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Please use this identifier to cite or link to this item: http://repository.fuoye.edu.ng/handle/123456789/1292

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.
Keywords: Organotin
Activated carbon
Issue Date: 2013
Publisher: Elsevier
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- lusks.
URI: http://repository.fuoye.edu.ng/handle/123456789/1292
ISSN: 222–230
Appears in Collections:Industrial Chemistry Journal Publications

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