Citation: GUO Xing-Zhong, SHAN Jia-Qi, DING Li, YU Huan, ZHANG Xiao-Qi, YANG Hui. Preparation and Characterization of Hierarchically Porous Silica Monoliths[J]. Chinese Journal of Inorganic Chemistry, ;2015, (4): 635-640. doi: 10.11862/CJIC.2015.118 shu

Preparation and Characterization of Hierarchically Porous Silica Monoliths

1.
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received Date: 7 October 2014
Available Online: 19 January 2015
Fund Project: 国家自然科学基金(No.51372225) (No.51372225)浙江省自然基金(No.LY13B010001)资助项目。 (No.LY13B010001)

Hierarchically porous SiO₂ monoliths were prepared via sol-gel process accompanied by phase separation with tetramethoxysilane (TMOS) as precursor, poly (ethylene oxide) (PEO) as phase separation inducer, propylene oxide(PO) as gelation agent, 0.01 mol·L^-1 hydrochloric acid as catalyst, and twelve sodium dodecyl sulfate(SDS) as mesopore forming agent. The resultant monoliths were characterized by differential thermal analysis (DTA), thermogravimetry (TG), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption/desorption analysis, and the effects of SDS on the macroporous and mesoporous structure of the monoliths were investigated. The results show that the SDS uniformly distributes into the skeletons in the form of micelles, which leads to the formation of mesopores. When SDS is 0.21 g, the optimum hierarchically porous structure is obtained with macropore size of 1~3 μm, mesopore size of 4~5 nm, and BET specific surface area as high as 650 m²·g^-1. After heat treatment at 800℃, macroporous structure and mesopores on the skeleton basically remain, and the BET specific surface area still maintains at 421 m²·g^-1, which indicates good thermal stability.
- sol-gel;phase separation;silica;porous monolith;pore forming agent
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沈阳化工大学材料科学与工程学院沈阳 110142