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研究了阴离子交换膜对阴离子型聚丙烯酰胺的吸附规律和影响因素.采用静态吸附的方法,测定了不同温度、不同浓度的阴离子型部分水解聚丙烯酰胺(HPAM)溶液在阴离子交换膜上的吸附量、吸附平衡时间,考察了初始HPAM溶液浓度、pH值以及溶液中其他离子浓度对其在离子交换膜上吸附的影响,目的是阐明阴离子交换膜对HPAM分子的吸附动力学过程、探讨各影响因素对吸附过程的影响.结果表明,阴离子型部分水解聚丙烯酰胺在阴离子交换膜上有明显的吸附作用,但在阳离子交换膜上吸附量几乎为0;阴离子交换膜对聚合物的吸附平衡时间随聚合物溶液初始浓度的增大而延长,且不同浓度、不同温度下的吸附过程动力学特征都能很好地遵循准二级动力学模型;303、308和313 K温度下,阴离子交换膜对聚合物的等温吸附可用Freundlich等温吸附模型很好地拟合,相关系数R2均达到0.99以上,温度越高,吸附量越大;聚合物溶液pH值和离子浓度对吸附效果有显著影响:pH=6时,吸附量达到最大值;吸附量随着离子浓度的增加而增大.
The adsorption laws and influencing factors of anionic polyacrylamide on anion exchange membrane were studied.The adsorption of anionic polyacrylamide (HPAM) solution on anion exchange membrane at different temperatures and different concentrations was measured by static adsorption method Amount and equilibrium time of adsorption, the influence of initial HPAM solution concentration, pH value and other ions concentration in the solution on the adsorption on the ion exchange membrane was investigated. The purpose was to elucidate the adsorption kinetics of the anion exchange membrane on the HPAM molecule, Factors on the adsorption process.The results showed that the anionic partially hydrolyzed polyacrylamide has obvious adsorption on the anion exchange membrane but the adsorption capacity on the cation exchange membrane is almost zero.The adsorption equilibrium time of the anion exchange membrane on the polymer With the increase of the initial concentration of the polymer solution, the dynamic characteristics of the adsorption process can be well followed pseudo-second-order kinetics model at different concentrations and temperatures; at 303,308 and 313 K, the anion exchange membrane The isothermal adsorption of polymers can be well fitted by the Freundlich isotherm model with a correlation coefficient R2 Above 0.99, the higher the temperature, the larger the adsorption capacity. The pH value of the polymer solution and the ion concentration have a significant effect on the adsorption effect: when pH = 6, the adsorption capacity reaches the maximum value; the adsorption capacity increases with the increase of the ion concentration.