采用自制的弱酸离子交换纤维对红霉素的吸附和洗脱性能进行了研究,考察了温度、酸度及吸附时间等因素对吸附性能的影响.实验结果表明,pH值为7.0时吸附性能最好.离子交换纤维对红霉素的吸附以液膜扩散为主.静态饱和吸附量为1.79×10~5u/g干纤维,等温吸附过程服从Langmuir和Freundlich等温吸附方程.pH值为7.0,流速为5.0ml/min时对红霉素的动态吸附容量为4.54×10~5u/g干纤维.选用0.1mol/L CH_3COONH_4溶液进行洗脱,当洗脱液流速为5.0ml/min,用量为80ml时洗脱率为92.5%.离子交换纤维的吸附量和洗脱率与大孔树脂类似,吸附速率远大于大孔树脂,能再生重复使用,是一种优秀的红霉素吸附材料.
The adsorption and desorption characteristics of self-prepared weak-acid type ion-exchange fiber (IEF) for erythromycin (EM) were studied. The effects of temperature,acidity and adsorption time were observed. The results show that the optimum pH is 7. 0. The main exchange action of the fiber is the expansion of the liquid surface. The static saturated ion-exchange capacity of EM is 1. 79×10~5u/g dry fiber,and the adsorption behavior obeys the Langmuir isotherm and the Freundlich equation. When pH is 7. 0,flow speed of EM solution is 5. 0ml/min.the dynamic ion-exchange capacity is 4. 54×l0~5u/g dry fiber,whose 92. 5% can be eluted easily by 0. lmol/L CH_3COONH_4 solution as eluant at a flow rate 5. 0ml/min and elution volume of 80ml. Compared with macroporous resins,IEF has more fast speed of adsorption,similar ion-exchange capacity and elution rate,and can be regenerated,so IEF is a good adsorbent for EM recovery process.
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