Abstract
Graphene aerogel (GA) is widely studied in the oil contamination field today due its excellent adsorption properties like superhydrophobicity, high surface area, light-weight and high reusability. This study presents the effects of oil viscosity, agitation speed and oil-sand wettability on the adsorption efficiency of heavy crude oil from contaminated sand using GA. Results showed that the adsorption kinetics were best fitted with the Langmuir isotherm and pseudo-second order kinetic model indicating that the adsorption system was a two-stage process, and a monolayer adsorption route. The fitted pseudo-second order kinetic model showed that the adsorption equilibrium decreased from 12354mg/g to 6180mg/g with increased in crude oil viscosity from 80cst to 380cst, at oil-sand of wettability 4% (wt.), agitation speed of 50rpm and room temperature of 27°C. In addition, the highest adsorption capacity was experimentally found to occur at 4% (wt.) oil-sand wettability and agitation speed of 70rpm, with an oil (180cst) adsorption capacity of 11736mg/g. On the other hand, Thus, this study showed that the GA is a promising material to improve the traditional batch extraction to remove and recover heavy crude oil from oil-wet sands.
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