Sorption behavior of strong acid cationic exchange fiber for indium

In (III) was quantitative adsorption by strong acid cationic exchange fiber (SACEF) in the medium of pH=2.50 sulphuric aicd. The statically saturated sorption capacity of SACEF was 153.8 mg·g ^-1. 0.5 mol·L ^-1 H ₂SO ₄ could be used as an eluant. The elution efficiency was 99%. The SACEF could be regenerated and reused without apparent decrease of sorption capacity. The sorption rate constant was k _287K=0.09379 g·mg ^-1·min ^-1, k _{300 K}=0.1159 g·mg ^-1·min ^-1, k _{321 K}=0.4046 g·mg ^-1·min ^-1 and k _{350 K}=0.6678 g·mg ^-1·min ^-1, respectively. The apparent sorption activation energy of SACEF for In (III) was 28.28 kJ·mol ^-1. The sorption behavior of SACEF for In (III) obeyed the Freundlich isotherm. The enthalpy change was ΔH=5.67 kJ·mol ^-1.