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Assessment of photocatalytic hydrogen production from biomass or wastewaters depending on the metal co-catalyst and its deposition method on TiO2

AuthorsImizcoz, Mikel; Puga, Alberto V.
Issue Date3-Jul-2019
PublisherMultidisciplinary Digital Publishing Institute
Molecular Diversity Preservation International
CitationCatalysts 9(7): 584 (2019)
AbstractA systematic study on the solar photocatalytic hydrogen production (photoreforming) performance of M/TiO (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 H 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 H production. A novel photocatalytic UV pre-treatment method was successful to initially remove the most recalcitrant portion of these minor products along with H production (17 µmol g h on Cu/TiO). 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 g h using Au/TiO).
Publisher version (URL)http://dx.doi.org/10.3390/catal9070584
Identifiersdoi: 10.3390/catal9070584
issn: 2073-4344
Appears in Collections:(ITQ) Artículos
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