疏水型海藻酸钠基气凝胶的制备及性能研究

Preparation and Properties of Hydrophobic Alginate Based Aerogels

天然多糖基气凝胶材料因其优异的性能备受关注。但自身含有羟基、羧基等亲水基团,极大地限制了其在选择性吸油方面的应用。本文以海藻酸钠为原料,经过乙醇处理制备了海藻酸钠基气凝胶。以十八烷基三氯硅烷为疏水改性剂,在溶剂二甲苯中制备了疏水型海藻酸钠基气凝胶。疏水型海藻酸钠基气凝胶的表面粗糙,表面微观结构中出现条纹状区域且出现了Si元素和C=O键,表明改性成功。经过疏水改性后对油类的吸附率得到提升并且更加具有选择性。

Natural polysaccharide-based aerogel materials have attracted much attention due to their excellent properties.However,it contains hydrophilic groups such as hydroxyl groups and carboxyl groups,which greatly limits its application in specific aspects.In this paper,sodium alginate-based aerogels were prepared by sodium alginate as raw material and treated with ethanol.A hydrophobic alginate-based aerogel was prepared in a solvent xylene using octadecyltrichlorosilane as a hydrophobic modifier.The hydrophobic alginate-based aerogel has a rough surface,a striped region appears in the surface microstructure,and Si element and C=O bond appear,indicating that the modification is successful.After hydrophobic modification,the adsorption rate of oils is improved and more selective.