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This study evaluates the use of cork granulates as sorbents of oil and grease (O&G) in mineral oil-in-water emulsions. Regranulated cork granules showed faster kinetics and higher sorption capacities than raw cork granules for mineral oil; this can be associated to the increase of carbon content due to the thermal treatment (350-400oC), leading to the extraction of phenolic compounds and increment of the surface hydrophobicity. Sorption kinetic studies indicated that oil sorption onto the surface of regranulated cork is favoured in acidic conditions. A partition/linear model was able to describe well the equilibrium data, achieving organic-carbonnormalized partition coefficients between (pH = 6.0) 3.3 < log KOC < 4.1 (pH = 2.0). The maximum regranulated cork experimental sorption capacity at pH 4.0 was 270 mg g -1 considering an initial oil concentration of 110 mg L -1 . A mass transfer model, considering equilibrium given by a linear model, film diffusion resistance and instantaneous surface equilibrium was able to predict adequately the kinetic data.

CORK BYPRODUCTS AS SORBENTS OF MINERAL OIL IN OIL-IN-WATER EMULSIONS