Titanium dioxide (TiO2) has considerable power as a photocatalyst—a material that captures light energy to accelerate chemical reactions that are otherwise difficult to achieve. One of its most promising applications is to degrade organic (carbon-based) contaminant molecules in waste-water. In the Journal of Colloid and Interface Science researchers in China and Australia report that controlling the thickness of the walls of extremely narrow TiO2 tubes can greatly increase the photocatalytic efficiency of the material.
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Source: Phys.org