The　titanium　dioxide/ZnAl-layered　double　hydroxide　(TiO2/ZnAI-LDH)　nanocomposite　was　first　prepared　using　the　co-precipitation　method,　and　the　TiO2/metal　mixed　oxide　(TiO2/MMO)　was　then　fabricated　by　annealing　the　TiO2/ZnAl-LDH　nanocomposite　at　430　degrees　C.　The　obtained　materials　were　characterized　by　means　of　techniques,　such　as　field　emission　scanning　electron　microscopy　(FE-SEM),　X-ray　diffraction　(XRD),　Fourier　transform　infrared　spectroscopy　(FT-IR),　UV-visible　diffuse　reflectance　spectroscopy　(DRS),　and　N-2　adsorption-desorption　(BET).　Photocatalytic　activities　of　the　TiO2/MMO　nanocomposite　was　evaluated　for　O-2　generation　from　aqueous　solutions　in　the　presence　of　AgNO3　(1　mmol)　as　the　sacrificial　agent　at　neutral　pH　and　room　temperature　under　visible-light　irradiation.　It　is　found　that　photocatalytic　activity　of　the　TiO2/MMO　sample　was　better　than　that　of　the　TiO2/ZnAl-LDH　sample,　which　could　be　attributed　to　the　reduction　in　bandgap　energy,　low　electron-hole　recombination,　and　high　surface　area.　An　O-2　generation　rate　of　371　pmol/(g　h)　was　achieved　over　20　mg　of　the　TiO2/MMO　nanocomposite　photocatalyst,　and　the　quantum　efficiency　for　O-2　generation　was　84%　at　400　nm.　Such　a　quantum　efficiency　was　the　highest　value　obtained　over　the　TiO2/MMO　sample　under　visible-light　illumination.　This　study　presents　a　novel　approach　for　water　oxidation　using　the　visible-light-responsive　TiO2/MMO　nanocomposite　photocatalyst,　which　might　be　applied　as　a　promising　candidate　in　solar　energy　conversion　and　environmental　science　for　highly　efficient　O-2　generation.　(C)　2019　Elsevier　B.V.　All　rights　reserved.