Abstract:Titanium dioxide (TiO₂) has been emerging as the most extensively studied photocatalyst due to its advantages of physicochemical stability, cost efficiency and non-toxicity. To tackle the difficulties in recycling the particulate photocatalyst and the problems of potential secondary pollution, practical use of TiO₂ in coating form has been an ideal choice. Thermal spray technology offers the advantages of high coating fabrication efficiency and ease of economic large-scale deposition, and has attracted attention in making nano-TiO₂ coatings. This paper reviews the current research status of plasma spray, flame spray, high velocity oxy-fuel spray and cold spray techniques in depositing TiO₂ coatings for photocatalytic performances. Correlation between the key spray factors and the properties of the photocatalytic coatings is summarized. The tailored microstructure and photocatalytic activities of the coatings made by the various thermal spray techniques are comprehensively discussed, and the prospective development of thermal sprayed photocatalytic coatings is addressed.