STUDY ON THE TECHNOLOGY OF MANUFACTURING GRANULAR ACTIVATED CARBON FROM SAWDUST FOR DECOLORIZATION OF LIQUID

Granular activated carbon for decolorization of liquid was made from sawdust by activation with H3PO4. The properties of the prepared product were as follows:methylene blue 155-170 mL/g; decolorization of caramel A ≥ 100%; ash ≤4%; abrasive resistance ≥ 95%; and the rate of mesopore 50%-65%. Moreover, the modeling mechanism during the preparing process was emphatically discussed to reach the following conclusion: the key point for improving abrasive resistance of granular activated carbon is to chose the suitable conditions of kneading and heat treatment. The product can be applied to the decolorization and refining of fermentation liquid in food and medicine industries.