Study on the Condition of Preparation of Magnet Activated Carbon by Pyrolytic Process

A novel method for preparing magnetic activated carbon (MAC) has been investigated in this paper. The MAC was prepared by the follow routes: it was impregnated with a ferric chloride solution in pH=9 which adjusted by ammonia. The precursor of activated carbon loaded the iron hydroxide was prepared by the impregnation-basified method and sealed the sample with charcoal powder. The MAC was prepared by high temperature atmospheric pressure reduction roasting. The results showed that the MAC which was prepared by pyrolytic process of ammonia precipitation and at 600°C under atmospheric pressure for roasting 3-4 hours, the Fe(II)/Fe(III) molar ratio was 0.506 , the MAC accounts for 82.1% of total activated carbon and the ferric ion in MAC was 5.3% . The similar effect of pure activated carbon was observed in acid fuchsin solution test with MAC for decolorization. It subsidented quickly and separated completely under the guidance of magnetic field.