Continuous extraction and separation of Cu (II), Zn (II), Co (II), Ni (II) by using modified polymer affinity liquid-solid extraction system

The polyethylene glycol (PEG)8000 was modified with iminodiacetic acid (IDA). The polymer-salt-H2O liquid-solid affinity extraction system composed by Tween80 mixed PEG-(IDA), was used to selectively concentrate and separate metal ions. The quantitative continuous extraction of Cu(II),Zn(II),Co(II) and Cu(II), Zn(II), Ni(II) were carried out by controlling the optimal conditions: The concentration of forming phase polymer Tween 80 was 5 similar to 10%; PEG-(IDA)(2) concentration was 0.1%; (NH4)(2)SO4 concentration was 1.14 similar to 1.67 mol/L; the solution adity was pH 3.20 similar to 7.00. The extraction mechanism was discussed initially. The enriching of trace Cu(II) and Zn(II) from water and fair etc. was successfully achieved. The results are satisfactory.