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Adsorptive desulphurization of model oil by Ag nanoparticles-modified activated carbon prepared from brewer’s spent grains

Olajire, A. A. and Abidemi, J. J. and Lateef, A. and Benson, N. U. (2017) Adsorptive desulphurization of model oil by Ag nanoparticles-modified activated carbon prepared from brewer’s spent grains. Journal of Environmental Chemical Engineering, 5. pp. 147-159.

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Abstract

This study reports removal of dibenzothiophene (DBT) from model oil (DBT dissolved in n-heptane) by silver nanoparticles modified activated carbon prepared from brewer’s spent grains using wet impregnation (WI) method. The removal efficiency follows the order AgNPscw=AC > AgNPskp=AC> ACB. The AgNPskp/AC and AgNPscw/AC exhibit higher adsorption capacities for DBT with maximum values of 25.7 and 29.8 mg DBT/gAds at 25 �C respectively, than ACB with 13.9 mg DBT/gAds. The two-fold enhancement in the DBT uptake capacities of modified ACs can be attributed to the introduction of Ag(1) ion, a weak Lewis acid as an additional adsorption site. A significant decrease from 212.9 to 136.2 m2/g in the Brunauer–Emmett–Teller surface area of AgNPscw/AC is observed following the loading of DBT. The equilibrium adsorption data is adequately represented by Freundlich isotherm. The adsorption kinetics of DBT by these adsorbents followed pseudo second-order (PSO) model and the mechanism of adsorption was controlled by film and intra-particle diffusion. The change in entropy and heat of adsorption for DBT adsorption by these adsorbents range from 0.18 to 0.19 kJ/mol K and 21.5 to 23.9 kJ/mol, respectively. The results indicate that Ag nanoparticles-modified ACs from brewer’s spent grains can be used as adsorbent for the removal of DBT from model oil.

Item Type: Article
Uncontrolled Keywords: Desulphurization Adsorption Ag nanoparticles Dibenzothiophene Activated carbon
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User: Mrs Patricia Nwokealisi
Date Deposited: 11 Apr 2017 12:53
Last Modified: 11 Apr 2017 12:53
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/8059

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