Influence of nickel in the hydrogen production activity of TiO sub(2)
Sol-gel synthesised TiO sub(2) developed by our group was modified through the addition of nickel nitrate and ammonium carbonate in the synthesis process. Photocatalysts were synthesised with different Ni/Ti molar ratios (0.015,0.030, 0.045) and constant Ni/N ratio equal to 1.5 and subjected to post...
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Published in | Applied catalysis. B, Environmental Vol. 152-153; pp. 192 - 201 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
25.06.2014
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Subjects | |
Online Access | Get full text |
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Summary: | Sol-gel synthesised TiO sub(2) developed by our group was modified through the addition of nickel nitrate and ammonium carbonate in the synthesis process. Photocatalysts were synthesised with different Ni/Ti molar ratios (0.015,0.030, 0.045) and constant Ni/N ratio equal to 1.5 and subjected to post-calcination at temperatures of between 400 C and 700 C. Characterisation was carried out with: X-ray diffraction (XRD), UV-vis diffusive reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy-energy dispersive X-ray analysis (TEM-EDX), thermal analysis (TGA, DTA), aggregate size distribution, Fourier transform infrared spectroscopy (FTIR) and nitrogen adsorptiondesorption isotherm (BET). Photoactivity in terms of photocatalytic hydrogen production was tested using a suspension of photocatalyst at 25 vol.% methanol. With a continuous flow of N sub(2) in headspace the hydrogen produced was conducted to a gas chromatograph for quantification. No evidence of the presence of N was found in the photocatalyst. However, the presence of Ni enhanced TiO sub(2) photoactivity, with a calcination temperature of 550 C resulting in the highest photoactivity value of 260.76 [mu]umolh super(-1). |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0926-3373 |
DOI: | 10.1016/j.apcatb.2014.01.039 |