New Insight on Carbon Dioxide-Mediated Hydrogen Production** |
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| Authors: | Prof. Dr. Antoni W. Morawski Dr. Ewelina Kusiak-Nejman Dr. Iwona Pełech Katarzyna Ćmielewska Dr. Daniel Sibera Piotr Staciwa Dr. Agnieszka Wanag Marcin Gano Dr. Ewa Ekiert Dr. Joanna Kapica-Kozar Kordian Witkowski Prof. Dr. Urszula Narkiewicz |
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| Affiliation: | 1. Department of Chemical Inorganic Technology and Environment Engineering Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland;2. Department of General Civil Engineering Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, Piastów Ave., 50a, 70-311 Szczecin, Poland;3. Department of Chemical Organic Technology and Polymeric Materials Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Piastów Ave., 42, 71-065 Szczecin, Poland |
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| Abstract: | A new approach to hydrogen production from water is described. This simple method is based on carbon dioxide-mediated water decomposition under UV radiation. The water contained dissolved sodium hydroxide, and the solution was saturated with gaseous carbon dioxide. During saturation, the pH decreased from about 11.5 to 7–8. The formed bicarbonate and carbonate ions acted as scavengers for hydroxyl radicals, preventing the recombination of hydroxyl and hydrogen radicals and prioritizing hydrogen gas formation. In the presented method, not yet reported in the literature, hydrogen production is combined with carbon dioxide. For the best system with alkaline water (0.2 m NaOH) saturated with CO2 under UV-C, the hydrogen production amounted to 0.6 μmol h−1 during 24 h of radiation. |
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| Keywords: | carbon dioxide fixation carbon storage hydrogen photochemistry photolysis |
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