LAUSR

The (P, N, Mo)-TiO2 photocatalyst particles were intuitively synthesized using spray drying method followed by solid-state cold spraying. Imperatively, (P, N, Mo)-TiO2 photocatalyst coatings were deposited on aluminum substrate by cold spraying. The (P, N, Mo)-TiO2 powders were initially prepared by sol-gel method, which exhibited the characteristics of a polygonal particles with a primary particle size of 20 nm and a mean size of 2μm.The synthesized (P, N, Mo)-TiO2 powders were agglomerated into spherical particles with a mean size of 5μm by spray drying method. The agglomerated powders depicted a good flowability, wettability and were suitable for cold spray deposition. The successful (P, N, Mo)-TiO2 coatings exhibited good interfacial bonding with the substrate, with an average coating thickness of 15 μm. The properties of the synthesized (P, N, Mo)-TiO2 powders and coatings were analyzed by advanced modern techniques, including XRD, XPS, UV-Vis, SEM and TEM. The photocatalytic performance of (P, N, Mo)-TiO2 coatings were investigated under visible light. Cold sprayed (P, N, Mo)-TiO2 coatings exhibited excellent photocatalytic activity in MB degradation under visible-light irradiation. The (P, N, Mo)-TiO2 coating sprayed at 500 ℃ revealed the highest photodegradation rate of 38 % in 4 h. Proactively, the doping mechanism and photocatalytic mechanism of (P, N, Mo)-TiO2 coatings were also effectively proposed and discussed.