Schematic flow diagram for the sol-gel synthesis of the ZnO-TiO2 nanocomposites using a structure directing surfactant template.
XRD profiles of ZnO-TiO2 composites prepared with different Zn2+ loading and calcined at 500 °C for 5 h.
HRTEM images of 50ZnO composite prepared by the sol-gel method and annealed at 500 °C, confirming a spherical structure with lattice fringes 3.5 Å and 2.5 Å of (101) and (101) planes, respectively, corresponding to TiO2 and ZnO. The images (a) and (b) show particle size and lattice fringes, respectively. The image (b) is the magnified TEM image of 50ZnO composite showing a close neighborhood contacts between ZnO and TiO2 nanoparticles.
Nitrogen physisorption isotherms (a) and corresponding pore size distribution (b) of mesoporous ZnO and ZnO-TiO2 composites prepared by sol-gel method.
UV-visible DRS of ZnO-TiO2 composites and ZnO, which were calcined at 500 °C for 5 h.
Raman spectra of all samples prepared in this study.
Nyquist plots of commercial TiO2 P25, and ZnO, 10ZnO, 30ZnO, and 50ZnO nanocomposites, which were annealed for 5 h at 500 °C. The frequency range was 300 kHz-50 mHz with amplitude of 10 mV.
Photocatalytic H2 evolution from water-methanol media in the presence of coupled ZnO-TiO2 composites relative to commercial TiO2 P25 and pure phase ZnO.
Schematic representation showing electron/hole separation process at coupled ZnO-TiO2 heterojunction interface.
Photocatalytic activities of ZnO-TiO2 nanocomposites for H2 production from an aqueous methanol solution.
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