FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Activated carbon, kinetic model, corncob, crude oil, textural properties
Activated corncob carbon was prepared and tested for removal of crude oil, diesel, kerosine and petrol from land and aqueous medium by comparing its oil uptake, recovery of sorbed oil and retain ability of sorbed oil with a standard; conventional synthetic sorbent used in oil spill removal. The experiment was conducted under the same experimental condition by batch adsorption method. The result of the study shows that the standard sorbed 11.50 g/g of crude oil, 10.38 g/g of diesel, 8.20 g/g of kerosine and 6.30 g/g of petrol while activated corn cob carbon sorbed 4.15 g/g of crude oil, 3.27 g/g of diesel, and 2.66 g/g of kerosine and 2.40 g/g of petrol. The standard performed better in terms of oil uptake and recovery, while activated corncob carbon retained more of the sorbed. Activated corncob carbon is suitable where oil recovery is not required. Textural properties and functional group studies shows that the standard has larger surface area (1633 m2 g) than activated corncob carbon (784 m2 g), it is mesoporous and predominantly hydrocarbon, while, activated corncob carbon is microporous and has surface acidic groups. The difference in porosity, surface chemistry and functional group present in the sorbents contributed to higher uptake by the standard. The volume of water sorbed together with each sorbate onto activated corncob carbon and the standard was 3 ml (0.70 g) and 6 ml (1.2 g), respectively. These volumes are minimal for each of the sorbent, indicating that activated corncob carbon can be employed in oil spill mop in aqueous environment. Langmuir isotherm model can describe the adsorption process of crude oil and it’s lower onto activated corncob carbon and standard. Kinetic models employed suggest that the sorption process of the sorbates onto activated corncob carbon and the standard occurs via a surface reaction and intraparticle diffusion mechanism. The result of the study indicates that activated corncob carbon is a viable oil spill sorbent.
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