An investigation of the performance of catalytic aerogel filters
An investigation of the performance of catalytic aerogel filters
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DOI：
10.1016/j.apcatb.2008.08.019
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发表时间：
2009-02-23
影响因子：
22.1
通讯作者：
Yu, Samuel C. T.
中科院分区：
文献类型：
--
作者：
Cao, Shengli;Yeung, King Lun;Yu, Samuel C. T.
本发明涉及高钛含量的透气、光活性和无裂纹的二氧化钛-二氧化硅气凝胶（即，最高Ti/Si = 1）通过两步酸碱催化方法制备，包括硅醇盐的酸催化预水解，然后与螯合的二氧化钛前体的碱催化水解/缩合反应。所制备的TiO 2-SiO2气凝胶具有良好的机械强度（>30 kN m（-2））、大的比表面积（>550 m（2）/g）、介孔结构（8-11 nm）和良好的气体渗透性。多孔气凝胶捕获和过滤空气中的颗粒物，二氧化钛-二氧化硅气凝胶对气溶胶（65%）和生物气溶胶（94%）的过滤性能良好。与商用Degussa P25 TiO 2相比，气凝胶中结晶的光活性纳米TiO 2显示出较高的三氯乙烯UVA光氧化反应速率。二氧化钛-二氧化硅气凝胶在UVA下对枯草芽孢杆菌细胞的杀菌活性也好六个数量级。(C)2008 Elsevier B. V.保留所有权利。
Gas permeable, photoactive and crack-free titania-silica aerogels of high titanium content (i.e., up to Ti/Si = 1) were prepared by two-steps acid-base catalyzed method involving an acid-catalyzed prehydrolysis of silicon alkoxide followed by a base-catalyzed hydrolysis/condensation reactions with a chelated titania precursor. The prepared titania-silica aerogels displayed good mechanical strength (>30 kN m(-2)), large surface area (>550 m(2)/g), mesoporous structure (8-11 nm) and good gas permeation. The porous aerogels trap and filter airborne particulates and the titania-silica aerogel have a fair performance for aerosol (65%) and bioaerosol (94%) filtrations. The photoactive anatase nano-TiO2 crystallized within the aerogel displays an order of magnitude higher reaction rate for UVA photooxidation of trichloroethylene compared to commercial Degussa P25 TiO2. The bactericidal activity of the titania-silica aerogel for Bacillus subtilis cells under UVA was also six orders of magnitude better. (C) 2008 Elsevier B.V. All rights reserved.