Adsorption properties of ion-exchange fiber for erythromycin

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 1.79×10⁵ u/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 5.0 ml/min, the dynamic ion-exchange capacity is 4.54×10⁵ u/g dry fiber, whose 92.5% can be eluted easily by 0.1 mol/L CH₃COONH₄ solution as eluant at a flow rate 5.0 ml/min and elution volume of 80 ml. 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.