Interfacial Coordination Bonding-Assisted Redox Mechanism-Driven Highly Selective Precious Metal Recovery on Covalent- Functionalized Ultrathin 1T-MoS2

Rational design of functional material interfaces with well-defined physico-chemical-driven forces is crucial for achieving highly efficient interfacial chemical reaction dynamics for resource recovery. Herein, via an interfacial structure engineering strategy, precious metal (PM) coordination-active pyridine groups have been successfully covalently integrated into ultrathin 1T-MoS2 (Py-MoS2). The constructed Py-MoS2 shows highly selective interfacial coordination bonding-assisted redox (ICBAR) functionality toward PM recycling. Py-MoS2 shows state-of-the -art high recovery selectivity toward Au3+ and Pd4+ within 13 metal cation mixture solutions. The related recycling capacity reaches up to 3343.00 and 2330.74 mg/g for Au3+ and Pd4+, respectively. More importantly, above 90% recovery efficiencies have been achieved in representative PMs containing electronic solid waste leachate, such as computer processing units (CPU) and spent catalysts. The ICBAR mechanism developed here paves the way for interface engineering of the well-documented functional materials toward highly efficient PM recovery.

Automated summary

Through interfacial structure engineering, precious metal (PM) coordination-active pyridine groups were covalently integrated into ultrathin 1T-MoS2 to create Py-MoS2, which exhibits highly selective interfacial coordination bonding-assisted redox (ICBAR) functionality for PM recycling. Py-MoS2 shows state-of-the-art high recovery selectivity for Au3+ and Pd4+ in a mixture of 13 metal cations, with recovery capacities reaching 3343.00 and 2330.74 mg/g, respectively. Moreover, the ICBAR mechanism enables over 90% recovery efficiencies for representative PMs in electronic solid waste leachate, such as CPU and spent catalysts.