(436h) ZrO2 Incorporated ZnO/TiO2 Mesoporous Photocatalyst for H2 Generation

Authors: 
Hussein, A., South Dakota Shool of Mines and Technology
Shende, R., South Dakota School of Mines and Technology



The present research deals with the synthesis of ZrO2 incorporated coupled ZnO/TiO2 photocatalyst and its effectiveness on H2 generation from aqueous methanol solution.  Ordered mesoporous ZrO2 supported coupled TiO2/ZnO materials were synthesized using surfactant as structure directing agent, titanium isopropoxide, zinc acetate dihydrate and zirconium n-propoxide precursors.  The ZrO2 incorporated coupled ZnO/TiO2composites were characterized by XRD, UV-Vis spectra, SEM/TEM, XRF, Raman and N2 adsorption-desorption isotherm.  Photocatalytic hydrogen evolution was carried out in a 7 mL quartz reactor at ambient temperature.  The focused intensity and area on the quartz cuvette were 0.60 W and 2 cm2, respectively.  In a typical experiment, 2.0 mg of ZrO2/ZnO-TiO2 photocatalyst was dispersed in 3.5 mL of H2O containing 0.5 mL methanol or 10 mg biomass as a sacrificial agent.  A 300 W xenon lamp (Oriel) equipped with a UV-filter (240 nm - 400 nm) was employed as the light source.  Prior to irradiation, the suspension of the catalyst was degassed with ultrapure nitrogen for 30 min to completely remove the dissolved oxygen and to ensure the reactor in an anaerobic condition.  From 3 mL reactor overhead space, 0.1 mL of gaseous samples were withdrawn periodically and analyzed using the gas chromatograph (GC), from which photocatalytic effectiveness towards H2  generation was evaluated and compared with coupled  TiO2/ZnO material.