Adsorption of herbicide 2,4-D from aqueous solution using organo-modified bentonite clay

This study analyzed the performance of organophilic clays obtained from the chemical modification of sodium bentonite clay when applied to the adsorption of herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). Kinetic curves and equilibrium isotherms were obtained in order to determine time and adsorpt...

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Veröffentlicht in:Environmental science and pollution research international 2019-06, Vol.26 (18), p.18329-18342
Hauptverfasser: de Souza, Fernando Manzotti, dos Santos, Onélia Aparecida Andreo, Vieira, Melissa Gurgel Adeodato
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Sprache:eng
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Zusammenfassung:This study analyzed the performance of organophilic clays obtained from the chemical modification of sodium bentonite clay when applied to the adsorption of herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). Kinetic curves and equilibrium isotherms were obtained in order to determine time and adsorption capacity of the material, as well as understand the mechanisms involved in this phenomenon. The results showed that the most predictive kinetic model for experimental data was of pseudo-second order (R 2  > 0.98), and that external mass transfer is the dominant factor in the time of operation. Isotherms were obtained at temperatures of 298, 308, and 318 K, under which the Dubinin-Radushkevich model was shown to have a good fit to data (R 2  > 0.96), according to mathematical adjustments. The maximum adsorption capacity obtained experimentally was 50.36 mg g −1 , found at a temperature of 298 K, being higher or compatible with other materials reported in the literature. With help of the thermodynamic studies on the process, it was observed that the adsorption of 2,4-D in organophilic clays refers to a spontaneous (ΔG° ads  
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-019-05196-w