College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China.
College of Medicine, Hunan Normal University, Changsha, Hunan 410081, China.
J Colloid Interface Sci. 2015 Aug 1;451:1-6. doi: 10.1016/j.jcis.2015.03.034. Epub 2015 Apr 3.
A novel polar modified post-cross-linked resin PDMPA was synthesized, characterized and evaluated for adsorption of salicylic acid from aqueous solution. PDMPA was prepared by a suspension polymerization of methyl acrylate (MA) and divinylbenzene (DVB), a Friedel-Crafts reaction and an amination reaction. After characterization of the chemical and pore structure of PDMPA, the adsorption behaviors of salicylic acid on PDMPA were determined in comparison with the precursor resins. The equilibrium adsorption capacity of salicylic acid on PDMPA was much larger than the precursor resins and the equilibrium data were correlated by both of the Langmuir and Freundlich models. The pseudo-second-order rate equation fitted the kinetic data better than the pseudo-first-order rate equation, and the micropore diffusion model could characterize the kinetic data very well. The dynamic experimental results showed that the breakthrough point and saturated point of salicylic acid on PDMPA were 40.3 and 92.4BV (1BV=10mL) at a feed concentration of 995.8mg/L and a flow rate of 1.4mL/min, and the resin column could be regenerated by 16.0BV of a mixture desorption solvent containing 0.01mol/L of NaOH (w/v) and 50% of ethanol (v/v).
一种新型的极性修饰后交联树脂 PDMPA 被合成、表征，并用于从水溶液中吸附水杨酸。PDMPA 是通过甲基丙烯酸甲酯（MA）和二乙烯基苯（DVB）的悬浮聚合、傅克反应和胺化反应制备的。在对 PDMPA 的化学和孔结构进行表征后，与前体树脂相比，确定了水杨酸在 PDMPA 上的吸附行为。水杨酸在 PDMPA 上的平衡吸附容量远大于前体树脂，并且平衡数据通过 Langmuir 和 Freundlich 模型进行了关联。准二级速率方程比准一级速率方程更能拟合动力学数据，微孔扩散模型可以很好地描述动力学数据。动态实验结果表明，在进料浓度为 995.8mg/L、流速为 1.4mL/min 的条件下，PDMPA 上水杨酸的穿透点和饱和点分别为 40.3 和 92.4BV（1BV=10mL），树脂柱可以用 16.0BV 的混合解吸溶剂（0.01mol/L 的 NaOH（w/v）和 50%乙醇（v/v））再生。
