Smog-Eating Building Products Could Produce Smog - News - Greensource Magazine

Titanium dioxide (TiO2 ) is in everything these days, from toothpaste to latex paint. Valued for opacity, it’s also a powerful antimicrobial and the key ingredient in “smog-eating” building products. That’s because TiO2 acts as a catalyst in the presence of UV light, helping break down virtually any organic compound—whether it’s a bacterium or a formaldehyde molecule. Photo courtesy Jonathan Raff Graduate students in the Raff laboratory are recording conditions of an experiment to investigate the amount of NOx produced when TiO2 in the presence of ammonia is irradiated with simulated sunlight. ----- Advertising ----- But TiO2 ’s reactivity may be harder to control than previously thought. New findings suggest the chemical could actually produce more smog-forming chemicals than it breaks down. Studies of smog-eating coatings typically look at the direct conversion of the sm...

Full article: http://greensource.construction.com/news/2013/08/130813-s...

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