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• W4385480667 startingPage "11948" @default.
• W4385480667 abstract "Pd0 catalysis and microbially catalyzed reduction of nitrate (NO3–-N) were combined as a strategy to increase the kinetics of NO3– reduction and control selectivity to N2 gas versus ammonium (NH4+). Two H2-based membrane biofilm reactors (MBfRs) were tested in continuous mode: one with a biofilm alone (H2-MBfR) and the other with biogenic Pd0 nanoparticles (Pd0NPs) deposited in the biofilm (Pd–H2-MBfR). Solid-state characterizations of Pd0NPs in Pd–H2-MBfR documented that the Pd0NPs were uniformly located along the outer surfaces of the bacteria in the biofilm. Pd–H2-MBfR had a higher rate of NO3– reduction compared to H2-MBfR, especially when the influent NO3– concentration was high (28 mg-N/L versus 14 mg-N/L). Pd–H2-MBfR enriched denitrifiers of Dechloromonas, Azospira, Pseudomonas, and Stenotrophomonas in the microbial community and also increased abundances of genes affiliated with NO3–-N reductases, which reflected that the denitrifying bacteria could channel their respiratory electron flow to NO3– reduction to NO2–. N2 selectivity in Pd–H2-MBfR was regulated by the H2/NO3– flux ratio: 100% selectivity to N2 was achieved when the ratio was less than 1.3 e– equiv of H2/e– equiv N, while the selectivity toward NH4+ occurred with larger H2/NO3– flux ratios. Thus, the results with Pd–H2-MBfR revealed two advantages of it over the H2-MBfR: faster kinetics for NO3– removal and controllable selectivity toward N2 versus NH4+. By being able to regulate the H2/NO3– flux ratio, Pd–H2-MBfR has significant implications for improving the efficiency and effectiveness of the NO3– reduction processes, ultimately leading to more environmentally benign wastewater treatment." @default.
• W4385480667 created "2023-08-03" @default.
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• W4385480667 date "2023-08-02" @default.
• W4385480667 modified "2023-10-14" @default.
• W4385480667 title "Long-Term Continuous Test of H₂-Induced Denitrification Catalyzed by Palladium Nanoparticles in a Biofilm Matrix" @default.
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• W4385480667 doi "https://doi.org/10.1021/acs.est.3c01268" @default.
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• W4385480667 hasPublicationYear "2023" @default.
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