The presence of toxic metals in industrial wastewater makes wastewater treatment a daunting task, and contaminated liquids can contaminate groundwater supplies for years or even decades,media reported. In response, scientists at Nagoya University in Japan have proposed a new technique for more efficient heavy metal ion filtration using charged nanocarbons.
Nano carbide is a tiny carbon-based material that can be combined with heavy metal ions such as lead and mercury by molecular force, so it shows very good development potential in water purification applications. However, the adsorption is so weak that scientists at Nagoya University are trying to find a way to increase it. So they thought of adding molecules to nanocarbides such as aminos that could form stronger chemical bonds with metals. The team studied this possibility by using phenol as a carbon material and mixing it with a compound called APTES as an amino base.
These ingredients are placed in a glass container and exposed at high-voltage currents for more than 20 minutes, eventually distributing the amino groups evenly on the surface of the nanocarbon.
“Our one-step approach promotes the binding of ammonia on the surface inside and outside of porous nanotubes,” said Nagahiro Saito, a materials scientist at Nagoya University. Compared to the nanocarbons themselves, this greatly increases their adsorption capacity. “
The team then tested the nanocarbide in experiments and compared its properties with other carbons produced by traditional methods. Among them, the adsorption capacity of charged nanocarbon is the highest. In another experiment, the team performed 10 adsorption cycles of nanocarbides with metal ions such as copper, zinc and cadmium, and found that although the performance of nanocarbides declined each time, the decline was very small, indicating that nano carbide was highly reusable.
“Our approach can help reduce the cost of water purification, bringing us closer to achieving safe and affordable drinking water for all by 2030,” Saito said. “
The study was published in ACS Applied Nano Mater Iasl.