鼠李糖脂碳吸附剂的制备及其吸附性能的研究

Preparation and Adsorption Properties of Rhamnolipid Adsorbent

以蔗糖和硅酸钠分别作为碳、硅凝胶的前驱体,经溶胶-凝胶反应形成硅凝胶和蔗糖聚合物的混合网络结构,高温炭化后将二氧化硅刻蚀去除,制备了一种以中孔径为主的多孔碳材料,其孔径可以通过反应条件的改变控制在8～25nm范围内,经过扫描电子显微镜的观察以及低温氮气吸附等温线分析发现,在蔗糖/硅摩尔比为0．33、溶胶pH值为3、凝胶温度为80℃、炭化温度为850℃时,所制得的中孔碳BET表面积为597．63 m^2/g、孔容及中孔率好,对鼠李糖脂有良好的吸附性．

We used sucrose as carbon precursor and sodium silicate as silica precursor, and then generated a silica gel network and sucrose copolymer by the process of heat treatment. After carbonizing and etching the silica template, mesoporous carbons were obtained, whose pore sizes were 8-25nm. The obtained porous carbons were characterized by scanning electron microscope observation and nitrogen adsorption/desorption isotherms, we found that when the sucrose/silica mol ratio was 0.33, pH ratio of the sol solution was 3, gelling tempreture was 80℃ and carbonization temperature was 850℃,the porous carbon prepared had BET surface area of 597.63m^2/g, good pore volume, and mesoporosity, and had fine adsorption properties to rhamnolipid.