒仅为13．7nm，光催化脱色率高达42．7％，总脱色率达79．8％；经1100℃热处理后，锐钛矿相对含量高达55．7％，锐钛矿晶粒为55．8nm，光催化脱色率仍为32．5％，总脱色率高达46．6％；TiO2／蒙脱石复合样品中的TiO2与纯纳米TiO2样品相比，具有更高的锐钛矿相向金红石相转变的温度、更小的TiO2晶粒尺寸、更强的光催化脱色性。蒙脱石结构层对TiO2的相转变和晶粒长大具有明显的阻滞作用。

英文摘要：

The TiO2/montmorillonite nano-composites were prepared by hydrolysation-intercalation method using TiOSO4·2H20 as a precursor of TiO2 and montmorillonite as substrate. The TiO2/montmorillonite samples calcinated at the different temperatures were characterized by X-ray diffraction method, and the phase transition and the grain sizes of TiO2 in the TiO2/montmorillonite samples were studied. The adsorption and photocatalytic decoloration properties of the samples for Methylene Blue in solution were discussed. The results showed that the heating temperatures have a significant influence on the TiO2 phase transition, the relative contents and the grain sizes of anatase and rutile, and the photocatalytic decoloration properties of the TiO2/montmorillonite composite samples. For TiO2/montmorillonite composite sample calcinated at 700 ℃, the crystal size of anatase is only 13.7 nm, meanwhile the photocatalytic decoloration rate and the total decolorization ratio were up to 42. 7% and 79. 8%respectively. After calcined at 1100 ℃, the relative content of anatase in TiO2/montmorillonite composite sample reaches 55.7%, its grain size is 55.8 nm, and the photocatalytic decoloration rate and the total decolorization ratio are still 32.5% and 46.6%. Compared with pure TiO2 nano-particle sample, TiO2 in TiO2/montmorillonite composite samples have a higher phase transition temperatures from anatase phase to rutile phase, smaller grain sizes, and stronger photocatalytic decoloration properties. Montmorillonite structure layer has a significant blocking effect on the phase transformation and the grain growth of TiO2 in TiOJmontmorillonite composite.