Comparison of Hydrogen Production Efficiency by Rhodopseudomonas palustris MP3 and Rhodopseudomonas harwoodiae SP6 Using an Iron Complex as an Enhancement Factor

Fariha Kanwal, Arifa Tahir, Takuya Tsuzuki, David Nisbet, Junhong Chen and Angel A. J. Torriero ()
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Fariha Kanwal: Environmental Science Department, Lahore College for Women University, Lahore 42000, Pakistan
Arifa Tahir: Environmental Science Department, Lahore College for Women University, Lahore 42000, Pakistan
Takuya Tsuzuki: School of Engineering, Australian National University, Canberra, ACT 2601, Australia
David Nisbet: The Graeme Clark Institute, The University of Melbourne, Melbourne, VIC 3010, Australia
Junhong Chen: Geoscience Australia, Canberra, ACT 2601, Australia
Angel A. J. Torriero: School of Life and Environmental Sciences, Faculty of Science Engineering & Built Environment, Deakin University, Burwood, VIC 3125, Australia

Energies, 2023, vol. 16, issue 13, 1-10

Abstract: In the present study, an iron(II)-nanoscale organic complex (Fe-NO) was used as an enhancement factor by two different Rhodopseudomonas species of purple non-sulphur bacteria (PNSB) to produce hydrogen (H 2 ). The Fe-NO complex was synthesised using FeSO 4 ·7H 2 O and Eucalyptus viminalis —a native Australian plant leaf extract—in a 1:2 and 2:1 concentration ratio. Besides, FeSO 4 ·7H 2 O was also used as a source of iron(II) for comparison with the Fe-NO complex. The photo-fermentative bacterial cultures were isolated from a fishpond, and only two strains, MP3 and SP6, were found viable after several attempts of quadrate streaking. After phylogenetic analysis, these strains were designated as R. palustris MP3 and R. harwoodiae SP6. After comparison with the control, the results showed that the PNSBs manifested an approximately 50% higher H 2 yield when the 1:2 Fe-NO complex was used in the fermentation broth at 10 mg/L concentration, where 10.7 ± 0.54 and 10.0 ± 0.49 mL H 2 /L were obtained by R. palustris MP3 and R. harwoodiae SP6, respectively. The study revealed that the 1:2 Fe-NO complex could be an important material for efficient H 2 production.

Keywords: photo-fermentative bacteria; phyto-fabricated NO-Fe complex; Rhodopseudomonas palustris MP3; Rhodopseudomonas harwoodiae SP6 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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