title: Photocatalytic hydrogen production by water/methanol decomposition using Au/TiO2 prepared by deposition-precipitation with urea.
abstract: Gold nanoparticles deposited on TiO2 Degussa P25, prepared by deposition-precipitation with urea, were studied in the photocatalytic hydrogen production. The effect of parameters such as mass of catalyst, gold loading, thermal treatment, and atmosphere of treatment was evaluated and optimized. The presence of metallic gold on the titania surface showed to have contributed to the high improvement in the activity of bare TiO2 for hydrogen generation under UV light (λ=254 nm) using a lamp of low energy (2W) consumption. The optimal gold loading for the photocatalysts was 0.5 wt.%, the mass of catalyst in the reactor was 0.5 g/L in a water/methanol 1:1 vol. solution, and the thermal treatment that produced the most active gold nanoparticles was found at 300°C. The photocatalysts thermally treated under hydrogen at 300°C produced 1492 μmol g(-1)h(-1) of hydrogen; the same catalyst activated in air produced 1866 μmo lg(-1)h(-1) of hydrogen.
authors.affiliation: Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, A.P. 70-186, C.P. 04510 México D.F., Mexico. Electronic address: coco.oros@yahoo.com.
authors.forename: Socorro
authors.initials: S
authors.lastname: Oros-Ruiz
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Zanella
authors.forename: Rosendo
authors.initials: R
authors.lastname: López
authors.forename: Agileo
authors.initials: A
authors.lastname: Hernández-Gordillo
authors.forename: Ricardo
authors.initials: R
authors.lastname: Gómez
mesh_terms: D006046:Gold / Q000737:chemistry / Q000528:radiation effects*; D006859:Hydrogen / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry / Q000528:radiation effects*; D000432:Methanol / Q000737:chemistry*; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry / Q000528:radiation effects*; D014466:Ultraviolet Rays; D014508:Urea / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; C009495:titanium dioxide; D006046:Gold; D006859:Hydrogen; D014508:Urea; D014025:Titanium; D000432:Methanol
keywords: Gold nanoparticles; Hydrogen production; Photocatalysis; Water splitting