基于埃洛石的水凝胶的制备及其吸附阳离子染料性能研究

Preparation of Hydrogel Composites Based on Halloysite and Its Adsorption Properties to Cationic Dye

以埃洛石、丙烯酸、丙烯酰胺和聚乙烯醇为原料,合成了半互穿的水凝胶复合材料,并用红外和扫描电镜对产物进行了表征。研究了埃洛石的含量对复合材料吸附亚甲基蓝性能的影响,并用正交实验方法研究了材料的粒径、溶液的pH值和离子强度等因素对吸附亚甲基蓝性能的影响,还分析了吸附过程的热力学和动力学。结果表明,对吸附效果影响大小的顺序为pH值>粒径>离子强度;吸附数值对朗格缪尔吸附等温线拟合得非常好,在20℃时对亚甲基蓝的最大吸附量是1767mg/g。

Hydrogel composite was synthesized with halloysite, acrylic acid, acrylamide and polyvinyl alcohol as the materials, and the composite was characterized by FTIR and SEM. The effect of halloysite content on tile ad sorption properties of the composite to methylene blue was investigated, and the influences of partical sizes, pH values and ionic strengths on the adsorption properties were studied by orthogonal test; furthermore, the thermodynamics and adsorption kinetics were also studied. The results showed that the order of influencing factors on adsorption to methylene blue was pH value〉partical size〉ionic strength; the equilibrium data fitted very well with the Langmuir isotherm, and the maximum adsorption capacity to methylene blue reached 1767mg/g at 20℃.