Adsorption Behavior and Mechanism of 110~* Resin for Er(III)

The effect of the factors such as medium pH,temperature,absorption time,resin dosage etc.on absorption of rare-earth element ion Er~(3+) with 110~* resin and the adsorption behavior and mechanism are investigated.The results show that the optimal medium pH is 5.70 for Er~(3+) adsorption with 110~* resin and the static adsorption capacity is 317mg/g-dry resin,and the Er~(3+) on 110~* loaded resin can be quantitatively eluted by using 1.0～2.0 mol·L~(-1) hydrochloric acid as an eluent.The adsorption process is consonant with the Freundlich isotherm equation with b between 2～10.The thermodynamic parameters of adsorption reaction are ΔH=16.5kJ·mol~(-1),ΔS=58.7J·mol~(-1)·K~(-1),ΔG=-1.00 kJ·mol~(-1).The apparent activation energy is E_a=31.3kJ·mol~(-1) and the reaction rate constant is k_(298)=1.84×10~(-5)s~(-1).The atom H in C-OH and atom O in C=O on 110~* resin interact with Er~(3+) to form the complex.