聚乙二醇对TiO2-SiO2粒子的生成及光催化性能影响

以TiCl4为原料，采用自组装技术制备TiO2-SiO2复合粒子，加入聚乙二醇2000（PEG 2000），探讨聚乙二醇对TiO2-SiO2粒子生成及光催化降解甲基橙的影响。研究发现：随组装次数的增多，复合粒子表面TiO2 的含量增多；随PEG2000的加入，TiO2颗粒间呈现一定的孔隙，使TiO2层粒子的表面积增加；样品经550 ℃煅烧，得到均为锐钛矿与金红石的混合相，且随着PEG2000含量的增加，锐钛矿的相对含量随之增加；光催化实验表明，PEG2000的掺杂使TiO2-SiO2的光催化性能得以提高。

Effects of PEG2000 Addition on the Formation and Photocatalytic Activity of TiO2-SiO2 Particles

TiO2-coated SiO2 (TiO2-SiO2) particles were prepared by a layer-by-layer assembly technique using TiCl4 as a precursor. Then PEG2000 was added in the particles. Effects of PEG2000 on the formation and photocatalytic activity of TiO2-SiO2 were studied. The results show that the amount of TiO2 on the surface of the particles was increased with more coating layers. With PEG addition to the precursor solution, many fine pores in the particles appeared among the TiO2 particles and the surface area of TiO2-SiO2 was increased. The mixed crystalline phases of anatase and rutile were synthesized by 550 oC calcination, and the relative content of anatase phase increased with increasing of PEG2000 amount. The catalytic activity of PEG2000-added TiO2-SiO2 was higher than that of TiO2-SiO2 without addition.