树枝状疏水缔合聚合物的吸附行为

ADSORPTION BEHAVIORS OF DENDRITIC HYDROPHOBICALLY ASSOCIATING POLYMERS

以部分水解聚丙烯酰胺(HPAM)为对比,研究了溶液浓度、接触时间、石英砂颗粒粒径对树枝状聚合物DHAP溶液吸附量的影响。结果表明:HPAM符合Langmuir等温线吸附和准二级吸附动力学,在石英砂表面进行化学吸附,具有稳定的单分子层吸附特征,单位面积的平衡吸附量为1.17~1.62μg/cm^(2);树枝状聚合物DHAP符合Langmuir等温线吸附、准二级吸附动力学和Elovich模型,在石英砂上的单位面积吸附量为6.44~8.45μg/cm^(2)。树枝状聚合物DHAP的吸附机理包括以氢键、静电作用等在石英砂表面所产生的一级化学吸附、分子间缔合作用影响下的二级缠绕、树枝状结构的空间展布扩宽吸附层厚度。

Compared with hydrolyzed polyacrylamide(HPAM),the effects of solution concentration,contact time and quartz sand particle size on the adsorption capacity of the dendrimer DHAP solutions were studied.The results showed that the adsorption kinetics of HPAM conformed to Langmuir isotherm and pseudo second order adsorption kinetics.The equilibrium adsorption capacity per unit area is 1.171.62μg/cm^(2).However,the dendritic polymer DHAP conforms to Langmuir isotherm adsorption characteristics,quasi second order kinetics and elovich model.The adsorption capacity per unit area of DHAP on quartz sand rangesfrom 6.44 to 8.45μg/cm^(2).The result indicates that the adsorption mechanism of dendritic polymer DHAP is composed of the first-order chemical adsorption produced by hydrogen bond and electrostatic interaction on the surface of quartz sand and the second-order winding under the influence of intermolecular association.The spatial distribution of branched structure widens the thickness of adsorption layer.