From Electronic Waste to Suzuki−Miyaura Cross‐Coupling Reaction in Water: Direct Valuation of Recycled Palladium in Catalysis

Abstract

From electronic waste to Pd-catalyzed reaction! The straightforward valuation of palladium recovered from electronic waste is reported here. Following a classical leaching stage, palladium is selectively extracted from a complex aqueous mixture of metallic cations into an organic phase. Afterwards, the judicious choice of a surfactant enables stabilization of palladium during back extraction cycles, and the direct preparation of an aqueous micellar solution, which can be employed in a model SuzukiÀ Miyaura cross-coupling reaction. Clean phase separation is observed, and distribution of all components between organic and aqueous phases is mastered. The proposed process avoids several waste generating steps dedicated to palladium isolation and ultimate purification, as well as the preparation of palladium pre-catalyst. This novel approach enables a better use of both natural resources and industrial wastes, through new cycles in circular economy.

From Waste to Green Applications: The Use of Recovered Gold and Palladium in Catalysis

“…In a recent report, Bourgeois et al described a process for recovering palladium as a catalytic micellar solution from multi-layer ceramic capacitors (MLCC) recovered from WEEE. The group employed their previously reported recovery process, which involved selective dissolution of silver and palladium from the gold present using a heated (50 • C) 3M nitric acid solution [98]. After leaching, palladium was selectively extracted using one of two organic extractants tested (L1 and L2), followed by back-extraction with a surfactant based on tris-(hydroxymethyl)acrylamide (S1) (Figure 9).…”

“…Micellar back-extraction of recovered palladium [98]. Reproduced with permission [98] The group then explored the catalytic activity of their micellar palladium solution.…”

“…Micellar back-extraction of recovered palladium [98]. Reproduced with permission [98] The group then explored the catalytic activity of their micellar palladium solution. Initially, S1 was loaded with Pd(OAc)2 and used to catalyse the Suzuki-Miyaura coupling of m-bromoanisole and phenyl boronic acid in the presence of P( t Bu)3.…”

From Mobile Phones to Catalysts: E-Waste-Derived Heterogeneous Copper Catalysts for Hydrogenation Reactions

“… Metal-rich PCBs are excellent raw materials for the preparation of various metal nanoparticles (NPs): Ag NPs on C, Cu 2 O NPs, Cu NPs, , Cu–Sn NPs, and PbO NPs . Although a variety of materials can be obtained, only a few have been shown to possess interesting catalytic properties and are typically limited to the degradation of organic dyes. , Notably, Bourgeois and co-workers reported a method for selective palladium extraction from electronic waste, which was further stabilized by surfactants in the aqueous phase . It has been demonstrated that these Pd solutions can serve as a convenient medium for Suzuki–Miyaura coupling reactions.…”

“…16,17 Notably, Bourgeois and co-workers reported a method for selective palladium extraction from electronic waste, which was further stabilized by surfactants in the aqueous phase. 18 It has been demonstrated that these Pd solutions can serve as a convenient medium for Suzuki−Miyaura coupling reactions.…”