Cooking up new ways to clean up our planet

August 8, 2017, Flinders University
Cooking up new ways to clean up our planet
Sulphur + cooking oil = magic mercury polymer. Credit: Flinders University

In a win-win for a cleaner planet, scientists have devised a way to use waste cooking oil and sulphur to extract the neurotoxin mercury from the environment.

For the first time, researchers have demonstrated that the dynamic new canola oil polymer can trap the most dangerous and common types of mercury pollution – mercury metal, mercury vapour and highly toxic organo-mercury compounds which harm both aquatic and terrestrial systems.

"Our previous research studied a single type of , so this is a significant advance," says award-winning Flinders University scientist Dr Justin Chalker.

"With the Minamata Convention on Mercury coming into force around the world this year, this discovery is an important advance in protecting the environment and human health," says Dr Chalker, Senior Lecturer in Synthetic Chemistry at Flinders University in Adelaide, South Australia.

"We can use this material to protect the environment by capturing toxic mercury pollution – a pernicious problem around the world, causing brain damage and loss of IQ points in unborn children.

"At the same time, every atom of the mercury-binding material can be derived from industrial byproducts, so this is also an exciting advance in recycling and re-purposing waste."

Credit: Flinders University

In the latest advancement of pioneering new technology at Flinders University, Dr Chalker and fellow researchers from around the world have combined second-hand cooking oil and sulphur – a common, low-cost byproduct from petroleum production – to produce a new kind of polymer to use in remediation of soil, water and even the air.

After absorbing mercury pollution, the novel rubber-like polymer changes colour to indicate the job is done. More of the affordable polymer mixture can then be placed in the area to continue to process.

Dr Chalker says the material is being tested in field trials at mining sites and areas where mercury-based fungicides are used.

Dr Justin M. Chalker says the latest development will enhance future sustainability and environmental protection, with few remediation methods readily and affordably available.

Credit: Flinders University
"Mercury is encountered in several industrial activities including oil and gas refining and coal combustion," he says. "Alarmingly, mercury and mercury-containing materials are still used intentionally at many chloralkali plants and in artisanal gold mining. Additionally, mercury-based fungicides are still used in certain agricultural sectors."

Dr Chalker says the largest source of globally is due to artisanal gold mining.

"In this practice, mercury metal is used to extract gold from ore," he says. "The mercury-gold amalgam that forms is then heated, often with a hand torch or on a cooking stove, to vaporise the mercury and isolate the gold.

"The mercury rich tailings and exposure to mercury vapour threaten the health of the nearly 15 million people involved in this process.

Credit: Flinders University
"Because our mercury-capturing material is made from waste, our goal is to provide a cost-effective and technically simple material for cleaning up at these gold mines."

The latest paper was published in Chemistry – A European Journal.

This research was funded by The Australian Government National Environmental Science Programme Emerging Priorities Funding and The Australian Research Council.

The -binding polymer is licensed for sale to Kerafast a US-based reagent company whose primary aim is to make unique laboratory-made research tools easily accessible to the global scientific community.

The Flinders University team is raising funds to develop a pilot reactor and production plant for the new polymers in South Australia.

Cooking up new ways to clean up our planet
A polymer made from canola oil and sulphur (left) can remove mercury metal from soil. After reacting with mercury metal, the polymer changes colour from brown to black. Credit: Flinders University

Explore further: Colour-change polymer offers sustainable solution to mercury contamination

More information: Max Worthington et al. Laying Waste to Mercury: Inexpensive Sorbents Made from Sulfur and Recycled Cooking Oils, Chemistry - A European Journal (2017). DOI: 10.1002/chem.201702871

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