Adsorption of Glyphosate on Resin Supported by Hydrated Iron Oxide: Equilibrium and Kinetic Studies

Jia, Dongmei; Zhou, Chao; Li, Changhai

doi:10.1002/j.1554-7531.2011.tb00268.x

Cited by 15 publications

(7 citation statements)

References 35 publications

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“…A pseudo-second-order model showed the best fit with the experimental results (Table 4). This is another indication that the glyphosate adsorption onto ferrihydrite occurs by inner sphere complexation [58, 59]. In addition, for this model, the q e obtained (48.8 mg g −1 ) (Table 5) was close to the theoretical limit for adsorbed glyphosate (54.88 mg g −1 ) determined using the Langmuir isotherm model (Table 2).…”

Section: Resultssupporting

confidence: 76%

The effect of pH and ionic strength on the adsorption of glyphosate onto ferrihydrite

et al. 2019

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Although, glyphosate (N-(phosphonomethyl) glycine) is one of the most widely used herbicides in the world, its interaction with poorly crystalline iron oxides, such as ferrihydrite, is not well studied. In this research, we examined the adsorption of glyphosate onto ferrihydrite using infrared spectroscopy (FT-IR), electron paramagnetic resonance spectroscopy (EPR), adsorption kinetic models and adsorption isotherm models. The effect of pH and sodium chloride concentration on the adsorption of glyphosate onto ferrihydrite as well as the effect of extractors (CaCl2 0.010 mol L−1 and Mehlich) on the desorption of glyphosate were also evaluated. There are two important findings described in this work. First, 84% of adsorbed glyphosate strongly interacted to ferrihydrite as an inner-sphere complex and phosphate and amine groups are involved in this interaction. Second, an increase of sodium chloride salt concentration increased the adsorption of glyphosate onto ferrihydrite. The non-linear Langmuir model and pseudo second order model showed a good agreement of theoretical limit of glyphosate adsorbed onto ferrihydrite, 54.88 µg mg−1 and 48.8 µg mg−1, respectively. The adsorption of glyphosate onto ferrihydrite decreased when the pH increased. Under the conditions used in this work, EPR spectra did not show dissolution of ferrihydrite. Surface area, pore volume and pHpzc of ferrihydrite decreased after adsorption of glyphosate.Electronic supplementary materialThe online version of this article (10.1186/s12932-019-0063-1) contains supplementary material, which is available to authorized users.

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Section: Resultssupporting

confidence: 76%

The effect of pH and ionic strength on the adsorption of glyphosate onto ferrihydrite

et al. 2019

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“…Materials used for PMG adsorption are briefly summarized in Table . The adsorption capacity of MT with Fe(III) is much higher than those of most mineral adsorbents investigated so far, except for the resin reported by Jia et al MgAl LDH and NiAl LDH have capacities comparable to that of the Fe(III)–MT system. However, these LDHs and the Jia et al resin are not economical and are not as conveniently available as MT, as they have to be artificially synthesized or processed.…”

Section: Resultsmentioning

confidence: 72%

Enhanced Glyphosate Removal by Montmorillonite in the Presence of Fe(III)

Ren

Dong

2014

Ind. Eng. Chem. Res.

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N-(Phosphonomethyl)glycine (glyphosate, PMG) is an effective broad-spectrum organic phosphoric herbicide. The mass production and wide use of PMG presents a potential environmental hazard. This study evaluated the feasibility of using montmorillonite (MT) as an adsorbent to remove PMG from wastewater in the presence of Fe(III) ions. The results showed that the PMG adsorption process is dependent on the Fe(III) concentration. Adsorption was fast, and the adsorption kinetics were best described by a pseudo-second-order model. Adsorption of PMG was most effective over the pH range from 1.9 to 4.1. Ionic strength was found to have little effect on PMG removal at pH < 4.1 but to enhance PMG removal at pH > 4.1. Competing ions reduced the PMG removal at low pH (pH < 5.9) but increased the PMG removal at pH > 5.9. The adsorption capacity was found to be greater than 210 mg/g. The mechanism of this removal process is discussed in detail in terms of XRD and species calculations.

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“…Thermodynamic Study. The thermodynamic parameters of the adsorption process were determined on the experimental data obtained by using the following equations (Jia et al, 2011):…”

Section: Resultsmentioning

confidence: 99%

Adsorption Kinetic and Thermodynamic Studies of Phosphate onto Tantalum Hydroxide

Dong

Gong

et al. 2012

Water Environment Research

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BSTRACT: Tantalum hydroxide exhibits the ability for the removal of phosphate from aqueous solution. The kinetic study, adsorption isotherm, thermodynamic study, desorption, and foreign anions effect were examined in batch experiments. The kinetic process was very well described by a pseudo-second-order rate model. The adsorption isotherms showed that phosphate uptake fitted with a Langmuir-type model very well, with an increase of PO4^' adsorption capacity from 78.5 to 97.0 mg/g when the temperature increased from 298 to 338 K. The negative values of zfG" and the positive values of AH" indicated that the phosphate adsorption process was spontaneous and endothermic naturally. While the Ay values obtained were positive, indicating an increase in randomness at the solid-liquid interface during the adsorption. Foreign anions tests showed that the presence of competitive ions cause minimal interference with the adsorption of phosphate on tantalum hydroxide. Water Environ. Res., 84, 2115Res., 84, (2012.

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Adsorption of Glyphosate on Resin Supported by Hydrated Iron Oxide: Equilibrium and Kinetic Studies

Cited by 15 publications

References 35 publications

The effect of pH and ionic strength on the adsorption of glyphosate onto ferrihydrite

The effect of pH and ionic strength on the adsorption of glyphosate onto ferrihydrite

Enhanced Glyphosate Removal by Montmorillonite in the Presence of Fe(III)

Adsorption Kinetic and Thermodynamic Studies of Phosphate onto Tantalum Hydroxide

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