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A novel fiber containing sulfhydryl, carboxyl and amino groups (sPAN) with high adsorption capacity for mercury was facilely prepared by chemically grafting cysteine onto a commercial polyacrylonitrile (PAN) fiber in a one-step reaction.

A new type of ion-exchange fiber with amino groups, called RPFA-I, was prepared. The amino modification and stretching resistance of RPFA-I were characterized by FTIR spectrum, SEM test, and auto-tensile test, respectively, and the removal of arsenite and arsenate in solution by RPFA-I was investigated. The obtained experimental results show that RPFA-I fibers have fine mechanical properties, and the amino functional groups have grafted to the surface of the matrix material. The adsorption results show that RPFA-I has a high capacity and good adsorption kinetic property in removal of arsenate and arsenite at the trace level. The removal efficiency was 70% for arsenite and 93% arsenate, respectively, at the concentration of 5 mg/L. The isothermal adsorptions were correspondent to Langmiur/Frundlich adsorption equation, and the adsorption kinetics was fit to the Lagergren pseudosecond order rate equation. The adsorption of the used adsorbent could be efficiently regenerated by 0.1M NaOH in a simple way.

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