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Carbon nanoonions are novel carbon nanoestructures that have potential applications in fields like electronics and chemical catalysis. Here is reported a very simple but effective method of purifying carbon nanoonions produced by submerged arc discharge in water based on the liquid water – toluene liquid-liquid extraction. Purified and non-purified samples were characterized by atomic force microscopy, high resolution transmission electronic microscopy and Brunauer-Emmett-Teller gas adsorption isotherms method. Microscopy results showed a good purification and allowed the assessment of the particles diameter distribution. Specific surface area  was measured showing a great increment from (14.7 ± 0.3) m2×g-1 for the non-purified sample (14.7 ± 0.3) m2×g-1 for the non-purified sample to (170 ± 3) m2×g-1for the purified sample. Average particles diameter was also assessed from the adsorption isotherms; diameter values obtained by the three techniques were in good agreement being between 20 to 30 nm.