Activated Carbon is a non-graphite form of carbon which could
be produced from any carbonaceous material such as coal, lignite,
wood, paddy husk, coir pith, coconut shell, etc. Activated carbon
manufactured from coconut shell is considered superior to those
obtained from other sources mainly because of small macropores
structure which renders it more effective for the adsorption of
gas/vapour and for the removal of colour and odour of compounds.
The activated carbon is extensively used in the refining and
bleaching of vegetable oils and chemical solutions, water
purification, recovery of solvents and other vapours, recovery of
gold, in gas masks for protection against toxic gases, in filters
for providing adequate protection against war gases/nuclear fall
outs, etc. Steam activation and chemical activation are the two
commonly used processes for the manufacture of activated carbon.