A commercial exfoliated graphite was used for checking its sorption capabilities for removing engine oil and dyes from wastewater. Slight oxidation of exfoliated graphite in the air at 400℃ was found to be effective to improve adsorption capacity for dyes, methylene blue and methyl orange. However, its treatment in HNO_3 reduced all capacities for engine oil and dyes. A possibility for simultaneous removal of oil and dyes dispersed in wasted water was revealed.
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