Thermodynamics of carbofuran adsorption on pyrite

► We examined the carbofuran adsorption by pyrite. ► Carbofuran optimally adsorbed on pyrite around pH ∼1.70. ► Pyrite sites showed homogeneity for carbofuran-surface interactions. ► Carbofuran showed a slow degradation on pyrite sites when exposed to prolong periods. Thermodynamic parameters of car...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 2012-08, Vol.51, p.1-7
Main Authors: Makehelwala, M., Weerasooriya, R., Jayaratne, L., Dissanayake, C.B.
Format: Article
Language:English
Subjects:
Adsorption
Carbofuran
Chemical thermodynamics
Chemistry
Dissolution
Exact sciences and technology
General and physical chemistry
General. Theory
Heterogeneity
Langmuir equation
Mathematical models
Non-variable charge (nvc) models
Pyrite
Surface chemistry
Thermodynamics
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Summary:► We examined the carbofuran adsorption by pyrite. ► Carbofuran optimally adsorbed on pyrite around pH ∼1.70. ► Pyrite sites showed homogeneity for carbofuran-surface interactions. ► Carbofuran showed a slow degradation on pyrite sites when exposed to prolong periods. Thermodynamic parameters of carbofuran adsorption on pyrite were determined from experimental data. In order to minimize the dissolution of pyrite as well the degradation of carbofuran, all experiments were restricted to (15 to 20)min. The maximum adsorption capacity of carbofuran varied with both pH and temperature in the order: ΓcarbmaxpH1.77>ΓcarbmaxpH2.70>ΓcarbmaxpH4.01. The Dubinin–Radushkevick (D–R) model was used to assess the degree of site heterogeneity. The interactions between carbofuran and surface sites can largely be ascribed to specific chemical interactions.
ISSN:0021-9614
1096-3626
DOI:10.1016/j.jct.2012.02.010