苯酚分子印迹聚合物对苯酚的吸附研究

以苯酚为模板分子,二甲基丙烯酸乙二醇酯为交联剂,偶氮二异丁腈为引发剂,通过悬浮聚合法合成了苯酚印迹聚合物。考察了包含酸性、中性、碱性的3种功能单体对聚合物性能的影响,研究了印迹聚合物吸附去除苯酚的工艺条件以及吸附等温线、动力学。结果表明,以4-乙烯基吡啶为功能单体合成的印迹聚合物对苯酚具有更高的吸附量。最佳的吸附工艺条件为:温度为25℃,溶液pH值为8.0,苯酚底液质量浓度为30 mg/L,聚合物投加量为2 g/L。此外,聚合物对苯酚的等温吸附过程服从Langmuir模型,饱和吸附量为10.493 mg/g;吸附动力学过程服从准二级动力学方程,吸附速率常数为0.002 5 g/(mg·min)。

Adsorption of Phenol from Aqueous Solution by Phenol Molecular Imprinting Polymer

A novel phenol imprinted polymer was synthesized by suspension polymerization with phenol as a template, ethylene glycol dimethacrylate as a crosslinking agent, azodiisobutyronitrile as an initiator. Three functional monomers, including acidic, neutral and basic agents, were investigated in the synthesis of phenol imprinted polymer. The adsorption process conditions, adsorption isotherm and adsorption kinetics of phenol by phenol imprinted polymer was investigated. Result showed that, the optimizing conditions for phenol removal was temperature 25 ℃, solition pH 8.0,concentration of phenol 30 mg/L and adsorbent dosage 2.0 g/L,respectively. Moreover, the adsorption isothermal process obeyed the Langmuir model, and the maximum adsorption capacity was 10.493 mg/g. The adsorption behavior could be well described with pseudo-second-order kinetic equation, with a adsorption rate constant 0.002 5 g/(mg·min).