膨润土-聚丙烯酸钠吸附Cu^(2+)动力学特征

Dynamics characteristics of Cu^(2+) adsorption by bentonite-poly acrylic acid sodium

对膨润土-丙烯酸钠聚合机理、聚合产物吸水特征、Cu2+吸附及解吸特征进行了研究,研究结果表明:丙烯酸钠聚合反应主要发生在颗粒间,还有少量丙烯酸钠在蒙脱石层间发生聚合反应;适量膨润土的添加会改善聚合物的吸水性能;较高浓度Cu2+溶液中,膨润土的添加对其吸附性能无显著影响,但会减缓聚合物解吸速度;聚合物吸水过程符合伪一级动力学方程;离子吸附及解吸过程符合伪二级动力学方程.

The mechanism of copolymerization of bentonite-acylic acid sodium and the characteristics of water absorption, Cu2＋ adsorption and desorption were investigated. Acrylic acid mainly reacts around bentonite particles, and still a few of acylic acid reacts in the interlamination of montmorillonite. The addition of bentonite can improve the water-absorption property of the copolymer within a certain addition amount range. In high concentration of Cuz＋ solution, the addition of bentonite produse no significant effect on the Cu2＋ adsorption property of the copolymer, but it will retard the Cuz＋ de- sorption process. The water-absorption process of the copolymer follows pseudo first order kinetics equation, and the ion adsorption and desorption process follows pseudo second order kinetics equation.