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Adsorption of 2,4‐Dichlorophenoxyacetic Acid from an Aqueous Solution on Fly Ash
Author(s) -
Kuśmierek Krzysztof,
Świątkowski Andrzej
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143015x14212658613361
Subject(s) - adsorption , endothermic process , fly ash , chemistry , freundlich equation , aqueous solution , ionic strength , langmuir , nuclear chemistry , chromatography , organic chemistry
The adsorption of 2,4‐dichlorophenoxyacetic acid (2,4‐D) on fly ash was studied. The effects of adsorbent dose, contact time, pH, ionic strength, and temperature on the adsorption were investigated. Adsorption kinetic data were analyzed using pseudo‐first and pseudo‐second order models, and results showed that adsorption kinetics were better represented by the pseudo‐second order model. Adsorption isotherms of 2,4‐D on fly ash were analyzed using the Freundlich and Langmuir models. Thermodynamic parameters (Δ G °, Δ H °, and Δ S °) indicated that the adsorption process was spontaneous and endothermic. The negative values of Δ G ° and the positive value of Δ H ° indicate the spontaneous nature of 2,4‐D adsorption on fly ash, and that the adsorption process was endothermic. Results showed that fly ash is an efficient, low‐cost adsorbent for removal of 2,4‐D from water.