Control of the photocatalytic activity of TiO₂ nanoparticles by silica coating with polydiethoxysiloxane

详细信息	查看全文 | 推荐本文 |

• 作者：Iqbal Ahmed Siddiquey ; Takeshi Furusawa ; Masahide Sato ; Kozue Honda ; Noboru Suzuki
• 关键词：TiO₂ ; Photocatalytic activity ; Silica coating ; Microwave irradiation ; Polydiethoxysiloxane ; UV shielding
• 刊名：Dyes and Pigments
• 出版年：2008
• 期刊代码：31_01437208
• 类别：ms
• 出版时间：2008
• 卷：76
• 期：3
• 页码：754-759
• 文件大小：1429 K

摘要

A novel, simple and fast coating method that is based on microwave (MW) irradiation and which uses polydiethoxysiloxane (PDES) has been developed for TiO₂ nanoparticles with the aim of reducing their photocatalytic activity. At the same time, silica coating was also carried out using a conventional solution method and the results of both methods were compared. The silica coated TiO₂ nanoparticles were characterized by X-ray photoelectron spectroscopy (XPS), zeta-potential analysis, Fourier transform infrared spectroscopy (FT-IR) and high-resolution transmission electron microscopy (HR-TEM). For both coating methods, the extent of silica coating was found to depend upon the PDES loading; Si content increased with increasing concentration of PDES. Silica coating effectively reduced the photocatalytic activity of the TiO₂ particles as evidenced by the color change of a mixture of non-coated and silica coated particles with 1,3-butanediol under UV radiation. The silica coated TiO₂ nanoparticles obtained using the MW irradiation method showed higher inhibition of photocatalytic activity and superior UV-shielding characteristics than particles coated using the conventional solution method.