氨基淀粉/凹土/丙烯酸树脂的制备及其吸附性能

Preparation and Adsorption Properties of Amino Starch-graft-attapulgite/Acrylic Acid Composites

以反相悬浮聚合法制备得到氨基淀粉/凹土/丙烯酸树脂,设计正交实验探讨了凹土与丙烯酸投料比,分散剂、交联剂、引发剂含量及油水比对树脂吸附Cu^(2+)性能的影响效果,优化了制备条件,并通过红外、热失重分析、扫描电镜等分析手段对产物结构及形貌进行了表征。对产物和氨基淀粉吸附Cu^(2+)性能的研究表明,该树脂的吸附平衡时间为45min;溶液pH值为4时,吸附效果最佳;树脂对Pb^(2+)、Cd^(2+)、Cu^(2+)、Ni ^(2+)、Zn^(2+)吸附选择性为Cu^(2+)>Pb^(2+)>Cd^(2+)>Ni ^(2+)>Zn^(2+);同等条件下,树脂的吸附性能均优于氨基淀粉的。

The amino starch-graft-attapulgite/acrylic acid composites were synthesized by the inverse suspension poly- merization. Orthogonal tests were applied to discuss the effects of weight ratio of attapulgite to acrylic acid, dispersant, crosslinking agent,initiator agent, and ratio of oil to water on the adsorption towards Cu2＋ , and the preparation conditions were optimized. Moreover,the structure and morphology of the composites were analyzed by FTIR, TGA, and SEM, re- spectively. Adsorption behaviors both of the composite and the amino starch were investigated, whose results show that the adsorption capacity reach an optimum at pH 4,adsorption equilibrium is attained around 45 min. Besides, the order of the adsorption in a mixed solution is Cu2＋〉Pb2＋〉Cd2＋ 〉Ni2＋ 〉Zn2＋. And the adsorption of the composite is better than that of the amino starch under the same conditions.