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 |
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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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