Department of Chemistry, Gandhigram Rural University, Gandhigram 624 302, Tamil Nadu, India.
Int J Biol Macromol. 2012 Apr 1;50(3):650-7. doi: 10.1016/j.ijbiomac.2012.01.012. Epub 2012 Jan 18.
Silica gel/chitosan composite (SiCS) was prepared via., sol-gel method by mixing silica gel and chitosan and cross-linked with bifunctional cross-linker glutaraldhyde. The SiCS composite was characterized using FT-IR, SEM-EDAX, XRD and BET methods. The sorption of copper and lead ions onto SiCS has been investigated. The SiCS composite was found to have excellent metal sorption capacity than the silica gel (Si) and chitosan (CS). The sorption experiments were carried out in batch mode to optimize various parameters viz., contact time, pH, initial metal ion concentration, co-ions and temperature that influence the sorption. Langmuir, Freundlich and Dubinin-Radushkevich adsorption isotherm models were applied to describe isotherm constants. Equilibrium data agreed well with the Freundlich isotherm model. Thermodynamic studies revealed that the nature of sorption is spontaneous and endothermic. The SiCS removes metals by means of adsorption and complexation. Sorption capacity of SiCS is compared with other sorbents which suggest that this composite was useful for removing copper and lead from aqueous solution.
硅胶/壳聚糖复合材料（SiCS）是通过溶胶-凝胶法混合硅胶和壳聚糖，并与双官能交联剂戊二醛交联制备的。采用 FT-IR、SEM-EDAX、XRD 和 BET 方法对 SiCS 复合材料进行了表征。研究了铜和铅离子在 SiCS 上的吸附。结果表明，SiCS 复合材料的金属吸附容量优于硅胶（Si）和壳聚糖（CS）。吸附实验采用间歇模式进行，以优化各种参数，如接触时间、pH 值、初始金属离子浓度、共存离子和温度，这些参数影响吸附。应用 Langmuir、Freundlich 和 Dubinin-Radushkevich 吸附等温线模型来描述等温线常数。平衡数据与 Freundlich 等温线模型吻合较好。热力学研究表明，吸附的性质是自发和吸热的。SiCS 通过吸附和络合去除金属。SiCS 的吸附容量与其他吸附剂进行了比较，表明该复合材料可用于从水溶液中去除铜和铅。
