Effective recovery of AuCl4− using D301 resin functionalized with ethylenediamine and thiourea.

In this study, two new adsorbents, D301- g -EDAPGMA and D301- g -THIOPGMA, were obtained successfully on the basic of chemically modified D301 resin using ethylenediamine and thiourea. The adsorption, recognition and recovery properties of these two adsorbents for AuCl 4 − were studied through batch method. The experimental results showed that these two adsorbents possess strong adsorption ability and excellent selectivity for AuCl 4 − , and pH has a great influence on the adsorption capacity in the studied pH range. The maximum adsorption capacity of D301- g -EDAPGMA and D301- g -THIOPGMA for AuCl 4 − reaches 298 and 326 mg·g − 1 at pH of 2, respectively. D301- g -EDAPGMA and D301- g -THIOPGMA possess very high selectivity coefficients for AuCl 4 − and these two adsorbents can be used to recover AuCl 4 − selectively from gold-bearing chloride solution. The extraction rate of these two adsorbents for AuCl 4 − could reach 98%. D301- g -EDAPGMA and D301- g -THIOPGMA have excellent regeneration property, and the consecutive adsorption-desorption experiments showed that they could be reused almost without any loss in the adsorption capacity. [ABSTRACT FROM AUTHOR]