杯[4]芳烃修饰Amberlite XAD-4树脂去除水中双氯芬酸

通过偶氮化反应将合成的去叔丁基杯4]芳烃连接到Amberlite XAD-4树脂上,并且采用FTIR、SEM和TG/DTA法表征了杯4]芳烃修饰Amberlite XAD-4树脂的结构.结果表明,水溶液中杯4]芳烃修饰Amberlite XAD-4树脂对双氯芬酸的去除率远大于单独Amberlite XAD-4树脂和杯4]芳烃.双氯芬酸的浓度为20mg/L时,随着杯4]芳烃修饰AmberliteXAD-4树脂投加量的增加,双氯芬酸的去除率增加很快.当吸附剂量增加到80mg/L时,双氯芬酸的去除率为92.8%,并且达到吸附平衡,吸附的双氯芬酸量为34.02mg/g. Langmuir和Freundlich等温线与实验数据均有很好的拟合度.对热力学参数的计算表明,△H与△G负值显示出反应的放热和自发过程.

Removal of diclofenac on calyx [4] arene based Amberlite XAD-4 resin from aqueous solutions

The calyx 4] arene was synthesized and connected to Amberlite XAD-4 resin covalently through a diazotization bound. The structure of Amberlite XAD-4 resin base on calyx 4] arene was characterized using FT-IR, SEM and TG/DTA. The sorption results showed that Amberlite XAD-4 resin base on calyx 4] arene had much better removal to the diclofenac in aqueous solutions than Amberlite XAD-4 resin and calyx 4] arene which were presence alone in aqueous solutions. The removal rate of diclofenac increased rapidly with the calyx 4] arene modified Amberlite XAD-4 resin dosage. In the condition of DCF concentration was 20mg/L, when the Amberlite XAD-4 resin base on calyx 4] arene dosage came up to 80mg/L, the removal rate of diclofenac was 92.8% and reached equilibrium, the corresponding amount adsorbed was 34.02mg/g. Kinetic analyses were conducted using pseudo first-order and second-order models. The linear correlation coefficients and standard deviations of Langmuir and Freundlich isotherms were determined, and the results revealed that Langmuir and Freundlich isotherm were ?tted the experimental data well. The thermodynamic parameters calculated indicated, ΔH and ΔG were negative, which predicated adsorption process of diclofenac on f Amberlite XAD-4 resin base on calyx 4] arene resin was exothermic and spontaneous.