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Mechanistic pathways of cationic and anionic surfactants sorption by kaolinite in water

  • Surfactants are widely used in many chemical industries and as primary components of cleaning detergents due to their specific characteristics, which in turn results in high pollution of domestic and industrial wastewaters by such substances. In this study, the mechanistic pathways of the adsorption of cationic benzyl-dimethyl-dodecyl ammonium bromide (BDDAB) and anionic sodium dodecyl sulfate (SDS) surfactants on kaolinite clay in water were investigated. The results showed that the adsorption of anionic surfactant (SDS) on kaolinite is better compared with cationic surfactant (BDDAB), wherein the ♦maximum adsorption capacity was found 161.4 μmol g−1 and 234 μmol g−1 for BDDAB and SDS, respectively. Adsorption kinetics were the best suited to pseudo-second-order model for both BDDAB and SDS with an adsorption rate constant of 0.028 g μmol−1 min−1 and 0.023 g μmol−1 min−1, respectively. Meanwhile, the adsorption of BDDAB by kaolinite showed that the isotherm adsorption tended to follow the Langmuir-Freundlich and Freundlich isothermSurfactants are widely used in many chemical industries and as primary components of cleaning detergents due to their specific characteristics, which in turn results in high pollution of domestic and industrial wastewaters by such substances. In this study, the mechanistic pathways of the adsorption of cationic benzyl-dimethyl-dodecyl ammonium bromide (BDDAB) and anionic sodium dodecyl sulfate (SDS) surfactants on kaolinite clay in water were investigated. The results showed that the adsorption of anionic surfactant (SDS) on kaolinite is better compared with cationic surfactant (BDDAB), wherein the ♦maximum adsorption capacity was found 161.4 μmol g−1 and 234 μmol g−1 for BDDAB and SDS, respectively. Adsorption kinetics were the best suited to pseudo-second-order model for both BDDAB and SDS with an adsorption rate constant of 0.028 g μmol−1 min−1 and 0.023 g μmol−1 min−1, respectively. Meanwhile, the adsorption of BDDAB by kaolinite showed that the isotherm adsorption tended to follow the Langmuir-Freundlich and Freundlich isotherm models. However, the SDS adsorption isotherm obeyed only the Langmuir-Freundlich model.show moreshow less

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Author: Mamoun Fellah, Naouel Hezil, Kamel Guerfi, Ridha Djellabi, Alex Montagne, Alain Iost, Kirill Borodin, Aleksei ObrosovORCiD
URL:https://link.springer.com/article/10.1007/s11356-020-11083-6
DOI:https://doi.org/10.1007/s11356-020-11083-6
ISSN:1614-7499
Title of the source (English):Environmental Science and Pollution Research
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2021
Tag:Adsorption; Adsorption modeling; Kaolinite; Surfactant; Water remediation
Volume/Year:28
Issue number:6
First Page:7307
Last Page:7321
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Metallkunde und Werkstofftechnik
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