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Effect of silica-core gold-shell nanoparticles on the kinetics of biohydrogen production and pollutant hydrogenation via organic acid photofermentation over enhanced near-infrared illumination.

Author
Abstract
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A biological photoinduced fermentation process provides an alternative to traditional hydrogen productions. In this study, biohydrogen production was investigated at near IR region coupled to a near-field enhancement by silica-core gold-shell nanoparticles (NPs) over a range of acetate concentrations (5-40 mM) and light intensities (11-160 W/m). The kinetic data were modeled using modified Monod equations containing light intensity effects. The yields of H and CO produced per acetate were determined as 2.31 mol-H/mol-Ac and 0.83 mol-CO/mol-Ac and increased to 4.38 mmol-H/mmol-Ma and 2.62 mmol-CO/mmol-Ma when malate was used. Maximum increases in H and CO productions by 115% and 113% were observed by adding NPs without affecting the bacterial growth rates (6.1-8.2 mg-DCM/L/hour) while the highest hydrogen production rate was determined as 0.81 mmol/L/hour. Model simulations showed that the energy conversion efficiency increased with NPs concentration but decreased with the intensity. Complete hydrogenation application was demonstrated with toxic 2-chlorobiphenyl using Pd catalysts.

Year of Publication
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2021
Journal
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International journal of hydrogen energy
Volume
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46
Issue
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11
Number of Pages
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7821-7835
Date Published
:
2021
ISSN Number
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0360-3199
DOI
:
10.1016/j.ijhydene.2020.11.257
Short Title
:
Int J Hydrogen Energy
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