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Novel photocatalysts Y 2 MSbO 7  (M = Ga, In, Gd) were synthesized by the solid state reaction method for the first time. A comparative study on the structural and photocatalytic properties of Y 2 MSbO 7  (M = Ga, In, Gd) was reported. The results showed that Y 2 GaSbO 7 , Y 2 InSbO 7  and Y 2 GdSbO 7  crystallized with the pyrochlore-type structure, cubic crystal system, and space group  Fd3m . The lattice parameter for Y 2 GaSbO 7  was 10.17981 Å. The lattice parameter for Y 2 InSbO 7  was 10.43213 Å. The lattice parameter for Y 2 GdSbO 7  was 10.50704 Å. The band gap of Y 2 GaSbO 7  was estimated to be 2.245 eV. The band gap of Y 2 InSbO 7  was 2.618 eV. The band gap of Y 2 GdSbO 7  was 2.437 eV. For the photocatalytic water-splitting reaction, H 2  or O 2  evolution was observed from pure water with Y 2 GaSbO 7 , Y 2 InSbO 7  or Y 2 GdSbO 7  as catalyst under visible light irradiation. (Wavelength > 420 nm). Furthermore, H 2  and O 2  were also evolved by using Y 2 GaSbO 7 , Y 2 InSbO 7  or Y 2 GdSbO 7  as a catalyst from CH 3 OH/H 2 O and AgNO 3 /H 2 O solutions, respectively, under visible light irradiation (λ > 420 nm). Y 2 GaSbO 7  showed the highest activity compared with Y 2 InSbO 7  or Y 2 GdSbO 7 . At the same time, Y 2 InSbO 7  showed higher activity compared with Y 2 GdSbO 7 . The photocatalytic activities were further improved under visible light irradiation with Y 2 GaSbO 7 , Y 2 InSbO 7  or Y 2 GdSbO 7  being loaded by Pt, NiO or RuO 2 . The effect of Pt was better than that of NiO or RuO 2  for improving the photocatalytic activity of Y 2 GaSbO 7 , Y 2 InSbO 7  or Y 2 GdSbO 7 .

Photocatalytic Water Splitting for Hydrogen Production with Novel Y2MSbO7 (M = Ga, In, Gd) under Visible Light Irradiation