An innovation in liquid metal chemistry could help one tenth of the planet’s population get access to clean drinking water at very low cost following breakthrough research from UNSW Sydney and RMIT.
UNSW and RMIT researchers have discovered a revolutionary and cheap way to make filters that can turn water contaminated with heavy metals into safe drinking water in a matter of minutes.
Recent UNSW SHARP hire Professor Kourosh Kalantar-zadeh and his former colleagues at RMIT showed that nano-filters made of aluminium oxide could be cheaply produced using virtually no energy from a fixed amount of liquid metal gallium.
In a paper published in Advanced Functional Materials, lead author Dr Ali Zavabeti (RMIT) and Professor Kalantar-zadeh explained that when a chunk of aluminium is added to the core of liquid gallium at room temperature, layers of aluminium oxide are quickly produced at the surface of the gallium.
The authors discovered that these aluminium oxide nano-sheets were highly porous and went on to prove they were suitable for filtering both heavy metal ions and oil contamination at unprecedented, ultra-fast rates.
Professor Kalantar-zadeh, who was recently awarded an ARC Australian Laureate Fellowship soon after joining UNSW’s School of Chemical Engineering, said that low cost and portable filters produced by this new liquid metal based manufacturing process could be used by people without access to clean drinking water to remove substances like lead and other toxic metals in a matter of minutes.
“Because it’s super porous, water passes through very rapidly,” Professor Kalantar-zadeh said.
“Lead and other heavy metals have a very high affinity to aluminium oxide. As the water passes through billions of layers, each one of these lead ions get attracted to one of these aluminium oxide sheets.
“But at the same time, it’s very safe because with repeated use, the water flow cannot detach the heavy metal ions from the aluminium oxide.”
Professor Kalantar-zadeh believes the technology could be put to good use in Africa and Asia in places where heavy metal ions in the water are at levels well beyond safe human consumption. It is estimated that 790 million people, or one in 10 of the Earth’s population, do not have access to clean water.
“If you’ve got bad quality water, you just take a gadget with one of these filters with you,” he said.
“You pour the contaminated water in the top of a flask with the aluminium oxide filter. Wait two minutes and the water that passes through the filter is now very clean water, completely drinkable.
“And the good thing is, this filter is cheap.”
There are portable filtration products available that do remove heavy metals from water, but they are comparatively expensive, often costing more than $100.
By contrast, aluminium oxide filters produced from liquid gallium could be produced for as little as 10 cents, making them attractive to prospective manufacturers.
“Up until now, to produce aluminium oxide, you need to process aluminium at above 1000 degrees or use other energy intensive processes,” Professor Kalantar-zadeh said.
“It would normally consume so much energy to make anything like this filter, making it hugely expensive.
“Now we’re talking about something you can do even under the sun in summer at 35 degrees.”
While aluminium is a plentiful and cheap metal, gallium is relatively expensive. But what makes gallium the hero in the process is the fact that it remains pure and unchanged after each production of aluminium oxide.
“You just add aluminium to the gallium and out comes aluminium oxide when its surface is exposed to water. You can use gallium again and again. Gallium never participates in the reaction,” Professor Kalanter-zadeh said.
Professor Kalantar-zadeh said the manufacture process is so cheap and requiring such low expenditure of energy, these filters could even be made out of a kitchen.
“We are publishing this concept and releasing it to the public domain, so people around the world can use the idea for free and implement it for enhancing the quality of their lives,” he said.
“This is all about a new paradigm. We haven’t even begun to explore how we can use liquid metals as a base for manufacturing things that are cheap, green and safe for humans.”
The Latest on: Water purification
via Google News
The Latest on: Water purification
- San Antonio-based North American Development Bank Moves From Waste Water Treatment To Mass Transit in Mexico.on September 6, 2019 at 9:09 pm
San Antonio’s North American Development Bank is known for funding water-treatment facilities and other essential but dull capital projects in mostly poor communities along the U.S.-Mexican border.
- 'We are not happy people over this,' residents say water tastes like dirton September 6, 2019 at 7:29 pm
Columbia Water issued a statement last week saying: "Columbia Water customers who are served from the Lake Murray Water Treatment Plant may have noticed an earthy smell or taste to their tap water ...
- Water treatment plant plan at Chikhali put on hold againon September 6, 2019 at 3:46 pm
edited, 400 words Pimpri Chinchwad: The standing committee of the civic body has for the second time put on hold the proposal to construct a 100 MLD treatment plant at Chikahli and tide over the ...
- Produced Water Treatment Market: 2019 Size, Share, Industry Trends, Growth Factors, Key Players, Regional Analysis With Global Forecast To 2027on September 6, 2019 at 7:48 am
Produced Water Treatment Market is expected to gain highest growth during the forecast period of 2019 to 2027. Fresh Water Scarcity to Drive Global Produced Water Treatment Market. Produced Water ...
- Industrial Water Purification System Market Analysis, Size, Share, Growth and Opportunity Assessment till 2025on September 6, 2019 at 5:05 am
Sep 06, 2019 (AmericaNewsHour) -- Global Industrial Water Purification System Market - Drivers, Restraints, Opportunities, Trends, and Forecast up to 2025 By End-Users (Energy and Mining industry, Oil ...
- Produced Water Treatment Market Analysis, Strategies, Segmentation and Forecasts 2019-2028on September 5, 2019 at 11:26 pm
Sep 06, 2019 (WiredRelease via COMTEX) -- The report attempts to offer high-quality and accurate analysis of the Global Produced Water Treatment Market, keeping in view market forecasts, competitive ...
- Poughkeepsie's water treatment gets a $4.5 million upgradeon September 4, 2019 at 4:07 pm
A multi-million dollar project will help ensure City and Town of Poughkeepsie residents continue to have safe drinking water. That's according to the City of Poughkeepsie, which announced a $4.5 ...
- Enjoy Higher Quality Water at Home With AZ Water Softening Treatment from Pristine Water Softenerson September 4, 2019 at 3:56 pm
Pristine Water Softeners is a company dedicated to providing wellness to their customers through their highly reliable water treatment products. Gilbert, AZ – Pristine Water Softeners is a company ...
- Industrial Water Purification System Market 2019-2025: Advancements in Water Purification Methodson September 4, 2019 at 7:45 am
DUBLIN, Sept. 4, 2019 /PRNewswire/ -- The "Industrial Water Purification System Market By End-Users, By Technology, By Treatment (Raw Water Treatment Systems, Boiler Feed Water Treatment Systems ...
via Bing News