Huang Jianhan, Yan Cheng, Huang Kelong
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People's Republic of China.
J Colloid Interface Sci. 2009 Apr 1;332(1):60-4. doi: 10.1016/j.jcis.2008.12.039. Epub 2008 Dec 24.
Chloromethylated styrene-divinylbenzene copolymers were post-crosslinked through Fredel-Crafts alkylation reaction and a water-compatible hypercrosslinked resin HJ-1 was developed successfully. It can be wetted directly by water and can be used without any wetting process. It was applied to remove p-nitrophenol in aqueous solution in comparison with the commercial Amberlite XAD-4 resin. Their adsorption behaviors for p-nitrophenol were conducted and it was found the adsorption dynamics obeyed the pseudo-second-order rate equation and the intra-particle diffusion was the rate-limiting step. The adsorption isotherms can be correlated to Freundlich isotherm and the adsorption capacity onto HJ-1 resin was much larger than XAD-4. The maximum adsorption capacity of p-nitrophenol for HJ-1 resin was measured to be 179.4 mg/g with the equilibrium concentration at 178.9 mg/l and the maximum removal percentage was predicted to be 98.3%. The adsorption thermodynamic parameters were calculated and the adsorption was mainly driven by enthalpy change. The micropore structure, the size matching between the pore diameter of HJ-1 resin and the molecular size of p-nitrophenol, and polarity matching between the formaldehyde carbonyl groups of HJ-1 resin and p-nitrophenol bring the larger adsorption capacity and higher adsorption affinity.
通过傅克烷基化反应对氯甲基化苯乙烯 - 二乙烯基苯共聚物进行后交联，成功开发出一种与水相容的超交联树脂HJ - 1。它可直接被水润湿，无需任何润湿处理即可使用。与市售的Amberlite XAD - 4树脂相比，将其应用于去除水溶液中的对硝基苯酚。研究了它们对对硝基苯酚的吸附行为，发现吸附动力学符合准二级速率方程，颗粒内扩散是限速步骤。吸附等温线可以与弗伦德里希等温线相关联，HJ - 1树脂的吸附容量远大于XAD - 4。测得HJ - 1树脂对对硝基苯酚的最大吸附容量为179.4 mg/g，平衡浓度为178.9 mg/l，预计最大去除率为98.3%。计算了吸附热力学参数，吸附主要由焓变驱动。HJ - 1树脂的微孔结构、孔径与对硝基苯酚分子大小的尺寸匹配以及HJ - 1树脂甲醛羰基与对硝基苯酚之间的极性匹配带来了更大的吸附容量和更高的吸附亲和力。
