NAD-150超高交联吸附树脂对苯甲醇动态吸附行为

摘要

室温下研究了流速、初始质量浓度及树脂用量对苯甲醇动态吸附的影响.结果表明在所研究的范围内树脂对苯甲醇的吸附容量受流速的影响较小,吸附容量随着苯甲醇初始质量浓度的增大而增大,随着吸附剂用量的增大而减小.当流速为4 mL/min、初始质量浓度为2 000 mg/L,吸附剂用量在2-3 g时,NAD-150超高交联吸附树脂对苯甲醇的吸附量为303.35 mg/g,Bohart-Adams 模型较Yoon and Nelson模型能更好地拟合不同条件下苯甲醇吸附的穿透曲线.脱附实验表明乙醇水溶液对苯甲醇的脱附效果显著优于甲醇水溶液,再生后的树脂可重复使用.实验所采用的NAD-150超高交联吸附树脂对实际废水中苯甲醇的处理能力要显著高于市售树脂AB-8和HPD-100.NAD-150以其对苯甲醇的吸附量高,处理效果好,可望应用于苯甲醇工业废水的处理中.%Effect of flow rate, initial mass concentration and resin dosage on the adsorption of benzyl alcohol was investigated on macroporous hyper-crosslinked resin NAD-150 at room temperature under dynamic condition.Results show that flow rate has little effect on the adsorption of benzyl alcohol, and the adsorption capacity of NAD-150 increases with the benzyl alcohol initial mass concentration increasing, while decreases with the sorbent dosage increasing.Absorption capacity of macroporous hyper-crosslinked resin NAD-150 for benzyl alcohol is 303.35 mg/g at flow rate of 4 mL/min, initial mass concentration of 2 000 mg/L and resin dosage of 2-3 g, and Bohart-Adams model fits better than Yoon and Nelson model in predicting the dynamic curves.Desorption results show that desorption efficiency by ethanol-water solution is much better than by methyl alcohol-water solution, and the regenerated resin can be used repeatedly.NAD-150 used in this experiment shows much higher adsorption capacity toward benzyl alcohol than HPD-100 and AB-8.NAD-150 with high adsorption capacity and efficiency is hoped to be used in the benzyl alcohol industry waste water treatment.