108 / 2023-07-20 15:12:24

Fabricating the recyclable magnetic photo-nanocatalyst and its application on biohydrogen production

magnetic nanoparticles,TbFeO3,Bio-H2

The optimistic impact of orthoferrite nanoparticles (NPs) on photo fermentation for biohydrogen production have been increased, and the mechanism still requires to be investigated more. Low hydrogen (H₂) yield often occurs, being mainly due to H₂ generation pathway shift. In present study, Terbium-iron oxide nanoparticles (TbFeO₃ NPs) were synthesized to investigate their impacts on bioH₂ production. The highest H₂ yield of 319.34 mL/g glucose was found at 100 mg/L of TbFeO₃, being 47.6% higher than that from the control (225.84 mL/g glucose). The relative abundance of PNSB increased from 54.2% to 66.43%. The large specific surface area of TbFeO₃ provided appropriate sites for the colonization of PNSB and enhanced the bacterial approach to nutrients. Additionally, the Tb³⁺ gradually released from TbFeO₃ NPs raised microbial transmembrane transport capacity, promoting glycolytic efficacy and Fe availability, though improving hydrogenase content, and shifting the bioH₂ evolution to butyrate pathway for more H₂. This provides the novelty for biochemical utilization of Tb and new insights into the improved H₂ yield amended with TbFeO₃.