Selective adsorption of AuCl4− on chemically modified D301 resin with containing N/S functional polymer

Abstract In this study, Poly(glycidyl methacrylate) (PGMA) was grafted onto the surface of the weak basic D301 resin. Subsequently, two new adsorbents, D301- g -EDAPGMA and D301- g -THIOPGMA, were obtained successfully through ringopening reactions between the epoxide rings of PGMA and the amine of ethylenediamine and thiourea. The adsorption and recognition properties of these two adsorbents for AuCl 4 − were studied through batch method. The experimental results showed that D301- g -EDAPGMA and D301- g -THIOPGMA possess strong adsorption ability and excellent recognition selectivity for AuCl 4 − , and pH has a great influence on the adsorption capacity in the studied pH range. The adsorption of D301- g -EDAPGMA and D301- g -THIOPGMA towards AuCl 4 − is a typical monomolecular layer adsorption. The adsorption capacity of D301- g -EDAPGMA and D301- g -THIOPGMA for AuCl 4 − reaches 274.7 and 300.4 mg g −1 at 298 K and pH of 2, respectively. D301- g -EDAPGMA and D301- g -THIOPGMA can be used to adsorb AuCl 4 − electively from gold-bearing chloride solution. In addition, the desorption of AuCl 4 − from adsorbent is effective using mixture of acetone and 1 mol L −1 of hydrochloric acid as eluent. Consecutive adsorption-desorption experiments showed that D301- g -EDAPGMA and D301- g -THIOPGMA could be reused with 1.9% of adsorption capacity loss.