杯[4]芳烃修饰Amberlite XAD-4树脂对水介质中胆红素的吸附性能

通过偶氮化反应将杯4]芳烃接枝到Amberlite XAD-4树脂上,采用FTIR、SEM等方法,表征了杯4]芳烃修饰Amberlite XAD-4树脂的结构.吸附实验表明,杯4]芳烃修饰AmberliteXAD-4树脂对胆红素的吸附容量远远大于单纯Amberlite XAD-4树脂.在温度为25,℃,胆红素浓度为20,mg/L、吸附时间为2,h的条件下,胆红素的平衡去除率在90%以上;而相同条件下的单纯Amberlite XAD-4树脂对胆红素的去除率仅为32.8%.水溶液中修饰树脂达到吸附平衡的时间为2,h左右,而且温度越高达到平衡吸附的时间越短.在近中性(pH=5～7)条件下修饰树脂对胆红素的吸附容量达到最大值,为2.1,mg/g,但随pH的降低或增大吸附容量均迅速降低.

Adsorption Effect of AmberliteXAD-4 Resin Based Calix[4]arene on Bilirubin in Aqueous Medium

The calix4]arene is connected to Amberlite XAD-4 resin covalently through a diazotization reaction. The structure of Amberlite XAD-4 resin based on calix4]arene is characterized using FT-IR, SEM. The sorption results show that Amberlite XAD-4 resin based on calix4]arene has much better removal to the bilirubin in aqueous solutions than Amberlite XAD-4 resin which are presence alone in aqueous solutions. The removal rate of bilirubin is over 90% at equilibrium, at the conditions of 25℃, the concentration of bilirubin is 20 mg/L and the adsorption time is 2 h. At the same conditions, the removal of bilirubin from Amberlite XAD-4 resin is 2.8% alone. The equilibrium time is 2h and decreases with an increase in temperature. When the aqueous solution stays near the neutral （pH = 5 - 7）, the adsorption capacity of Amberlite XAD-4 resin modified with calix4]arene to the bilirubin reaches maximum value, which is 2.1 mg/g but the value decreases rapidly when the pH increases or decreases