Study on pyrolysis regeneration of activated carbon for Tributyl phosphate decolorization
The effect of regeneration temperature,regeneration time,and regeneration frequency on the regeneration effi-ciency of waste activated carbon(WAC)was studied by high-temperature pyrolysis method,using methylene blue adsorp-tion amount and iodine value as evaluation indicators,using powdered activated carbon(WAC)decolorized with tributyl phosphate(TBP)as the materials.The experimental results showed that the optimal regeneration condition of activated car-bon was 500℃for 90 min.After the fourth regeneration,the adsorption properties of 82%methylene blue and 67%iodine could be recovered.The weight loss,heat absorption and heat release of activated carbon during pyrolysis were analyzed by TG-DSC,and the activated carbon before and after regeneration were characterized by the specific surface area and aper-ture analyzer,FT-IR,SEM and other testing methods to verify its regeneration effect.This research gave a comprehensive analysis of the pyrolysis mechanism of spent activated carbon,which provided theoretical guidance for the pyrolysis regen-eration of decolorized activated carbon from TBP in a wet phosphoric acid purification process.
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万方数据
维普
