In this paper, using methyltriethoxysilane (MTES) and tetraethoxysilane (TEOS) as co-precursor, dual-mesoporous silica aerogel was rapidly prepared within 20 h by ambient pressure drying. The dual-mesoporous structure can be obtained just by control the amount of TEOS. The skeleton structure of the dual-mesoporous aerogel is composed of small mesopores (3-6 nm) and large mesopores (17-30 nm). Moreover, the thermal conductivity (as low as 0.0223 W/(mK)) of the dual-mesoporous aerogel is much lower than most of MTES-based aerogels. More importantly, the obtained dual-mesoporous aerogel can separate oil from surfactant-stabilized oil-in-water emulsion, the separation efficiency as high as 97.6%. In addition, the aerogel exhibits superhydrophobic with a contact angle of 157.4°, thermally stable reaching up to 489.5°C and outstanding sorption capacity reaching up to 8.4-17.1 g/g. The dual-mesoporous silica aerogel have potential application in thermal insulating and organic pollutants sorption.

本文以甲基三乙氧基硅烷（MTES）和四乙氧基硅烷（TEOS）为共前体，通过常压干燥在20 h内快速制备了双介孔二氧化硅气凝胶。仅通过控制TEOS的量即可获得双中孔结构。双中孔气凝胶的骨架结构由小中孔（3-6 nm）和大中孔（17-30 nm）组成。而且，双中孔气凝胶的热导率（低至0.0223 W /（mK））远低于大多数基于MTES的气凝胶。更重要的是，所获得的双介孔气凝胶可以从表面活性剂稳定的水包油型乳液中分离出油，分离效率高达97.6％。此外，气凝胶具有超疏水性，接触角为157.4°，热稳定，可达489。5°C时出色的吸附能力达到8.4-17.1 g / g。双介孔二氧化硅气凝胶在隔热和有机污染物吸附方面具有潜在的应用。