Stabilization of soil arsenic by natural limonite after mechanical activation and the associated mechanisms

Yan, Xiulan; Shao, Jinqiu; Wen, Qiqian; Shen, Jian

doi:10.1016/j.scitotenv.2019.135118

Cited by 18 publications

(5 citation statements)

References 35 publications

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“…(2010) employed three Fe-containing materials, i.e., nanoscale zerovalent Fe, iron sulfide, and magnetite, for soil treatment, and found an increase in the soil pH by ~0.5 units. This was attributed to the hydrolysis reaction of magnetite in the environment that resulted in the release of OH - (Wu et al, 2015;Yan et al, 2020a). Unexpectedly, the variation in the dosage of Mm exerted a negligible effect on the soil pH.…”

Section: Arsenic Stability In the Natural And Ball-milled Magnetite-a...mentioning

confidence: 99%

Ball-milled magnetite for efficient arsenic decontamination: Insights into oxidation–adsorption mechanism

Yang

Liu

Liang

et al. 2022

Journal of Hazardous Materials

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Section: Arsenic Stability In the Natural And Ball-milled Magnetite-a...mentioning

confidence: 99%

Ball-milled magnetite for efficient arsenic decontamination: Insights into oxidation–adsorption mechanism

Yang

Liu

Liang

et al. 2022

Journal of Hazardous Materials

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“…To address these technical challenges, our group suggested a practical approach, which involves shaping new fibrous adsorbents consisting of polymer-limonite composites that use limonite as a rich goethite material through the wet-spinning technique for the decontamination of As ions from aqueous solutions. The mineralogical phases of natural iron exhibit significant adsorption ability, making them suitable for As removal from aqueous solutions (Yan et al, 2020). However, only limited information about the elimination of such powdery limonite and few studies of limonite composites have been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Arsenic removal adsorbent using limonite–polyethersulfone composite fiber via continuous flow column process

Le Thi,

Zhe,

Kobayashi

2024

Water Environment Research

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This research introduces an enhanced limonite‐based composite fiber adsorbent for arsenic (As) removal. The modification involves creating polyethersulfone (PES)–limonite composite fibers loaded with 60 wt% limonite powders, designed to be applicable in water flow environments. The fibers were prepared using a wet‐spinning process based on phase inversion, with varying concentrations (10, 20, and 30 wt%) of PES in NMP solution. The composite fiber with 10 wt% NMP exhibited a porous structure and demonstrated efficient absorption of both As(III) and As(V). Adsorption followed the Langmuir model, with qm values of 1.5 mg/g for As(III) and 3.2 mg/g for As(V) at pH 6. In column experiments, As removal rates increased with contact time, attributed to decreased flow rates (1 mL/min). Moreover, increasing fiber column height led to enhanced removal rates, as indicated by the Adams–Bohart model. The mechanism for As(V) removal involved the formation of an inner‐sphere complex through ion exchange between α‐FeOOH and HAsO4− and H2AsO42− in an aqueous solution at pH 6.8.Practitioner Points Changing the polyethersulfone ratio in the composite leads to variations in the appearance of limonite within each composite fiber. Limonite composite fibers effectively remove As(III) and As(V) at neutral pH. The adsorption behavior follows Langmuir kinetic model, the qm of 1.5 mg/g for As(III) and 3.2 mg/g for As(V). Longer columns and contact times enhance arsenic (As) removal in practical water treatment systems. Adam–Bohart model aids in predicting breakthrough and saturation time in As adsorption column design.

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“…1,2 This work is focused on goethite, which is also the key component mineral of limonite. 3,4 For the purification of goethite, researchers have conducted extensive experimental studies, 2,5−7 which is of great significance to promote the development of the iron and steel industry.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The main occurrence mineral of iron is the oxidized mineral. With the exploitation of iron ore resources, high-quality and easily beneficiated magnetite and hematite resources are gradually exhausted, and refractory oxidized iron ores such as goethite and limonite have increasingly become important iron ore resources in China. , This work is focused on goethite, which is also the key component mineral of limonite. , For the purification of goethite, researchers have conducted extensive experimental studies, ,− which is of great significance to promote the development of the iron and steel industry.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Goethite Surface Hydration Microstructure on the Adsorption of the Collectors Dodecylamine and Sodium Oleate

et al. 2021

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Dodecylamine (DDA) and sodium oleate (OL) are commonly used collectors in the reverse flotation and the direct flotation of goethite. However, the flotation mechanisms of DDA and OL on the goethite surface remain unclear. In this study, the first-principles density functional theory calculations were used to reveal the role of the hydration of the goethite surface and its effects on flotation reagents from a microscopic perspective. The calculation results showed that DDA was adsorbed on the surface of goethite by hydrogen bonds in the absence of hydration. However, the existence of the hydration microstructure hindered the formation of hydrogen bonds and made it difficult for DDA to be adsorbed on the goethite surface. In the OL system, oleate ions are chemically adsorbed on the surface Fe sites of goethite in the absence of hydration, while in the presence of hydration, the oleate ions were adsorbed on the H-terminal hydration surface of goethite by hydrogen bonds. This work sheds new light on the roles of the hydration microstructure and the adsorption mechanism of the flotation reagent on the oxide minerals.

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Stabilization of soil arsenic by natural limonite after mechanical activation and the associated mechanisms

Cited by 18 publications

References 35 publications

Ball-milled magnetite for efficient arsenic decontamination: Insights into oxidation–adsorption mechanism

Ball-milled magnetite for efficient arsenic decontamination: Insights into oxidation–adsorption mechanism

Arsenic removal adsorbent using limonite–polyethersulfone composite fiber via continuous flow column process

Effects of the Goethite Surface Hydration Microstructure on the Adsorption of the Collectors Dodecylamine and Sodium Oleate

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