Author, as appears in the article.: Imizcoz, Mikel; Puga, Alberto, V

Department: Enginyeria Química

e-ISSN: 2073-4344

URV's Author/s: Puga Vaca, Alberto

Keywords: Water Wastewaters Waste Solar Simultaneous degradation Rice husks Pt/tio2 suspensions Photocatalysis Nanoparticles Hydrogen Generation Evolution Ethanol Conversion Cellulose Biomass

Abstract: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. A systematic study on the solar photocatalytic hydrogen production (photoreforming) performance of M/TiO2 (M = Au, Ag, Cu or Pt) using glucose as a model substrate, and further extended to lignocellulose hydrolysates and wastewaters, is herein presented. Three metal (M) co-catalyst loading methods were tested. Variation of the type of metal results in significantly dissimilar H2 production rates, albeit the loading method exerts an even greater effect in most cases. Deposition-precipitation (followed by hydrogenation) or photodeposition provided better results than classical impregnation (followed by calcination). Interestingly, copper as a co-catalyst performed satisfactorily as compared to Au, and slightly below Pt, thus representing a realistic inexpensive alternative to noble metals. Hydrolysates of either α-cellulose or rice husks, obtained under mild conditions (short thermal cycles at 160◦ C), were rich in saccharides and thus suitable as feedstocks. Nonetheless, the presence of inhibiting byproducts hindered H2 production. A novel photocatalytic UV pre-treatment method was successful to initially remove the most recalcitrant portion of these minor products along with H2 production (17 µmol gcat−1 h−1 on Cu/TiO2). After a short UV step, simulated sunlight photoreforming was orders of magnitude more efficient than without the pre-treatment. Hydrogen production was also directly tested on two different wastewater streams, that is, a municipal influent and samples from operations in a fruit juice producing plant, with remarkable results obtained for the latter (up to 115 µmol gcat−1 h−1 using Au/TiO2).

Thematic Areas: Química Physical and theoretical chemistry Farmacia Environmental science (all) Engenharias ii Ciências biológicas ii Chemistry, physical Catalysis Astronomia / física

licence for use: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 20734344

Author's mail: alberto.puga@urv.cat

Author identifier: 0000-0003-4201-2635

Record's date: 2023-02-18

Journal volume: 9

Papper version: info:eu-repo/semantics/publishedVersion

Link to the original source: https://www.mdpi.com/2073-4344/9/7/584

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Catalysts. 9 (7):

APA: Imizcoz, Mikel; Puga, Alberto, V (2019). Assessment of Photocatalytic Hydrogen Production from Biomass or Wastewaters Depending on the Metal Co-Catalyst and Its Deposition Method on TiO2. Catalysts, 9(7), -. DOI: 10.3390/catal9070584

Article's DOI: 10.3390/catal9070584

Entity: Universitat Rovira i Virgili

Journal publication year: 2019

First page: 584

Publication Type: Journal Publications