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首页> 外文期刊>RSC Advances >Superhydrophobic silica aerogels reinforced with polyacrylonitrile fibers for adsorbing oil from water and oil mixtures
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Superhydrophobic silica aerogels reinforced with polyacrylonitrile fibers for adsorbing oil from water and oil mixtures

机译：聚丙烯腈纤维增强的超疏水二氧化硅气凝胶，可从水和油混合物中吸附油

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Silica aerogels are unique solids with extremely high porosity, transparency and low density. They make excellent adsorbing materials due to their high surface area and three-dimensional reticular structures. However, their fine structures and hydrophilic surfaces make them fragile and impractical for adsorbing oil from water and oil mixtures. To improve their mechanical properties, we incorporate small amounts of polyacrylonitrile fiber into the aerogels, prepared at relatively mild temperatures. Electron microscopy images and pore size distributions of the modified aerogels show that the silica aerogel had a co-continuous porous structure. The aerogels were modified to be superhydrophobic, and the surface hydroxyl or alkoxy groups were converted to stable –CH3 groups with a contact angle as high as 169°. The oil adsorption capacity of the silica aerogels was calculated as 9.56 g/g. The sorption and desorption process could be repeated at least 100 times, indicating that silica aerogels are promising oil-absorbing materials.
机译：二氧化硅气凝胶是独特的固体，具有极高的孔隙率，透明度和低密度。它们具有高的表面积和三维网状结构，因此成为极好的吸附材料。但是，它们的精细结构和亲水性表面使它们易碎且不实用，无法从水和油混合物中吸附油。为了提高它们的机械性能，我们将少量的聚丙烯腈纤维掺入气凝胶中，并在相对温和的温度下制备。改性气凝胶的电子显微镜图像和孔径分布表明，二氧化硅气凝胶具有共连续的多孔结构。将气凝胶改性为超疏水性，并将表面羟基或烷氧基转化为稳定的–CH 3 基团，接触角高达169°。二氧化硅气凝胶的吸油量经计算为9.56g / g。吸附和解吸过程可以重复至少100次，这表明二氧​​化硅气凝胶是很有前途的吸油材料。

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