大孔吸附树脂XAD-4对聚乙二醇的吸附性能

Adsorption Property of Macroporous Resin XAD-4 to Polyethylene Glycol

以大孔吸附树脂XAD-4为吸附剂,采用静态平衡吸附法吸附模拟聚乙二醇(PEG)废水,考察了初始pH值、吸附时间、吸附剂投加量和温度等因素对PEG去除效果的影响.结果表明,pH值对吸附过程的影响可忽略不计.当XAD-4树脂投加量为0.3 g/L时,PEG去除率可达89%,平衡吸附量Q_e=59.95 mg/g.PEG在XAD-4树脂表面上均一分布,Langmuir,Dubinin-Radushkevich和Sips模型可较好地模拟其等温吸附过程.不同温度下均为自发的放热吸附过程.动态吸附数据符合拟二级动力学方程.

Macroporous resin XAD-4 was used as adsorbent to remove polyethylene glycol（PEG） from aqueous solution by static adsorption method. The effects of initial p H value, contact time, adsorbent dosage and temperature on its adsorption performances were examined. The results showed that the initial p H value had little effect on adsorption properties. The removal rate of PEG could reach 89% and equilibrium adsorption capacity was up to 59.95 mg/g when XAD-4 dosage was 0.3 g/L. PEG was loaded on XAD-4 resin with an uniform distribution. The isotherm data fitted well with Langmuir, Dubinin？Radushkevich and Sips models. The adsorption process was exothermic and spontaneous. The kinetic adsorption data fitted well with the pseudo-second-order model.