有机/无机复合自修复水凝胶的制备及对Cu^(2+)吸附性能研究

Preparation and study of adsorbing copper ions of organic/inorganic composite self-healing hydrogel

以纳米粘土为交联剂制备了具有自修复性能的聚丙烯酰胺/海藻酸钠/粘土(PAM/SA/Clay)复合水凝胶。探讨了单体与粘土配比、单体与海藻酸钠配比等参数对水凝胶成胶性能的影响。重点对该复合水凝胶的自修复机理、自修复性能及对重金属(Cu^(2+))吸附性能进行评价。结果表明,该复合水凝胶中粘土与单体配比在1∶1时有良好的成胶性能;水凝胶的溶胀性能随粘土含量的增加而下降,最大溶胀率为20.3622g·g^(-1);随着海藻酸钠含量的升高,凝胶的重金属吸附性能提高,单体、粘土及海藻酸钠用量比为1∶1∶0.2时,24h吸附量最大为1.4300×10^(-5)mol·g^(-1);合成的水凝胶在室温下无需任何外加条件,24h即可实现损伤断面的良好的修复。

A new kind of composite hydrogel based on sodium alginate （SA） and poly （acrylamide） （PAM） cross-linked by inorganic clay （LXG） was prepared. The effect of the ratio of monomer, clay and sodium alginate on the performance of hydrogels was investigated. Self-healing mechanism and the performance of adsorbing heavy metal ions （Cu^2＋） of the composite hydrogel were evaluated. Experimental results indicated that when the ratio of monomer/clay was about 1：1, the hydrogel had excellent gelling performance. The swelling ratio decreased with increasing clay contents. The maximum swelling ratio was 20.3622g·g^-1. The performance of adsorbing heavy metal ions increased with increasing sodium alginate contents. The maximum absorbance was 1.430010-5mol· g^-1 when the ratio of Monomer/Clay/Alginate was 1：1：0.2 in the experiment. The composite hydrogel had excellent self-healing performance. The hydrogels could autonomically be healed at room temperature within 24h without any additional conditions.