Removal of edta from aqueous solutions using activated carbon prepared from rubber wood sawdust: Kinetic and equilibrium modeling

  • Anoop Krishnan K
  • Sreejalakshmi K
  • Varghese S
 et al. 
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Adsorptive removal of EDTA (ethylenediaminetetraacetic acid) from
aqueous solution was studied using steam pyrolyzed activated carbon.
Rubber wood sawdust, obtained from a local timber facility at
Kodangavila, Trivandrum, Kerala, India was used as the precursor for the
production of the activated carbon. Batch adsorption experiments were
employed to monitor and optimize the removal process. The experimental
parameters, i.e., solution pH, agitation time, initial EDTA
concentration and adsorbent dosage, affecting the adsorption of EDTA
onto sawdust activated carbon (SDAC) were optimized. The inner core
mechanism for the interaction between EDTA and SDAC, which resulted in
the adsorption process, was also discussed. The change in amount of EDTA
adsorbed onto SDAC and CAC (commercial activated carbon) was compared
over a wide range of pH (2.0-8.0). The maximum removal of EDTA took
place in the pH range of 4.0-6.0 for SDAC and 5.0-5.5 for CAC, which
demonstrates the effectiveness of the former adsorbent. Kinetic as well
as equilibrium studies were performed to determine the rate constant and
adsorption capacity, respectively. The adsorption kinetic data was
fitted with pseudo-first-order kinetics and the equilibrium data was
shown to follow the Langmuir isotherm model. These observations explain
the formation of a monolayer of EDTA on the surface of SDAC as confirmed
by the slow approach to equilibrium after 4 h of contact time. The
adsorption capacity of SDAC for the removal of EDTA was 0.526 mmol/g and
is seen to be greater than that of CAC and other reported adsorbents
(0.193-0.439 mmol/g). Finally, it is clear that the production of steam
pyrolyzed activated carbon in the presence of K(2)CO(3) greatly enhanced
EDTA removal and resulted in a product with possible commercial value
for wastewater treatment strategies.

Author-supplied keywords

  • Adsorption
  • Chelating agent
  • Isotherm
  • Speciation
  • Wastewater treatment

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