The two-species phosphate adsorption kinetics on goethite

Arroyave, Jeison Manuel; Avena, Marcelo Javier; Tan, Wenfeng; Wang, Mingxia

doi:10.1016/j.chemosphere.2022.135782

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…As a result, we turned to ATR-FTIR to examine NO 3 – complexation. ATR-FTIR analysis exhibited a broad peak at 1365 cm –1 , attributed to NO 3 – outer-sphere complexes (Figure S1), consistent with previous studies. ,− Additionally, the results indicated that PO 4 3– was entirely adsorbed on Fh (0.6 mM) and was not released into the solution during the Fh transformation, as no PO 4 3– was detected in the solution phase throughout the aging experiment. In contrast, IC analysis revealed that out of the initial 100 mM NO 3 – concentration, approximately 60.9 ± 0.3 mM NO 3 – was adsorbed, with approximately 5.8 mM desorbing from the Fh surface with aging.…”

Section: Resultsmentioning

confidence: 99%

Goethite and Hematite Nucleation and Growth from Ferrihydrite: Effects of Oxyanion Surface Complexes

Namayandeh,

Zhang,

Watson

et al. 2024

Environ. Sci. Technol.

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The presence of oxyanions, such as nitrate (NO3 –) and phosphate (PO4 3–), regulates the nucleation and growth of goethite (Gt) and hematite (Hm) during the transformation of ferrihydrite (Fh). Our previous studies showed that oxyanion surface complexes control the rate and pathway of Fh transformation to Gt and Hm. However, how oxyanion surface complexes control the mechanism of Gt and Hm nucleation and growth during the Fh transformation is still unclear. We used synchrotron scattering methods and cryogenic transmission electron microscopy to investigate the effects of NO3 – outer-sphere complexes and PO4 3– inner-sphere complexes on the mechanism of Gt and Hm formation from Fh. Our TEM results indicated that Gt particles form through a two-step model in which Fh particles first transform to Gt nanoparticles and then crystallographically align and grow to larger particles by oriented attachment (OA). In contrast, for the formation of Hm, imaging shows that Fh particles first aggregate and then transform to Hm through interface nucleation. This is consistent with our X-ray scattering results, which demonstrate that NO3 – outer-sphere and PO4 3– inner-sphere complexes promote the formation of Gt and Hm, respectively. These results have implications for understanding the coupled interactions of oxyanions and iron oxy-hydroxides in Earth-surface environments.

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Section: Resultsmentioning

confidence: 99%

Goethite and Hematite Nucleation and Growth from Ferrihydrite: Effects of Oxyanion Surface Complexes

Namayandeh,

Zhang,

Watson

et al. 2024

Environ. Sci. Technol.

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“…MPA was studied as a model for glyphosate for two main reasons: it contains in its structure a phosphonate group that strongly binds to most of the environmentally relevant oxides, and second, this ligand is a terminal moiety of glyphosate. As it is well known, glyphosate is rapidly immobilized upon contact with goethite. , …”

Section: Methodsmentioning

confidence: 99%

“…As it is well known, glyphosate is rapidly immobilized upon contact with goethite. 20,21 The activation barriers (E act ) were found using the climbing image nudged elastic band method (CI-NEB). 22 This technique allows for finding the minimal energy pathway between the initial (IS) and final (FS) states of an activated process.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Electronic-Level Insight into the Adsorption and Surface Diffusion Kinetics of a Simplified Glyphosate Model on a Goethite Surface

Alfonso T,

Olmos-Asar,

Mariscal

et al. 2023

Langmuir

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The diffusive processes that occur in minerals involve chemical and physical surface phenomena of great interest that allow for understanding the mobility of different anions of environmental importance. One of them is glyphosate, which is widely used as a pesticide. In this work, we performed Hubbard-corrected density functional theory (DFT + U) calculations to study the adsorption and surface diffusion of methylphosphonic acid (MPA), as a model of glyphosate, on the (010) plane of goethite (GOT), one of the most important Fe(III) minerals in soils and sediments. In particular, the MPA adsorption was studied at the GOT–water interface, finding a strong covalent character in the bond. We also corroborated the occurrence of double proton transfer (MPA to GOT and GOT to GOT). Finally, activation energy barriers were calculated to estimate the half-lives for molecular diffusion, showing that MPA moves almost 3000 times slower than water at the GOT surface.

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“…The pseudo-second-order kinetic model is based on the adsorption rate-limiting step and contains the adsorption mechanism, such as chemisorption, which involves electron sharing or electron transfers between the adsorbate and the adsorbent [ 42 ]. The conformity to the pseudo-second-order kinetic model indicates that adsorption kinetics are mainly controlled by chemical interactions rather than by the material transport steps.…”

Section: Adsorption Mechanism and Kinetics Of Polysaccharide-based Hy...mentioning

confidence: 99%

Research Progress of Polysaccharide-Based Natural Polymer Hydrogels in Water Purification

Zhang

Yan

et al. 2023

Gels

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The pollution and scarcity of freshwater resources are global problems that have a significant influence on human life. It is very important to remove harmful substances in the water to realize the recycling of water resources. Hydrogels have recently attracted attention due to their special three-dimensional network structure, large surface area, and pores, which show great potential for the removal of pollutants in water. In their preparation, natural polymers are one of the preferred materials because of their wide availability, low cost, and easy thermal degradation. However, when it is directly used for adsorption, its performance is unsatisfactory, so it usually needs to be modified in the preparation process. This paper reviews the modification and adsorption properties of polysaccharide-based natural polymer hydrogels, such as cellulose, chitosan, starch, and sodium alginate, and discusses the effects of their types and structures on performance and recent technological advances.

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The two-species phosphate adsorption kinetics on goethite

Cited by 11 publications

References 18 publications

Goethite and Hematite Nucleation and Growth from Ferrihydrite: Effects of Oxyanion Surface Complexes

Goethite and Hematite Nucleation and Growth from Ferrihydrite: Effects of Oxyanion Surface Complexes

Electronic-Level Insight into the Adsorption and Surface Diffusion Kinetics of a Simplified Glyphosate Model on a Goethite Surface

Research Progress of Polysaccharide-Based Natural Polymer Hydrogels in Water Purification

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