Investigation of the potential effect of encapsulated metal nanoparticles on enhancement of thermophilic anaerobic digestion.

Al-Ahmad, Alaa E.; Lambert, Stéphane B.; Mahy, Julien G. ORCID: https://orcid.org/0000-0003-2281-9626; Heinrichs, Benoît; Wannoussa, Wissal; Tasseroul, Ludvine; Weekers, Frédéric; Thomart, Philippe et Hiligsmann, Serge (2023). Investigation of the potential effect of encapsulated metal nanoparticles on enhancement of thermophilic anaerobic digestion. AIMS Environmental Science , vol. 10 , nº 6. pp. 764-793. DOI: 10.3934/environsci.2023042.

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The present work investigates the enhancement effect of seven different catalysts made of Cu/SiO2, Pd/SiO2, Pt/SiO2, Ni/SiO2, Co/SiO2, Ag/SiO2 and Fe/SiO2 nanoparticles (NPs) on methane production during thermophilic anaerobic digestion. The tested NPs were synthesized by the sol-gel process and encapsulated in porous silica (SiO2) to prevent their coagulation and agglomeration. Transmission electron microscopy (TEM) pictures confirmed the specific morphologies of all seven catalysts. Then, these 7 NPs were tested first in batch experiments with acetate as a carbon substrate for bio-methane production. Ni/SiO2 and Co/SiO2 showed the best enhancement of methane production from acetate. From this part, both NPs were tested for bio-methane production on two different substrates: starch and glucose. With the starch substrate, the improvements of methane production were equal to 47% and 22%, respectively, for Ni- and Co/SiO2 compared to control sample. In the last part of this work, the influences of NP concentration and thermal pre-treatment applied to the NPs on bio-methane production from glucose were investigated. The results showed that all forms of nickel and cobalt NPs enhance the methane production, and their effect increased with the increase of their concentrations. The best sample was the calcined nickel NPs at a concentration of 10–4 mol L–1, leading to a methane production rate of 72.5% compared to the control.

Type de document:	Article
Mots-clés libres:	anaerobic digestion; heavy metal; hydrogen; methane production; nanoparticles; sol-gel process
Centre:	Centre Eau Terre Environnement
Date de dépôt:	06 févr. 2024 21:17
Dernière modification:	06 févr. 2024 21:17
URI:	https://espace.inrs.ca/id/eprint/14191

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