Development of Cu/Ti02 Photocatalyst for Hydrogen Production under Visible Light
Technologies for generating hydrogen from water usmg modified photocatalyst have drawn many attentions. In this study the photocatalysis for hydrogen generation were synthesized us1ng two methods; complex-precipitation and wet impregnation method. Cu/Ti02 with 2, 5, I 0 and 15 wt% loading was pre...
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Format: | Thesis |
Language: | English |
Published: |
2009
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Online Access: | http://utpedia.utp.edu.my/8747/1/2009%20-%20Development%20Of%20CuTiO2%20Photocatalyst%20For%20Hydrogen%20Production%20Under%20Visible%20Light.pdf http://utpedia.utp.edu.my/8747/ |
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Summary: | Technologies for generating hydrogen from water usmg modified photocatalyst have
drawn many attentions. In this study the photocatalysis for hydrogen generation were
synthesized us1ng two methods; complex-precipitation and wet impregnation
method. Cu/Ti02 with 2, 5, I 0 and 15 wt% loading was prepared, dried and prior to
calcination, thermal gravimetric analysis was carried out to determine their thermal
stability. Based on the thermograms, the calcination temperature was estimated to be
300°C or higher. Therefore, the photocatalysis were calcined at 300°C, 400°C and 500°C
for 30 min. The effect of transition metal loading and calcination temperatures on the
photocatalytic activity was investigated. Photocatalytic activity was carried out under
visible light illumination (500 W halogen lamp as the light source). The screening
process is used to monitor the photocatalytic activities for hydrogen production in a
multipart reactor containing of photocatalyst, water and methanol (as scavenger). For all
photocatalysis, the highest amount of hydrogen produced was 8.5 mLg-1h-1 for Cu/Ti02
calcined at 300°C C for 30 min prepared using complex-precipitation method. The
amount of hydrogen produced decrease as the calcination temperature increases for all
the catalysts. The photocatalysis were also characterized using Temperature Programmed
Reduction (TPR), Diffuse Reflectance UV-Yis (DR-UV-Vis), Field Emission Scanning
Electron Microscope (FE-SEM), Fourier Transform lnfared (FTIR), X-ray Difractometer
(XRD) and surface area determination (BET). The results from TPR and XRD indicated
that the only Cu species present was CuO supported on Ti02. The SEM micrographs
showed morphology of the prepared samples with particle size around 20 nm to I 00 nm.
The effect of transition metal loading was studied and found that incorporating with
copper enhance the photocatalytic activity compared to Ti02. However higher
concentration of transition metal loading up to 15 wt% led to the decrement of the
photocatalytic activity. The lower photocatalytic activity can be influence by the surface
saturation of Cu which minimized the light penetration from reaching to the surface of
the Ti02. The incorporation of Cu transition metal had successfully shifted the Ti02
band gap to a longer wavelength as evidence by DR-UV-Vis.
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