281746 Hydrogen Generation Using Coupled ZnO/TiO2 Photocatalyst Oxides

Wednesday, October 31, 2012: 1:50 PM
307 (Convention Center )
Abdulmenan Hussein, Chemical and Biological Engineering, South Dakota Shool of Mines and Technology, Rapid City, SD and Rajesh V. Shende, Chemical and Biological Engineering Department, South Dakota School of Mines and Technology, Rapid City, SD

In most cases, coupled semiconductor oxide photo-catalysts, have activities superior to those of pure photo-catalyst oxides.  A systematic study of the nature of interaction between component semiconductor oxides, mode of preparation, surface orientation and surface area, composition of the simple binary oxide systems in relation to its photo-catalytic activity in water splitting could give a clearer picture of the origin of modified photo-activity in them.  A systematic study and effectiveness of different forms of coupled titania and zinc oxide compositions for water splitting has not been studied.  The present research deals with such a systematic study on a coupled ZnO/TiO2 system.  Ordered mesoporous coupled TiO2/ZnO materials were synthesized using Pluronic P123 (P123) as the surfactant, titanium butoxide and ZnCl2 precursors.

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 ZnO-TiO2 photocatalyst was dispersed in 3.5 mL of H2O and 0.5 mL methanol or 10 mg biomass as sacrificial agents.  A 300 W xenon lamp (Oriel) equipped with a UV-filter (λ = 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  From 3 mL overhead, 0.1 mL of gaseous samples were withdrawn periodically and injected into the gas chromatograph (GC), from which photocatalytic activity for hydrogen evolution was evaluated.  

XRD, UV-Vis spectra, SEM/TEM and N2 adsorption-desorption isotherm analysis of coupled ZnO/TiO2 composites and H2 generation from photocatalytic water-splitting reaction will be presented.

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