College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, PR China.
College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, PR China.
J Hazard Mater. 2017 May 5;329:77-83. doi: 10.1016/j.jhazmat.2017.01.030. Epub 2017 Jan 22.
Two approaches were used to synthesize two resins with different pore structures. In one way, the CHCl groups in macroporous chloromethylated polystyrene resin were transformed to methylene bridges, and achieved a hypercrosslinked resin with plentiful micropores (denoted GQ-06). In the other way, 50% of the CHCl groups in chloromethylated polystyrene resin was used to produce micropores, while the residual 50% of the CHCl groups was reacted with 2-aminopyridine, and prepared another resin with double pore structure of hypercrosslinked resin and macroporous resin (denoted GQ-11). The adsorption of salicylic acid (SA) on GQ-11 was investigated using GQ-06 as the reference adsorbent. The effect of pH on the adsorption of SA on GQ-06 was consistent with the dissociation curve of SA. The maximum adsorption capacity of SA on GQ-11 was observed at the solution pH of 2.64. The greater adsorption rate of SA on GQ-11 than that of GQ-06 was attributed to its double pore structure. The multifunctional adsorption mechanism of anion exchange and hydrophobic interaction resulted in the larger equilibrium capacity of SA on GQ-11 than that of GQ-06. GQ-06 and GQ-11 could be regenerated by absolute alcohol and 80% of alcohol -0.5mol/L of sodium hydroxide aqueous solution, respectively.
采用两种方法合成了两种具有不同孔结构的树脂。一种方法是将大孔氯甲基化聚苯乙烯树脂中的 CHCl 基团转化为亚甲基桥，得到具有丰富微孔的超交联树脂（记为 GQ-06）。另一种方法是将氯甲基化聚苯乙烯树脂中的 50%的 CHCl 基团用于产生微孔，而剩余的 50%的 CHCl 基团与 2-氨基吡啶反应，制备另一种具有超交联树脂和大孔树脂双重孔结构的树脂（记为 GQ-11）。以 GQ-06 为参考吸附剂，研究了水杨酸（SA）在 GQ-11 上的吸附。SA 在 GQ-06 上的吸附受 pH 值的影响与 SA 的离解曲线一致。在溶液 pH 值为 2.64 时，SA 在 GQ-11 上的最大吸附容量。SA 在 GQ-11 上的吸附速率大于 GQ-06 的原因是其具有双重孔结构。阴离子交换和疏水相互作用的多功能吸附机制导致 SA 在 GQ-11 上的平衡容量大于 GQ-06。GQ-06 和 GQ-11 可以分别用无水乙醇和 80%的乙醇-0.5mol/L 的氢氧化钠水溶液再生。
