Phytosynthesized iron oxide nanoparticles and ferrous iron on fermentative hydrogen production using Enterobacter cloacae: Evaluation and comparison of the effects

Investigating the effects of iron and nickel nanoparticles on dark hydrogen fermentation from starch using central composite design

“…They obtained the maximum yield of 316.1 mL/g-VS at glucose concentration of 14.01 g/L, initial pH 5.61, and Ni 0 NPs concentration of 5.67 mg/ L [16]. Mohanraj et al [17] compared the impacts of iron oxide NPs and iron sulfate on the efficiency of dark hydrogen fermentation from glucose using Enterobacter cloacae. They observed that the supplementation of iron oxide NPs, at the concentration of 125 mg/L, led to the maximum hydrogen yield of 257.6 mL/g-VS, while supplementation of iron sulfate at their optimum concentration (25 mg/L) led to the hydrogen yield of 211.6 mL/g-VS. To the best of our knowledge, no study has ever investigated the effect of nickel and iron NPs on the efficiency of the dark fermentation of starch for biohydrogen production.…”

Enhanced dark fermentative hydrogen production by zero-valent iron activated carbon micro-electrolysis

“…In addition, the researchers have suggested that when the ambient temperature is relatively lower, bacteria need more ferrous ion to activate the hydrogenase enzyme, so that it can oxidize reduced ferredoxin for better production of molecular hydrogen [15]. Recently, metal oxide (Fe x O y ) nanoparticle has been applied to enhance fermentative hydrogen production due to its affinity for electrons and high reactivity [16,17]. However, it also faces a critical issue that hinders its application.…”

Upgrading continuous H2gas recovery from rice straw hydrolysate via fermentation process amended with magnetite nanoparticles

“…The reasons behind higher H 2 productivity associated with MNP‐loaded ABR could be explained by the dissolution of Fe 3 O 4 magnetic NPs via dissimilatory iron reduction reactions into metallic ions with proper distribution inside the reactor . Released Fe 2+ and Fe 3+ ions participated in the stimulation of hydrogenase enzyme ( hyd ) activity, whereas [Fe‐Fe] hyd and [Fe‐Ni] hyd contain metallic active sites . In addition, Wang et al discovered that sludge conductivity was catalyzed by MNP amendment to a maximum value of 2.17 times higher than control reactor.…”