Citation: ZHENG Hua-Rong, WANG Xiao-Wei, LIN Xia-Hui, GENG Qiang, CHEN Xun, DAI Wen-Xin, WANG Xu-Xu. Promoted Effect of Polyethylene Glycol on the Photo-Induced Hydrophilicity of TiO₂ Films[J]. Acta Physico-Chimica Sinica, ;2012, 28(07): 1764-1770. doi: 10.3866/PKU.WHXB201205112 shu

Promoted Effect of Polyethylene Glycol on the Photo-Induced Hydrophilicity of TiO₂ Films

1.
Fujian Provincial Key Laboratory of Photocatalysis——State Key Laboratory Breeding Base, Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002, P. R. China

Received Date: 21 March 2012
Available Online: 11 May 2012
Fund Project: 国家自然科学基金(21073037) (21073037)国家重点基础研究发展规划项目(973) (2010CB234604)资助 (973) (2010CB234604)

To investigate the photo-induced hydrophilicity of TiO₂ films and its durability, a series of TiO₂ films containing polyethylene glycol (PEG) 2000 with different contents are prepared. The photo-induced hydrophilicity of the films is investigated by recording the water-droplet contact angle on the films? surface under UV irradiation, and the hydrophilicity durability is monitored under dark storage conditions. The photo-induced hydrophilicity of TiO₂ films and its hydrophilicity durability are enhanced by introducing 2.0% (w) of PEG into the TiO₂ sol. From Fourier transform infrared (FTIR) spectra and ultraviolet-visible diffuse reflection spectra (UV-Vis DRS), we infer that PEG acts as an electron donor to scavenge the photogenerated holes in TiO₂ and promotes the formation of Ti³⁺ sites, which are induced by the Ti⁴⁺ sites accepting the photo-generated electrons of TiO₂. This promotes the formation of hydrophilic sites (the surface hydroxyl species). Compared with the pure TiO₂ film, the Ti³⁺ sites in the TiO₂/PEG films are more stable, which prolongs the hydrophilicity of TiO₂ films under dark conditions. This study is significant for the application of TiO₂ as a self-cleaning material, and is also a facile approach to investigate the transient behaviors of TiO₂ under UV irradiation.
- Photo-induced hydrophilicity,
- Durability of hydrophilicity,
- Hole scavenger,
- TiO₂ film,
- Ti³⁺ species,
- Polyethylene glycol
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沈阳化工大学材料科学与工程学院沈阳 110142

Promoted Effect of Polyethylene Glycol on the Photo-Induced Hydrophilicity of TiO2 Films

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通讯作者: 陈斌, bchen63@163.com

Promoted Effect of Polyethylene Glycol on the Photo-Induced Hydrophilicity of TiO₂ Films