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Detoxification of copper
fungicide using EDTA-modified cellulosic material
Igwe, J. C.1*, Ekwuruke, A.1,
Gbaruko, B. C.2 and Abia, A. A.3
1Department
of Industrial Chemistry, Abia State University, P.M.B. 2000
Uturu, Abia State, Nigeria.
2Department
of Chemistry, Jackson State University, Jackson, MS 39217,
U.S.A.
3Department
of Pure and Industrial Chemistry, University of Port
Harcourt, River State, Nigeria.
*Corresponding author email:
jcigwe2001@yahoo.com.
Accepted
16 November, 2006 |
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Pesticides are poisons and can be particularly dangerous when
misused or carelessly disposed. The detoxification of a
copper fungicide (KOCIDE 101) using maize cob, a cellulosic
material, was studied. Based on copper as the active agent
(after a sorption period of 1 h), the concentration of the
fungicide reduced from an initial value of 2000 to 206.25
ppm for the unmodified maize cob and to 24.31 ppm for the
modified maize cob. The pseudo-first and second order rate
equations were used to model the detoxification process. The
intraparticle diffusivity and mechanism of the sorption was
proposed. Also, equilibrium sorption isotherms were
evaluated using the Freundlich, Langmuir and
Dubinin-Radushkevich isotherm models. This results show that
maize cob is an effective adsorbent for copper fungicide
deactivation and detoxification.
Key
words:
Copper fungicide, maize cob, adsorption, mechanism, EDTA,
detoxification. |
