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|Title: ||Kinetics and equilibrium models for the sorption of tributyltin to nZnO, activated carbon and nZnO/activated carbon composite in artificial seawater|
|Authors: ||Ayanda, Olushola S.|
Ximba, Bhekumusa J.
Adekola, Folahan A.
Fatoki, Olalekan S.
|Issue Date: ||2013|
|Abstract: ||The removal of tributyltin (TBT) from artificial seawater using nZnO, activated carbon and nZnO /activated carbon composite was systematically studied. The equilibrium and kinetics of adsorption were investi-
gated in a batch adsorption system. Equilibrium adsorption data were analyzed using Langmuir, Freund-
lich, Temkin and Dubinin–Radushkevich (D–R) isotherm models. Pseudo first- and second-order, Elovich,
fractional power and intraparticle diffusion models were applied to test the kinetic data. Thermodynamic
parameters such as DG°, DS° and DH° were also calculated to understand the mechanisms of adsorption.
Optimal conditions for the adsorption of TBT from artificial seawater were then applied to TBT removal
from natural seawater. A higher removal efficiency of TBT (>99%) was obtained for the nZnO/activated carbon composite material and for activated carbon but not for nZnO.|
|Description: ||Tributyltin (TBT) is an organotin compound (OTC) that is used
in the manufacturing of antifouling paints and is highly effective
against fouling organisms. TBT is used to prevent the growth of
fouling organisms on marine structures and vessels. TBT toxicity
has been a large problem in aquatic environments. High concentra-
tions of TBT have been found in the tissues of marine mammals
and its presence has been linked to marine mammal mass mortal-ities. TBT causes imposex and calcification abnormalities in mol-
|Appears in Collections:||Industrial Chemistry Journal Publications|
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