Glyphosate adsorption on montmorillonite: An experimental and theoretical study of surface complexes

Khoury, George; Gehris, Todd C.; Tribe, Lorena; Sánchez, Rosa M. Torres; Afonso, Marı́a dos Santos

doi:10.1016/j.clay.2010.07.018

Cited by 76 publications

(57 citation statements)

References 49 publications

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“…Therefore, the suitability of low-cost and renewable adsorbents, particularly clay-based derivatives has drawn great attention for the remediation of toxic pollutants [9]. Of major interest, montmorillonite has been proposed to be a good candidate [10], evidence from the intercalation of water pollutants by the modification of d(0 0 1) reflection [11][12][13][14][15][16].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

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Feasibility of montmorillonite-assisted adsorption process for the effective treatment of organo-pesticides

Shattar

Zakaria

Foo

2016

Desalination and Water Treatment

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A B S T R A C TOver the years, the emergence of pesticides practice has prevailed to be the most intricate environmental turmoil amongst the scientific community. Specifically, pesticides constitute an accumulative, persistent and detrimental impact towards the survival of flora, fauna and environmental matrix. This has inspired a developing research with a variety of treatment technologies. Adsorption is recognized as the most efficient and promising approach, due to the ease of operation, simplicity of design, insensitivity to the toxic substances and superior capability for removing a broad range of pollutants. Its diverse applications, however, are retarded by the high cost of adsorbents and difficulties associated with regeneration. Montmorillonite and its derivatives, a unique group of under-utilized clay-based minerals has been proposed to be a suitable candidate for the treatment of contaminated wastewater. It plays a key role as the natural scavenger of pesticides, due to the abundantly availability, large specific surface area and high adsorptive and ion exchange properties. This paper describes the origin, physical, chemical and physicochemical properties of natural montmorillonite. The preparation procedure, reusability, commercial product and economical evaluation are highlighted. The specific classification, environmental and health implication of organo-pesticide are discussed. The revolution of montmorillonite-assisted adsorption process for the remediation of organo-pesticide was summarized. Additionally, the characterizations, surface chemistry and mechanism investigation are outlined.

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Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…The shift in the intercalated montmorillonites was related to the local environment of the interlayer space. Results indicated the 1-3 ppm upfield chemical shift for the end-methyl (δC16 ) and methylene (δC15 , δC[2][3][4][5][6][7][8][9][10][11][12][13][14] …”

mentioning

confidence: 99%

Feasibility of montmorillonite-assisted adsorption process for the effective treatment of organo-pesticides

Shattar

Zakaria

Foo

2016

Desalination and Water Treatment

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“…Nevertheless, the OC content has been also positively correlated with adsorption capacity of soils . The great adsorption found for CME soil can be related to the high clay content, and the presence of montmorillonite and hematite, both minerals considered as relevant sorbents for GPS . The lower K f values for GRS soil can be attributed to the low OC content and the lack of the most significant minerals in the adsorption with a montmorillonite content classified as trace.…”

Section: Resultsmentioning

confidence: 99%

“…They belong to the Ultisol order and present variable‐charge clay minerals. The contribution of mineral surfaces to the adsorption process of GPS has been intensively studied . For goethite, a high adsorption has been reported without any relevant effect of pH.…”

Section: Resultsmentioning

confidence: 99%

Determination of glyphosate and aminomethylphosphonic acid in aqueous soil matrices: A critical analysis of the 9‐fluorenylmethyl chloroformate derivatization reaction and application to adsorption studies

Báez

Fuentes

Espina

et al. 2014

J of Separation Science

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The assessment of the environmental fate of glyphosate and its degradation product (aminomethylphosphonic acid) is of great interest given the widespread use of the herbicide. Studies of adsorption-desorption and transport processes in soils require analytical methods with sensitivity, accuracy, and precision suitable for determining the analytes in aqueous equilibrium solutions of varied complexity. In this work, the effect of factors on the yield of the derivatization of both compounds with 9-fluorenylmethyl chloroformate for applying in aqueous solutions derived from soils was evaluated through factorial experimental designs. Interference effects coming from background electrolytes and soil matrices were established. The whole method had a linear response up to 640 ng/mL (R(2) > 0.999) under optimized conditions for high-performance liquid chromatography with fluorescence detection. Limits of detection were 0.6 and 0.4 ng/mL for glyphosate and aminomethylphosphonic acid, respectively. The relative standard deviation was 4.4% for glyphosate (20 ng/mL) and 5.9% for aminomethylphosphonic acid (10 ng/mL). Adsorption of compounds on four different soils was assessed. Isotherm data fitted well the Freundlich model (R(2) > 0.97). Kf constants varied between 93 ± 3.1 and 2045 ± 157 for glyphosate and between 99 ± 4.1 and 1517 ± 56 (μg(1-1/) (n) mL(1/) (n) ( ) g(-1) ) for aminomethylphosphonic acid, showing the broad range of applicability of the proposed method.

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“…7 Due to the chemical similarity between the GLP phosphonate group and inorganic phosphates, they compete with each other for the same sorption sites at soil components. 8,9 In soil, GLP binds to heavy metals, 6,10 soil organic matter (SOM), 11,12 and soil minerals 13,14 . The strong binding to mineral surfaces is commonly taken as an important factor for the deactivation of GLP in soil, 15,16 which leads to a reduction of its mobility and herbicide efficiency 17,18 .…”

Section: Introductionmentioning

confidence: 99%

Unravelling the nature of glyphosate binding to goethite surfaces by ab initio molecular dynamics simulations

Ahmed

Leinweber

Kühn

2017

Preprint

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a Investigation of the interaction between glyphosate (GLP) and soil minerals is essential for understanding GLP's fate in the environment. Whereas GLP-goethite binding has been discussed extensively, the impact of water as well as of different goethite surface planes has not been studied yet. In this contribution, periodic density functional theory-based molecular dynamics simulations are applied to explore possible binding mechanisms for GLP with three goethite surface planes (010, 001, and 100) in the presence of water. The investigation included several binding motifs of monodentate (M) and bidentate (B) type. It was found that the binding stability increasing in the order M@001 < M@010 < 2O+2Fe B@100 < M@100 < 1O+2Fe B@001 < 2O+1Fe B@010. This behavior has been traced to the presence of intramolecular H-bonds (HBs) in GLP, intermolecular HBs between GLP and water, GLP and goethite, and water and goethite. These interactions are accompanied by proton transfer from GLP to water and to goethite, and from water to goethite as well as water dissociation at the goethite surface. Further, it was observed that OH -species can replace the adsorbed GLP at the goethite surface, which could explain the well-known drastic drop in the GLP adsorption at high pH. The present results highlight the role of water in the GLPgoethite interaction and provide a molecular level prospect on available experimental data.

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Glyphosate adsorption on montmorillonite: An experimental and theoretical study of surface complexes

Cited by 76 publications

References 49 publications

Feasibility of montmorillonite-assisted adsorption process for the effective treatment of organo-pesticides

Feasibility of montmorillonite-assisted adsorption process for the effective treatment of organo-pesticides

Determination of glyphosate and aminomethylphosphonic acid in aqueous soil matrices: A critical analysis of the 9‐fluorenylmethyl chloroformate derivatization reaction and application to adsorption studies

Unravelling the nature of glyphosate binding to goethite surfaces by ab initio molecular dynamics simulations

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