Discharged in large quantities by textile, cosmetic, ink, paper and other manufacturers, dyes carry high-toxicity and can bring potential carcinogens to wastewater. It’s a major concern for wastewater treatment — but researchers may have found a solution, using a tiny nanofilament.
Discharged in large quantities by textile, cosmetic, ink, paper and other manufacturers, dyes carry high-toxicity and can bring potential carcinogens to wastewater. It's a major concern for wastewater treatment -- but researchers in Drexel University's College of Engineering may have found a solution, using a tiny nanofilament.
The process starts with adsorption, where the dye adheres to the surface of the nanofilament, and once illuminated undergoes photocatalysis. The dye sensitizes the nanofilaments to visible light. This process accelerates degradation, allowing the dye to break apart into harmless byproducts such as carbon dioxide and water.
The most common wastewater treatment methods, such as sedimentation, biological oxidation and chemical-physical treatment, are ineffective at removing dyes, according to the researchers, due to the dyes' complex molecular structure and water-soluble nature. "The use of visible light -- light the human eye can see -- like the sun or other simulated light sources, could significantly reduce the financial and energy consumption costs associated with treatment, while still being highly effective at removing dyes from wastewater, eliminating the toxic effluents," said Adam Walter, a doctoral student in Barsoum's research group, and the first author on the paper, in the Department of Materials Science and Engineering.
In addition, while this study showed proof that the nanofilament could be leveraged to improve water treatment capability, it also serves as first proof that the materials can be sensitized, opening the door to other applications in solar cells and optical devices. Earlier this year, the same nanofilament was studied by the team and found to harness sunlight for hydrogen separation, which could unlock its potential in green fuel generation.
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Titanium oxide material can remove toxic dyes from wastewaterDischarged in large quantities by textile, cosmetic, ink, paper and other manufacturers, dyes carry high-toxicity and can bring potential carcinogens to wastewater. It's a major concern for wastewater treatment—but researchers in Drexel University's College of Engineering may have found a solution, using a tiny nanofilament.
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