以水热法、用钛酸丁酯和二乙醇胺为原料、在160℃保温4小时合成了TiO_2纳米颗粒.在pH值约为2时通过静电吸引把TiO_2涂覆在硅藻土表面形成TiO_2-硅藻土复合材料,并用透射电镜(TEM)、扫描电镜(SEM)、X-射线衍射(XRD)和差热示差扫描量热仪(DSC)研究了其性能.TiO_2是近正方形的、分散良好的锐钛矿晶体,其颗粒大小约为15nm.TiO_2均匀的、牢固的附着在硅藻土的表面上,其TiO_2/硅藻土质量比为1:10.TiO_2-硅藻土复合材料具有良好的光催化性能,在紫外光照射下100g复合材料用3h可使10ml浓度为20mg/L的甲基橙水溶液完全降解.
TiO_2 nanoparticles were hydrothermally synthesized at 160℃ for 4h using tetrabutyl titanate and diethanolamine. TiO_2-diatomite composites were prepared by coating TiO_2 sol on diatomite at pH value of ca. 2. TiO_2 and its composites were investigated by transmission electron microscope(TEM), scanning electron microscope (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC).TiO_2 was anatase-type, near square and dispersive in the size of about 15nm. TiO_2 was mounted uniformly with TiO_2/diatomite mass ratio of 1 : 10 on the diatomite with strong bonds. TiO_2-diatomite composites owned good photocatalytic performance to decolorize methyl orange. 10ml of 20mg/L aqueous methyl orange was decolorized by 100rag TiO_2-diatomite composites in 3h under UV light irradiation.
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