The hierarchical porous structure of substrate enhanced photocatalytic activity of TiO2/cementitious materials
The hierarchical porous structure of substrate enhanced photocatalytic activity of TiO2/cementitious materials
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DOI：
10.1016/j.conbuildmat.2014.04.073
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发表时间：
2014-08-14
影响因子：
7.4
通讯作者：
Hu, Shuguang
中科院分区：
文献类型：
--
作者：
Wang, Fazhou;Yang, Lu;Hu, Shuguang
虽然在空气净化胶凝材料上使用TiO2光催化剂在近几十年得到了迅速发展，但由于胶凝基材的比表面积低、气体扩散和透光性能差，TiO2的光催化效果明显减弱。本文提出了一种新型的分层多孔结构镁胶凝/TiO2光催化剂（FMOC/TiO2），以提高光催化效果和TiO2在胶凝材料中的利用率。结果表明，衬底的分层多孔结构有利于TiO2的分散，提供了更多的活性TiO2位点和更大的催化面积。衬底良好的气体扩散和透光性能提高了TiO2粒子的光催化效果和利用率。测定了气态丙酮在FMOC/T12（空set50 * 3mm）表面的反应速率比MOC/T12（空set50 (*) 3mm）高3.87倍。此外，FMOC/T12（空集50* 3mm）也表现出优异的重复使用性能。(C) 2014 Elsevier Ltd.版权所有。
Although the use of TiO2 photocatalyst on cementitious materials for air purification has been developing rapidly in the last decades, the photocatalytic effect of TiO2 is significantly diminished due to the low specific surface areas, poor gas diffusion and light transmission performance of cementitious substrates. This paper presents a novel hierarchical porous structure magnesium cementitious/TiO2 photocatalyst (FMOC/TiO2) to improve the photocatalytic effect and utilization rate of TiO2 in cementitious materials. The results revealed that the hierarchical porous structure of substrate was beneficial to the dispersion of TiO2, which provided more active TiO2 sites and large catalytic areas. The good gas diffusion and light transmittance performance of substrate improved the photocatalytic effect and utilization rate of TiO2 particles. The reaction rate of gaseous acetone in FMOC/T12 (empty set50 * 3 mm) surface was measured to be about 3.87 times higher than MOC/T12 (empty set50 (*) 3 mm). Additionally, FMOC/T12 (empty set50*3 mm) also exhibited an excellent re-use performance. (C) 2014 Elsevier Ltd. All rights reserved.