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Synthesis of TiO2–SiO2 aerogel via ambient pressure drying: effects of sol pre-modification on the microstructure and pore characteristics

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Abstract

TiO2–SiO2 composite aerogels were prepared via ambient pressure drying by sol–gel and surface modification for both the sol and gel samples. The organosilane reagents of decamethyltetrasiloxane (DMTSO)/trimethylchlorosilane (TMCS) and hexamethyldisiloxane (HMDSO)/TMCS were introduced into the TiO2–SiO2 composite sol for pre-modification respectively, and subsequently the TMCS/hexane solution was used for surface modification of the obtained TiO2–SiO2 composite gel. The effects of sol pre-modification on the microstructure and pore characteristics of TiO2–SiO2 composite aerogels were investigated. The results indicate that HMDSO/TMCS coupling reagents is more appropriate for the pre-modification of TiO2–SiO2 composite sol than the DMTSO/TMCS reagents. The best volume ratio of HMDSO/TMCS/composite sol for preparing mesoporous TiO2–SiO2 composite aerogels is in the range of 1:0.33:10–1:1.0:10, with which the specific surface area and pore volume of the obtained TiO2–SiO2 composite aerogels are 492–645 m2/g and 2.63–2.85 m3/g, respectively. The results of adsorption and photocatalytic degradation of rhodamine B show that the as-prepared TiO2–SiO2 composite aerogels have higher adsorption/photocatalysis. Particularly, the as-prepared TiO2–SiO2 composite aerogels with HMDSO/TMCS showed prominent adsorption capability with the adsorption rate attaining to 89.4 % within 60 min.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51278074), the Project of Dalian Science & Technology Foundation (2007J23JH014), and Dalian City Construction Science & Technology Project (20111228).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Dalian Polytechnic University, Dalian, China

    Jing-Xiao Liu, Fei Shi, Lu-Nan Bai, Xiang Feng, Xiao-Ka Wang & Lei Bao

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  1. Jing-Xiao Liu
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  2. Fei Shi
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  3. Lu-Nan Bai
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Correspondence to Fei Shi.

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Liu, JX., Shi, F., Bai, LN. et al. Synthesis of TiO2–SiO2 aerogel via ambient pressure drying: effects of sol pre-modification on the microstructure and pore characteristics. J Sol-Gel Sci Technol 69, 93–101 (2014). https://doi.org/10.1007/s10971-013-3190-7

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  • DOI: https://doi.org/10.1007/s10971-013-3190-7

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