Publisher: Chemical Society of Nigeria

Adsorption Kinetics For The Removal of Lead (II) and Iron (II) Ions From Aqueous Solution Using Chemically Modified Palm Kernel Shell Carbon

J. A. Olunwa, C. I. Ekeocha, B. N. Okolue
KEYWORDS: chemisorption, chemically modified palm kernel shell carbon, sorption kinetics, isotherms, metal in solution.

ABSTRACT:

The  use  of  chemically  modified  palm  kernel  shell  carbon  in  the  absorption  of  metal  ions  from  an  aqueous  solution containing  lead  (II)  and  iron  (II)  ions  was  investigated.  During  this  study,  it  was  observed  that  increase  in  certain parameters  like  pH,  time,  temperature  and  concentration  of  the  system  influences  the  rate  of  absorption  of adsorbate  onto  adsorbent.  Modification  of  the  adsorbent  with  a  strong  oxidizing  agent  like  trioxonitrate  (IV) produces  acidic  oxide  which  significantly  influences  the  ultimate  adsorption  properties  of  the  adsorbent  towards metal  ions  and  the  removal  of  the  metal  ions  from  the  study  was  seen  to  be  very  high.  The  sorption  process  was modeled  using  pseudo-first  order  kinetics  and  it  gave  a  good  fit  with  rate  constants  of  1.05x10-2  min-1  and  1.20x102min-1  for  the  lead  (II)  and  Iron  (II)  ions  respectively.  Furthermore,  thermodynamics  indicates  that  the  adsorption process  was  spontaneous  (ΔG  <  0).  Slightly  exothermic  (ΔHo<  0)  and  irreversible  (ΔSo>0).  The  study  significantly revealed  the  presence  of  time,  pH,  temperature  and  concentration  as  important  parameters  to  be  considered  in  the design  of  technique  for  the  treatment  and  management  of  pollution  involving  heavy  metal  pollutants. 


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