1. https://en.wikipedia.org/wiki/Photocatalysis
2. http://www.greenearthnanoscience.com/what-is-photocatalyst.php
3. http://www.mchnanosolutions.com/mechanism.html
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5. Bahadar KS, Faisal M, Rahman Mohammed M, Kalsoom A, Asiri Abdullah M, Anish K, Alamry Khalid A. Effect of particle size on the photocatalytic activity and sensing properties of CeO2 nanoparticles. International Journal of Electrochemical Science. 2013;8:7284-7297