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Título: 2,4-Dichlorophenoxyacetic acid adsorption on montmorillonite organoclay for controlled release applications
Palavras-chave: Organically modifed nanoclay
Adsorption studies
Controlled release
Agriculture applications
Data do documento: 2019
Editor: Elsevier
Citação: NATARELLI, C. V. L. et al. 2,4-Dichlorophenoxyacetic acid adsorption on montmorillonite organoclay for controlled release applications. SN Applied Sciences, [S.l.], v. 1, 2019.
Resumo: 2,4-Dichlorophenoxyacetic acid (2,4-D) is one of the most used herbicides for weed control. However, the use of large concentrations of 2,4-D is dangerous and have great carcinogenic potential. Thus, this work evaluated the 2,4-D sorption behavior by an organically modifed montmorillonite nanoclay using kinetic and thermodynamic approaches. Adsorption isotherms and kinetic studies, conducted under controlled temperature and pH conditions, indicated a high capacity of the nanoclay to remove 2,4-D from aqueous medium, being that the adsorption mechanism probably involved physisorption and chemisorption. Besides, thermodynamic parameters obtained showed that the adsorption was enthalpically driven for the physisorption step, with ΔH◦=−9.849 kJ mol−1. The analyses showed that 2,4-D adsorption caused a partial exfoliation of the montmorillonite structure, probably due to the high herbicide concentration utilized. Release studies of 2,4-D from the nanoclay showed that the desorption process occurred in two steps, a burst release of the 2,4-D molecules followed by a slow release. The results demonstrated by this study indicates the feasibility of the proposed system for controlled release or even water treatment applications.
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