Coconut Coir Activated Carbon: An Adsorbent
For Removal Of Lead From Aqueous Solution
Author(s)
M. Chaudhuri & S. N. B. Saminal
Abstract
The purpose of this study was to prepare activated carbon from an agricultural
solid waste and assess its effectiveness in adsorptive removal of lead from
aqueous solution. Activated carbon was prepared from coconut coir and its
characteristics were compared with that of a commercial bituminous coal-based
activated carbon. The coconut coir activated carbon possessed higher surface and
micropore areas, micropore volume and average pore diameter, and well
developed meso- and micropores. Adsorption of lead from aqueous solution by
the coconut coir activated carbon was examined. Batch adsorption test showed
that extent of adsorption was dependent on lead concentration, contact time, pH
and activated carbon dose. Adsorption was low at acidic pH and increased up to
pH 5, with marginal increase up to pH 6. Equilibrium adsorption was attained in
2.5 h. Lead adsorption followed pseudo-second order kinetics. Equilibrium lead
adsorption data for the coconut coir activated carbon and commercial activated
carbon were described by the Langmuir and Freundlich isotherm models.
Coconut coir activated carbon showed higher lead adsorption capacity [7.75
(Langmuir) and 3.63 (Freundlich)] compared with the commercial activated
carbon [7.55 (Langmuir) and 1.87 (Freundlich)]. Coconut coir activated carbon
is a suitable substitute for commercial activated carbon in the adsorptive removal
of lead from water.
Keywords: adsorption, activated carbon, coconut coir, heavy metal, lead.
Keywords
adsorption, activated carbon, coconut coir, heavy metal, lead
Related Book
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