Efficient photocatalytic hydrogen generation by silica supported and platinum promoted titanium dioxide

Journal Article · Sun Sep 01 04:00:00 EDT 2013 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2013.05.057· OSTI ID:22341797

Joshi, Meenal M.; Labhsetwar, Nitin K. ^[1]; Parwate, D. V. ^[2]

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1. Environmental Materials Division, National Environmental Engineering Research Institute (NEERI, C.S.I.R.), Nagpur 440020 (India)
2. Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440010 (India)

Graphical abstract: Titanium dioxide was supported on mesoporous silica and promoted with Pt and Ru. The supported photocatalysts show high surface area and better photocatalytic activity in visible light as compared to the benchmark Degussa P25. These photocatalysts were characterized using XRD, BET-SA, and UV-DRS techniques. The surface area of supported photocatalyst was 140.6 m{sup 2}/g which is higher than Degussa P-25. Supported photocatalyst was evaluated for hydrogen evolution via water splitting reaction using ethanol as a sacrificial donor. Hydrogen yield observed is 4791.43 μmol/h/g of TiO{sub 2} and that for P-25 is 161 μmol/h/g of TiO{sub 2} under visible light irradiation. The value is 30 times higher than benchmark material Degussa P-25. This photocatalyst is also found stable up to 24 h without replenishing with sacrificial donor ethanol. - Highlights: • Semiconductor titanium dioxide has been supported on silica gel and promoted with Pt by simple wet impregnation route. • This synthesized photocatalyst is showing high surface area of 140.6 m{sup 2}/g with crystallite size in the range of 15.44 Å. • This photocatalyst is showing enhanced hydrogen yield of about 4791.43 μmol/h/g of TiO{sub 2}. • This photocatalyst is also found stable up to 24 h without replenishing with sacrificial donor ethanol. • The effect of various operating parameters on supported photocatalyst also has been studied. - Abstract: Titanium dioxide was supported on mesoporous silica and promoted with Pt and Ru. The supported photocatalysts show high surface area and better photocatalytic activity in visible light as compared to the benchmark Degussa P25. These photocatalysts were characterized using XRD, BET-SA, and UV-DRS techniques. The surface area of supported photocatalyst was 140.6 m{sup 2}/g which is higher than Degussa P-25. Supported photocatalyst was evaluated for hydrogen evolution via water splitting reaction using ethanol as a sacrificial donor. Hydrogen yield observed is 4791.43 μmol/h/g of TiO{sub 2} and that for P-25 is 161 μmol/h/g of TiO{sub 2} under visible light irradiation. The value is 30 times higher than benchmark material Degussa P-25. This photocatalyst is also found stable up to 24 h without replenishing with sacrificial donor ethanol. However silica gel/TiO{sub 2}/Ru does not show any exciting result for hydrogen generation. The effect of various operating parameters like photocatalyst loading, Illumination time and intensity of light on supported photocatalyst also has been studied.

• OSTI ID: 22341797
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 9 Vol. 48; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ETHANOL
HYDROGEN
INTERSTITIAL HYDROGEN GENERATION
IRRADIATION
NANOSTRUCTURES
PHOTOCATALYSIS
PLATINUM
SILICA
SILICA GEL
SOL-GEL PROCESS
TITANIUM OXIDES
X-RAY DIFFRACTION