Abstract
Low hydrogen (H2) yield via dark fermentation often occurs, being mainly due to H2 generation pathway shift. In this study, lanthanum-iron oxide nanoparticles (LaFeO3 NPs) were prepared to investigate their effects on bioH2 production. The highest H2 yield of 289.8 mL/g glucose was found at 100 mg/L of LaFeO3, being 47.6% higher than that from the control (196.3 mL/g glucose). The relative abundance of Firmicutes increased from 54.2% to 67.5%. The large specific surface area of LaFeO3 provided sufficient sites for the colonization of Firmicutes and increased the bacterial access to nutrients. Additionally, the La3+ gradually released from LaFeO3 NPs raised microbial transmembrane transport capacity, promoting glycolytic efficiency and Fe availability, thereby increasing hydrogenase content, and shifting the bioH2 evolution to butyrate pathway for more H2. This provides the novelty for biochemical utilization of La and new insights into the improved H2 yield amended with LaFeO3.
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