SORPTION OF METAL IONS FROM AQUEOUS SOLUTION BY POLYMER RESINS:DEVELOPMENT OF A GENERALIZED KINETIC MODEL
SORPTION OF METAL IONS FROM AQUEOUS SOLUTION BY POLYMER RESINS:DEVELOPMENT OF A GENERALIZED KINETIC MODEL
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Date
1995-06
Authors
AKPAN, D. GEORGE
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Abstract
A generalised kinetic model for sorption of metal ions by some sets
of polymer resins from aqueous solutions has been developed. For this to be
effectively done, one resin type (amberlite IRA 400 CI-, AD 54 OH-, and
amberlite IR 45 OH-) was respectively chosen from each set having similar
properties for the kinetic study.
All attempts to conduct the sorption of tungsten by amberlite IR 45
OH- became impossible. The rate of sorption of molybdenum by amberlite IRA
400 CI- was faster than the sorption of tungsten by amberlite 400 CI- and
sorption of tungsten by AD 54 OH- resins. The activation energy of sorption
was respectively found to be 11.60KJ, 21.90KJ and 32.50KJ.
AD 54 OH- resin possess better mechanical property, and hence, more
selective, (though it exhibited low exchange rate) in tungsten solution as
it was found to be stable in same solution even at 70°C operation
temperature. But amberlite 400 CI- dissolved in both tungsten and molybdenum
solutions at temperature slightly higher than 40°C.
A two active sites first order reversible kinetic model was proposed
to test the sorption processes thus:
C = (C0-Ce)*(eexp(-C0/(C0-Ce))K1t + (l-6)exp(-C0/(C0-Ce) )K2t) + Ce
This model was found to fit the sorption of tungsten by both amberlite
IRA 400 CI- and IONAC AD 54 OH-, and the sorption of molybdenum by amberlite
IRA 400 CI- to over 90 % confidence limits.
Description
A Thesis Submitted to The Postgraduate School, Ahmadu
Bello University in partial fulfillment for the award of
the degree Master of Science in Chemical Engineering,
Department of Chemical Engineering,
Ahmadu Bello University,
Zaria.
JULY, 1995
Keywords
SORPTION,, METAL IONS,, AQUEOUS,, POLYMER,, GENERALIZED,, KINETIC