One application of an AFB is the purification of air. It begins by focusing the sun's ultraviolet light on particles of silica gel, which are coated with a fine layer of titanium dioxide catalyst. The uvlight then able to charge these particles. These positive and negative charged particles are then available to initiate various chemical reactions.DEM-Solutions July 11, 2011, EDEM Gives Boost to Green Technology, viewed 12 October 2013,
