Adsorption and separation of rhenium(VII) using N‐methylimidazolium functionalized strong basic anion exchange resin

Abstract

BACKGROUND: Rhenium is a rare and valuable metal coexisting with molybdenum in molybdenite and sulfide copper ores and is hard to separate. Methods such as solvent extraction, ion exchange, adsorption, precipitation, etc. have been used to separate and purify Re(VII), and resin ion exchange has been widely investigated and used owing to its convenient operation and relatively low-cost. The main challenge comes from the preparation of resins having high performance and stability. In an earlier study, an N-methylimidazolium functionalized strong basic anion exchange resin was successfully synthesized and used for Cr(IV) extraction. This paper, reports on further synthesis and application of this resin for adsorption and separation of Re(VII) and Mo(VI), especially from copper arsenic filter cake. RESULTS: At pH 6.25, Re(VII) and Mo(VI) can be effectively separated with the N-methylimidazolium functionalized strong basic anion exchange resin, giving a Re(VII) recovery of up to 93.3%, but only 5.1% for Mo(VI). When using the copper arsenic filter cake sample 89.1% Re(VII) recovery was achieved. CONCLUSION: The N-methylimidazolium functionalized strong basic anion exchange resin exhibited high selectivity and recovery for Re(VII) in a mixed system.

Selective magnetic GMA based potential sorbents for molybdenum and rhenium sorption

“…Distribution factor (D) and separating factor (β Re/Mo ) were calculated from Equations 3 and 4 [8]:…”

“…Several methods of separating molybdenum and rhenium have been described in the literature, like ion exchange, precipitation, adsorption and solvent extraction [8]. Among them, adsorption is accepted as one of the most effective and economic method for wastewater treatment [4,[7][8][9].…”

Novel paper‐templated fabrication of hierarchically porous Ni–Al layered double hydroxides/Al2O3 for efficient BSA separation

“…The decreased BSA adsorption capacity with increasing temperature may be attributed to the exothermic nature of the adsorption. In order to further investigate the BSA adsorption process, the equilibrium experimental data were further analyzed by three commonly used isotherm models, namely Langmuir, Freudlich and Dubinin–Radushkevich (D‐R) equations. As shown in Fig.…”

“…The decreased BSA adsorption capacity with increasing temperature may be attributed to the exothermic nature of the adsorption. In order to further investigate the BSA adsorption process, the equilibrium experimental data were further analyzed by three commonly used isotherm models, namely Langmuir, 19 The effect of adsorption time on BSA adsorption was investigated at an ambient temperature of 25 • C. Figure 7 shows the sorption kinetics of BSA on paper-based Ni-Al LDHs/Al 2 O 3 composites at initial BSA concentrations of 300 mg L −1 , 500 mg L −1 and 700 mg L −1 , respectively. It can be seen that the adsorption capacity of composites increased with increasing sorption time.…”

A Mini-Review on Anion Exchange and Chelating Polymers for Applications in Hydrometallurgy, Environmental Protection, and Biomedicine

“…Taking into account the obtained results, the anion exchange resin, based on the enhanced VBCco-DVB copolymer modified in MV-field, revealed great adsorption capacity (303 mg Re g −1 ), but, most important, the resin revealed a 200-fold greater selectivity toward Re(VII), as compared to excess of Mo(VI), V(V), and Cu(II). This allowed for proposing a solution for the hydrometallurgical challenge of separating Re from Mo [31][32][33][34][35][36]. The activity involving new IX and chelating materials for hydrometallurgy was also aimed on the resins for the recovery of Au from wasted electric and electronic equipment (WEEE).…”