Fig. 4: Investigation of PM recovery with simulated feed solutions and demonstration of the practical feasibility. | Nature Communications

Fig. 4: Investigation of PM recovery with simulated feed solutions and demonstration of the practical feasibility.

From: Efficient recovery and recycling/upcycling of precious metals using hydrazide-functionalized star-shaped polymers

Fig. 4

a–d Recovery efficiency (Re) of the polymers (S-PAcH(L), bPEI, and PAAm) with simulated leachate and groundwater feed solutions: (a) CPU leachate, (b) spent Pd catalyst leachate, (c) spent Pt catalyst leachate, and (d) groundwater (Au) (polymer concentration = 0.2 g L–1, solution pH = 2, contact time = 3 h). e Schematic of the process of selective PM recovery from a complex metal feed solution using S-PAcH. f Refinement of the PM/S-PAcH(L) precipitates into pure PMs (top) and their direct catalytic application to dye (MO and 4-NP) reduction (bottom). g UV-vis spectra of organic dye (MO and 4-NP) solutions containing NaBH4 before (control) and after the addition of the S-PAcH(L) or PM/S-PAcH(L) precipitates.

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