Authors : Bedmohata M.A#, Chaudhari A.R.1 , Singh S.P.2, Chaudhari M.D.
Page Nos : 74-82
Description :
Lignin is a waste which is generally used only for its fuel value; therefore it can be of
interest to prepare a higher value product such as activated carbon. Activated carbon
can be obtained through chemical activation of industrial waste lignin by using various
activating agents such as H3PO4, K2CO3, ZnCl2, KOH , Na2CO3 etc. Lignin is a waste
which is generally used only for its fuel value, therefore it can be of interest to prepare a
higher value product such as an activated carbon from lignin. Activated carbon is a
high-porosity material which is useful in adsorption of both gases and solute from
aqueous solution. Under appropriate condition of activation it is possible to obtain
materials with surface area and pore volume approaching 2000 m2 /g and 1 cm3/ g
respectively and these material have capacities for aqueous phase adsorption of metallic
pollutants that are comparable to those of commercial activated carbon. To optimize the
preparation method, the effect of the main process parameters such as impregnation
ratio, activation temperature and activation time were investigated. The present review
compiles the work done over the last few decades on the use of lignin for the
preparation of activated carbon. As there is lots of problem of utilization of industrial
waste lignin which is generated as a by-products in the process of conversion of wood
chips to pulp in manufacturing of paper, the development of methods to re-use waste
materials is greatly desired and the production of activated carbons from wastes is an
interesting possibilities. Relatively little work has so far been published and there is
considerable scope for more detailed studies on the preparation, characterization and
adsorption application of lignin-based activated carbons. Moreover the review also
examines the surface chemicals properties of lignin based activated carbons.
