Embodiments of the technology disclosed herein include exemplary gas purifiers that use cyclonic separation and photocatalytic purification to oxidize contaminants in unpurified gas. One such gas purifier includes a vessel that defines a tapered cyclonic chamber. Unpurified gas enters the chamber and induces a gas vortex. Photocatalytic particles in the chamber become suspended in the vortex and mix with contaminants in the incoming gas. A light source activates the photocatalytic particles, which oxidize the contaminants to purify the gas. The purified gas exits via the wide of end of the chamber. Cyclonic action forces the photocatalytic particles out of the chambers narrow end to a recycling conduit, which conveys the photocatalytic particles back into the chamber.
