Effective recovery of AuCl4– using thiosemicarbazide and thiocarbohydrazide functionalized D301 resin

In this study, two novel adsorbents (TSCD301 and TCHD301) were successfully synthesized through ring-opening reaction between the amino of thiosemicarbazide or thiocarbohydrazide and the epoxy group of poly(glycidyl methacrylate). The adsorption performance and recognition selectivity of TCHD301 and TSCD301 toward AuCl 4 – were studied by batch adsorption experiments. The results showed that the equilibrium adsorption capacity of TSCD301 and TCHD301 toward AuCl 4 – could reach 410.76 and 566.59 mg·g –1 at 298 K and pH of 2, respectively. The adsorption process could be described using the pseudo-second-order model, and the adsorption behavior of AuCl 4 – on TSCD301 and TCHD301 was typical monolayer adsorption. In mixed solution, two adsorbents had excellent selectivity toward AuCl 4 – . In addition, the adsorption capacity of adsorbent did not change significantly in repeated adsorption-desorption experiment.