Affiliation:
1. School of Civil Engineering Kashi University Kashi 844000 P. R. China
2. Research Center for Environmental Functional Materials State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 P. R. China
3. College of Oceanography and Ecological Science Shanghai Ocean University No 999 Huchenghuan Road Shanghai 201306 P. R. China
Abstract
AbstractThere are enormous economic benefits to conveniently increasing the selective recovery capacity of gold. Fe/Co‐MOF@PDA/NdFeB double‐network organogel (Fe/Co‐MOF@PDA NH) is synthesized by aggregation assembly strategy. The package of PDA provides a large number of nitrogen‐containing functional groups that can serve as adsorption sites for gold ions, resulting in a 21.8% increase in the ability of the material to recover gold. Fe/Co‐MOF@PDA NH possesses high gold recovery capacity (1478.87 mg g−1) and excellent gold selectivity (Kd = 5.71 mL g−1). With the assistance of an in situ magnetic field, the gold recovery capacity of Fe/Co‐MOF@PDA NH is increased from 1217.93 to 1478.87 mg g−1, and the recovery rate increased by 24.7%. The above excellent performance is attributed to the efficient reduction of gold by FDC/FC+, Co2+/Co3+ double reducing couple, and the optimization of the reduction reaction by the magnetic field. After the samples are calcined, high‐purity gold (95.6%, 22K gold) is recovered by magnetic separation. This study proposes a forward‐looking in situ energy field‐assisted strategy to enhance precious metal recovery, which has a guiding role in the development of low‐carbon industries.
Funder
National Natural Science Foundation of China
Aeronautical Science Foundation of China