Interaction between glyphosate and montmorillonite in the presence of artificial seawater

Pereira, Rodrigo C.; Costa, Antônio Carlos Saraiva da; Ivashita, Flávio F.; Paesano, Andrea; Zaia, Dimas Augusto Morozin

doi:10.1016/j.heliyon.2020.e03532

Cited by 21 publications

(10 citation statements)

References 55 publications

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“…On the other hand, the carboxylate, amine, and phosphonate groups make them chelating substances that interact with surface-bound metal ions such as Fe(III), Fe(II), Ca(II), Mg(II). Pereira et al investigated the adsorption of glyphosate onto Mt in the artificial seawater and different saline solutions, noticing that the complexation of Ca(II) by glyphosate enhanced the adsorption onto the clay mineral to a larger extension than complexation with Mg(II) or Na + [56]. Thus, the glyphosate chelating functionalities interact with Mt via surface complexation with metal cations and silanol/hydroxyl groups [49,56].…”

Section: Natural Homoionic Clay Minerals As Pesticide Adsorbentsmentioning

confidence: 99%

“…Pereira et al investigated the adsorption of glyphosate onto Mt in the artificial seawater and different saline solutions, noticing that the complexation of Ca(II) by glyphosate enhanced the adsorption onto the clay mineral to a larger extension than complexation with Mg(II) or Na + [56]. Thus, the glyphosate chelating functionalities interact with Mt via surface complexation with metal cations and silanol/hydroxyl groups [49,56]. No kinetic investigation was undertaken, and the adsorption experiments adopted 24 h contact time, best fitting the one-or two-site Sips isotherm [56].…”

Section: Natural Homoionic Clay Minerals As Pesticide Adsorbentsmentioning

confidence: 99%

“…Thus, the glyphosate chelating functionalities interact with Mt via surface complexation with metal cations and silanol/hydroxyl groups [49,56]. No kinetic investigation was undertaken, and the adsorption experiments adopted 24 h contact time, best fitting the one-or two-site Sips isotherm [56]. Because glyphosate has excess negative charges at pH 7.0, it cannot easily penetrate the interlayer space.…”

Section: Natural Homoionic Clay Minerals As Pesticide Adsorbentsmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Natural Homoionic Clay Minerals As Pesticide Adsorbentsmentioning

confidence: 99%

Section: Natural Homoionic Clay Minerals As Pesticide Adsorbentsmentioning

confidence: 99%

Section: Natural Homoionic Clay Minerals As Pesticide Adsorbentsmentioning

confidence: 99%

See 1 more Smart Citation

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

Masini

Abate

2021

Minerals

View full text Add to dashboard Cite

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“…A time of 90 min will therefore be used as the equilibrium time for the study of all the isotherms. The adsorption of glyphosate on 3 Chilean soils gave the same equilibrium time of 90 min as well as the adsorption of glyphosate on activated carbon based on the bark of Eucalyptus camaldulensis [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. To acquire the order of the glyphosate adsorption kinetic, four kinetic models were used [5]:…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…The study of the adsorption of glyphosate on the soil or on soil components as well as its degradation by microorganisms are widely carried out and reported in the literature [8][9]. Thus the adsorptions of glyphosate on clay minerals [10], on ferric oxides [11], as well as its degradation by microorganisms [12] were carried out. These studies show a strong influence of the pH on the elimination of glyphosate.…”

Section: Introductionmentioning

confidence: 99%

Study of Potential Adsorption of Glyphosate on Iron-textured Soil

Urbain¹,

Ollo²,

Gains³

et al. 2021

AJAC

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The main goal of this study is to evaluate the potential for glyphosate to contaminate water and ground water. For this purpose, the adsorption of glyphosate on a soil of culture in West of Côte d'Ivoire is investigated. The chemical composition of the soil, the different materials that compose it as well as the pH of zero charge of this soil were determined. The results revealed that the soil sample was rich in iron oxide mainly goethite, phengite and anatase. Adsorption kinetics was studied and the rate of sorption was found to conform to pseudo-second-order kinetics with 90 min as equilibrium time. Equilibrium isotherm data were analyzed according to Langmuir and Freundlich models. The two models describe the adsorption phenomenon well. The soil is heterogeneous with a good affinity between the metal oxides of the soil and the glyphosate. The maximum adsorption capacities were determined to be 2.68 mg/g. Parameters such as the initial pH of the solution, the mass of soil and the temperature were well investigated. It is observed that the adsorbed amount of glyphosate increases with temperature, reflecting the endothermic nature of the adsorption. The maximum amount of glyphosate adsorbed at 40°C is approximately 3 mg/g. The amount of glyphosate adsorbed increases with the initial concentration and decreases with the increase of pH. The optimal pH is therefore 5.

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Glyphosate adsorption on synthetic allophanes and halloysite: Effects of pH and mineral properties

Remlinger,

Lenhardt,

Rechberger

et al. 2023

J. Plant Nutr. Soil Sci.

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BackgroundGlyphosate (GLP) is a widely used herbicide with possible adverse effects on human health and the environment. In soils, GLP strongly adsorbs on clay‐sized minerals, depending on pH, the amount of organic carbon, as well as the contents and properties of Al and Fe oxyhydroxides and clay minerals. Many clay‐sized minerals have already been investigated regarding GLP adsorption behavior, but information on minerals commonly found in volcanic soils is still lacking.AimThe aim of this study was to investigate for the first time the pH‐dependent adsorption of GLP on allophane and halloysite, typical minerals found in volcanic soils.MethodsGLP adsorption was studied in batch experiments at three pH values (5, 6, and 7). Synthetic allophanes with two different initial Al:Si ratios (1.4 and 1.8) and a halloysite were used as adsorbents.ResultsThe adsorption capacity (AC) increased with rising Al:Si ratio and decreasing pH. The AC of allophane was significantly higher than that of halloysite. GLP adsorption on allophane was larger than that reported for other clay minerals and Al and Fe oxyhydroxides, especially at low pH. The AC of halloysite was higher than reported for most other clay minerals.ConclusionDifferent mineral formation pathways in volcanic soils, notably the formation of halloysite versus allophanes, strongly affect the soils’ retention capacity for GLP. The high AC of allophanes may induce the low mobility of GLP in allophane‐containing soils. Long‐term use of GLP may accumulate the herbicide in these soils with potential effects on biodiversity and ecosystem services.

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Interaction between glyphosate and montmorillonite in the presence of artificial seawater

Cited by 21 publications

References 55 publications

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

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

Study of Potential Adsorption of Glyphosate on Iron-textured Soil

Glyphosate adsorption on synthetic allophanes and halloysite: Effects of pH and mineral properties

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