Self-cleaning and depollution of fiber reinforced cement materials modified by neutral TiO₂/SiO₂ hydrosol photoactive coatings

详细信息    查看全文

• 作者：Jian Wang^a ; ^b ; ChunHua Lu^a ; ^{chhlu@njut.edu.cn" class="auth_mail} ; JiRu Xiong^b
• 关键词：Photocatalytic ; Self-cleaning ; Glass fiber reinforced cement materials ; TiO2 ; SiO2 ; Hydrosol
• 刊名：Applied Surface Science
• 出版年：15 April, 2014
• 年：2014
• 卷：298
• 期：Complete
• 页码：19-25
• 全文大小：1830 K

文摘

Environmental pollution has an evidently adverse impact on the buildings that are constructed by the glass fiber reinforced cement (GRC) materials. In the present work, the stable, neutral TiO₂/SiO₂ hydrosols were prepared by using the Ti(SO₄)₂ as titanium source, HNO₃ as peptizing agent, and SiO₂ as stabilizer through a simple and low cost process. The morphologies and structures of TiO₂/SiO₂ hydrosol were further characterized by the TEM, SEM, XRD, and FTIR measurement. In the synthetic hydrosol, lots of nanoparticles with the diameters in the range of 10-20 nm can be observed. TiOSi band were formed, as observed from the FTIR spectrum. The Na₂O路SiO₂ was detected from the SEM. After drying the TiO₂/SiO₂ hydrosol, the XRD shown that the TiO₂ has an anatase structure and the SiO₂ is amorphous. The TiO₂/SiO₂ hydrosol can be compactly coated on the GRC surface due to the existence of Na₂O路SiO₂ binder and exhibited high photocatalytic activity and stability in the degradation of Rhodamine B.