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Gold’s importance in various industries, the ever-rising demand for electronics, and shrinking gold reserves all underscore the pressing need to develop effective gold recovery methods from waste. In this study, we systematically evaluate several large-pore Zirconium-carboxylate Metal–Organic Frameworks (Zr-MOFs) having slightly varied internal surface functionality (-H, -CH3, -NH2, and -NO2) in gold recovery from acidic, simulated e-waste solutions. We compare two Zr-MOFs constructed from oligophenylene ligands with four MOFs built from structurally analogous piperazine-based ligands, including two unreported frameworks. The piperazine-based frameworks offer a critical sustainability advantage: by replacing the central benzene core with piperazine, they eliminate the need for expensive Pd-catalyzed coupling chemistry required for oligophenylene synthesis. In this work, we demonstrate for the first time that Zr-piperazine MOFs exhibit stability in acidic conditions, significantly surpassing their oligophenylene-based counterparts. One developed Zr-piperazine MOF, functionalized with both amine and methyl groups, substantially outperforms all analogs, displaying the highest stability alongside a gold adsorption capacity of up to 1826 mg/g and rapid adsorption kinetics in a 40 ppm gold solution. X-ray Absorption Near-Edge Structure (XANES) studies reveal distinct gold adsorption mechanisms for primary versus tertiary amines. These findings establish piperazine-based building blocks as promising candidates for designing selective gold adsorbents for e-waste recovery applications.

Don't throw it out.

Scientists are revolutionizing e-waste recycling by extracting gold with eco-friendly methods and transforming CO2 into valuable chemicals.

Highlights:

Learn how gold is recovered from old phones and laptop motherboards, its value, process overview, and safe, legal ways to handle e-waste.

Over 60 Lokayukta cops in Madhya Pradesh transferred amid raids recovering gold, cash, and real estate documents linked to ex-RTO constable turned real estate developer Saurabh Sharma, now under money...

The CBI recovered 800 gm of gold and registered a disproportionate assets case on Sunday against a Senior Section Engineer of East Central Railway, Patna, an official statement said on Monday.

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Electronic waste from discarded computers is a growing challenge. Credit: Flinders University Researchers have developed a “low-cost, sustainable, simple and safe” approach to extract gold from ore,...