Department of Chemistry, Faculty of Science, University of Maragheh, P.O. Box 55181-83111, Maragheh, Iran.
Carbohydr Polym. 2013 Oct 15;98(1):358-65. doi: 10.1016/j.carbpol.2013.05.096. Epub 2013 Jun 18.
CarAlg/MMt nanocomposite hydrogels composed of kappa-carrageenan (Car) and sodium alginate (Alg) biopolymers were synthesized by incorporation of sodium montmorillonite (Na-MMt) nanoclay. Acrylamide (AAm), methylenebisacrylamide (MBA), and ammonium persulfate (APS) were used as monomer, crosslinker, and initiator, respectively. The structure and morphology of nanocomposites were characterized by XRD, SEM, and TEM techniques. The XRD results showed exfoliated MMt nanoclay and exfoliation of MMt was confirmed by TEM graph. The resulting nanocomposites were evaluated to remove cationic crystal violet (CV) dye from water. According to data, the adsorption capacity of nanocomposites was enhanced as the clay content was increased. The experimental data were analyzed according to both Langmuir and Freundlich models and experimental maximum adsorption capacity was obtained 88.8 mg g(-1). By studying the effect of pH on the dye adsorption capacity of nanocomposites, it was revealed that the adsorption capacity of nanocomposites was enhanced at acidic pHs as the Na-MMt nanoclay and kappa-carrageenan components were increased.
由角叉菜胶（Car）和海藻酸钠（Alg）生物聚合物组成的 CarAlg/MMt 纳米复合水凝胶是通过掺入钠蒙脱石（Na-MMt）纳米粘土合成的。丙烯酰胺（AAm）、亚甲基双丙烯酰胺（MBA）和过硫酸铵（APS）分别用作单体、交联剂和引发剂。通过 XRD、SEM 和 TEM 技术对纳米复合材料的结构和形态进行了表征。XRD 结果表明，MMt 纳米粘土被剥离，TEM 图证实了 MMt 的剥离。对所得纳米复合材料进行评估，以从水中去除阳离子结晶紫（CV）染料。根据数据，随着粘土含量的增加，纳米复合材料的吸附能力得到增强。根据朗缪尔和弗伦德利希模型对实验数据进行分析，得到实验最大吸附容量为 88.8 mg g(-1)。通过研究 pH 值对纳米复合材料染料吸附能力的影响，发现随着 Na-MMt 纳米粘土和角叉菜胶成分的增加，纳米复合材料在酸性 pH 值下的吸附能力增强。
