E-waste to goldmine! Scientists find new method to extract gold from e-waste

Electronic waste, or e-waste, is a growing problem, posing environmental and health concerns. However, a recent breakthrough by researchers at ETH Zurich in Switzerland could turn this waste into a goldmine, literally. They have developed a novel and sustainable method to extract precious metals like gold from discarded electronics, potentially giving a new direction to e-waste management. Also Read: Total Lunar Eclipse 2026 in India: When and how to watch it - check time, cities, and online streaming details

The secret lies in a readily available and unexpected source: whey protein, a byproduct of cheesemaking. In their study, the researchers noted that by processing whey protein into a special “sponge” made of protein fibrils, they could selectively capture gold ions from dissolved e-waste. Also Read: ExoMiner++: NASA turns to AI to speed up the search for Earth-like exoplanets

This method boasts several advantages:

— Sustainability: Unlike traditional methods that use harsh chemicals and generate hazardous waste, the whey protein approach is environmentally friendly and utilises a waste product from the food industry. Also Read: Can electricity travel through air? Finland’s research offers a new clue

— Efficiency: The protein fibril sponges exhibit a high affinity for gold, efficiently extracting it from a mixture of other metals present in e-waste.

— Profitability: The researchers claim that for every dollar invested, the process can potentially yield $50 worth of recovered gold, making it a financially viable proposition.

In their experiments, the team successfully extracted a 450-milligram nugget of 22-carat gold from just 20 old computer motherboards. The process involved dissolving the motherboards in an acid bath, placing a protein fibre sponge in the solution, and then heating it to obtain gold ions as flakes. Further heating up the flakes converts into a gold nugget. The researchers said the nugget was 91 percent gold, while the remaining 9 percent included remains of copper — corresponding to 22 carats. This finding, published in the journal “Advanced Materials,” has generated considerable excitement, with experts suggesting it could significantly incentivise e-waste recycling and address the growing environmental concerns associated with it.

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While further research and development are needed to scale up the technology and ensure its commercial feasibility, this new technique offers a promising glimpse into a future where e-waste becomes a valuable resource rather than a growing environmental burden. It highlights the potential of innovative solutions to address complex challenges, paving the way for a more sustainable and profitable future.