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Synthesis and characterisation of acid/basic modified adsorbents. Application for chlorophenols removal by Joaquín R. Domínguez; Carlos J. Durán-Valle; Germán Mateos-García is a Environmental Science article available to read on EtoBox.

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A commercial activated carbon was modified with acid and basic reagents -an acidic one via treatment with sulphuric acid and a basic via treatment with pentaethylenehexamine-to yield adsorbents with different surface acid/base character. These modified adsorbents were characterised by elemental and immediate analysis, N 2 adsorption, XPS and point zero charge measurements. The new adsorbents were tested for chlorophenols removal in water (4-chlorophenol, 3,5-dichlorophenol, 2,4,6-trichlorophenol, 2,3,4,6-tetrachlorophenol and pentachlorophenol) at different temperatures. Although the calculated process enthalpy was positive for all cases, indicating an endothermic process, the entropy was positive, resulting in a negative Gibbs free energy and spontaneous process. The adsorption capacity increases with temperature and decreases when the phenols' number of substituents increases. The modified acid-activated carbon demonstrated an exciting higher adsorbing capacity from 426.9 to 742.3 mg g -1 for 2,4,6-trichlorophenol, whereas the adsorption capacity for the basic ranged between 142.9 and 238.0 mg g -1 . The Langmuir model satisfactorily fitted the adsorption equilibrium data for all

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Author

Joaquín R. Domínguez; Carlos J. Durán-Valle; Germán Mateos-García

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)