TITANIUM SUNLIGHT. “Sunlight plus a common titanium pigment might be the secret recipe for ridding pharmaceuticals, pesticides and other potentially harmful pollutants from drinking water. Scientists combined several high-tech components to make an easy-to-use water purifier … in a boon for water purification in rural areas or developing countries.”
http://www.acs.org/content/acs/en/pressroom/newsreleases/2014/march/high-tech-materials-purify-water-with-sunlight.html