Acid modified natural clay as a judicious solution for the successive treatment of ametryn

Shattar, S.F.A.; Zakaria, Norasalwa; Foo, K.Y.

doi:10.5004/dwt.2018.21935

Cited by 7 publications

(3 citation statements)

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“…Accordingly, electrostatic attraction is considered to be one of the most impactful interaction between the MB dye molecules with the clay based adsorbent. Other governing mechanisms for sorption process are H-bonding between the H atom available on the surface of BB, and the N within atom in the MB dye structure, and n-π between the delocalization of the lone pair electron of O atoms into the π orbital of the dye aromatic rings 56 .…”

Section: Resultsmentioning

confidence: 99%

Sodium salt-assisted low temperature activation of bentonite for the adsorptive removal of methylene blue

Shattar

Foo

2022

Sci Rep

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The sodium salt-assisted low temperature activation of bentonite (BB) was attempted. The unique features of the raw bentonite and BB were characterized with respect to the morphological, functional, and textural analysis. The adsorptive behaviour was evaluated by adopting methylene blue (MB) as the model pollutant via batch adsorption experiment. The experimental data were fitted to the non-linear isotherm equations (Freundlich, Langmuir, and Temkin), while the adsorption modelling was interpreted by the pseudo-first order, pseudo-second order and Elovich models. The adsorptive mechanism was ascertained according to intraparticle-diffusion and boyd models. The intercalation of sodium salt into the bentonite surface give rise to the specific surface area and total pore volume from 120.34 to 426.91, m2/g and 0.155 to 0.225 cm3/g, respectively, indicating a large proportion of the newly formed surfaces may be connected to new pore walls, associated with the silanol (≡SiOH), and aluminol (≡AlOH), and hydroxyl (–OH) groups for the possible entrapment MB onto the adsorbent. The equilibrium data was satisfactory described by the Langmuir isotherm and pseudo-second order model, with a monolayer adsorption capacity for MB of 318.38 mg/g, while the thermodynamic study verified spontaneous, feasible, and endothermic of the adsorption process.

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Section: Resultsmentioning

confidence: 99%

Sodium salt-assisted low temperature activation of bentonite for the adsorptive removal of methylene blue

Shattar

Foo

2022

Sci Rep

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“…Shattar et al studied the adsorption of the herbicide ametryn (a triazine) onto an acid-activated natural clay mineral [51] and commercial montmorillonite [52,53], testing the classical kinetic adsorption isotherm models. Since the pKa of ametryn is 4.1 (Table 1), it is positively charged at pH < pKa because of the protonation of the isopropylamine and ethylamine groups, thus favoring electrostatic interaction and ion exchange retention processes with the clay mineral.…”

Section: Natural Homoionic Clay Minerals As Pesticide Adsorbentsmentioning

confidence: 99%

“…Since the pKa of ametryn is 4.1 (Table 1), it is positively charged at pH < pKa because of the protonation of the isopropylamine and ethylamine groups, thus favoring electrostatic interaction and ion exchange retention processes with the clay mineral. This hypothesis was confirmed by performing adsorption experiments in the pH range between 2 and 12, with the highest adsorbed loads found at pH 2.0 [51,52]. Despite the demonstrated importance of pH, the authors did not specify the pH at which they performed the kinetic, isothermal, and thermodynamic experiments.…”

Section: Natural Homoionic Clay Minerals As Pesticide Adsorbentsmentioning

confidence: 99%

Guidelines to Study the Adsorption of Pesticides onto Clay Minerals Aiming at a Straightforward Evaluation of Their Removal Performance

Masini

Abate

2021

Minerals

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Natural and modified clay minerals have been extensively used for the adsorption/desorption of organic substances, especially pesticides, from waters and wastewater, aiming at pollution control and more efficient use of the herbicides through controlled release. While natural clay minerals efficiently remove organic cations such as paraquat and diquat, the adsorption of anionic or neutral species demands surface chemical modification with, for instance, quaternary ammonium salts containing long alkyl chains. Basic pesticides, on the other hand, are better absorbed in clay minerals modified with polycations. Kinetic studies and adsorption/desorption isotherms provide the parameters needed to evaluate the clay mineral’s adsorptive performance towards the pollutant target. However, the direct comparison of these parameters is complicated because the experimental conditions, the analytical techniques, the kinetic and isotherm models, and the numerical fitting method differ among the various studies. The free-energy-related Langmuir constant depends on the degree of site occupation; that is, it depends on the concentration window used to construct the adsorption isotherm and, consequently, on the analytical technique used to quantify the free concentrations. This paper reviews pesticides’ adsorption on natural and modified clay minerals and proposes guidelines for designing batch adsorption/desorption studies to obtain easily comparable and meaningful adsorption parameters. Articles should clearly describe the experimental conditions such as temperature, contact time, total concentration window, the solution to adsorbent ratio, the analytical technique, and its detection and quantification limits, besides the fitting models. Research should also evaluate the competitive effects of humic substances, colloidal inorganic particles, and ionic strength to emulate real-world adsorption experiments.

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Removal and Release of the 2,4,5-Trichlorophenoxyacetic Acid Herbicide from Wastewater by Layered Double Hydroxides

Mourid

Lakraimi

Legrouri

2021

J Inorg Organomet Polym

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Acid modified natural clay as a judicious solution for the successive treatment of ametryn

Cited by 7 publications

References 0 publications

Sodium salt-assisted low temperature activation of bentonite for the adsorptive removal of methylene blue

Sodium salt-assisted low temperature activation of bentonite for the adsorptive removal of methylene blue

Guidelines to Study the Adsorption of Pesticides onto Clay Minerals Aiming at a Straightforward Evaluation of Their Removal Performance

Removal and Release of the 2,4,5-Trichlorophenoxyacetic Acid Herbicide from Wastewater by Layered Double Hydroxides

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