Simultaneous Removal of Arsenate and Fluoride Using Magnesium-Based Adsorbents

Sugita, Hajime; Morimoto, Kazuya; Saito, Takeshi; Hara, Junko

doi:10.3390/su16051774

Cited by 6 publications

(1 citation statement)

References 27 publications

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“…Mg(OH) 2 is a pivotal inorganic compound with widespread applications across several domains, including wastewater treatment, insulation, flue gas desulfurization, and medicine, owing to its notable properties [1][2][3][4][5]. Distinguished from traditional halogenbased flame retardants, Mg(OH) 2 emerges as a non-toxic, eco-friendly alternative, offering high thermal stability, smoke suppression, and environmental safety [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Crystallization Growth Characteristics of Mg(OH)2 Crystals under Unconstrained Conditions

Lv,

Bai,

et al. 2024

Materials

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Utilizing MgO as the precursor and deionized water as the solvent, this study synthesized nanoparticles of Mg(OH)2 via hydrothermal methods, aiming to control its purity, particle size, and morphology by understanding its growth under non-uniform nucleation. Characterization of crystal morphology and structure was conducted through scanning electron microscopy and X-ray diffraction, while laser particle size detection assessed the secondary particle size distribution. The study focused on how MgO’s hydrothermal process conditions influence Mg(OH)2 crystal growth, particularly through ion concentration and release rate adjustments to direct crystal growth facets. These adjustments shifted the dominant growth plane, enhancing the peak intensity ratio I001/I101 from 1.03 to 2.14, thereby reducing surface polarity and secondary aggregation of crystals. The study of the physicochemical properties of the same sample at different times revealed the pattern of crystal dissolution and recrystallization. A 2 h hydrothermal reaction notably altered the particle size distribution, with a decrease in particles sized 0.2~0.4 μm and an increase in those sized 0.4~0.6 μm, alongside new particles over 1 μm, indicating a shift toward uniformity through dissolution and recrystallization. Optimal conditions (6% magnesium oxide concentration, 160 °C, 2 h) led to the synthesis of highly dispersed, uniformly sized magnesium hydroxide, showcasing a simple, eco-friendly, and high-yield process.

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Section: Introductionmentioning

confidence: 99%

Investigation of Crystallization Growth Characteristics of Mg(OH)2 Crystals under Unconstrained Conditions

Lv,

Bai,

et al. 2024

Materials

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Arsenic and fluoride adsorption from multielement solutions onto aluminium modified montmorillonite

Marco-Brown,

Melotta,

Fernández

et al. 2024

Groundwater for Sustainable Development

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Removal performance and adsorption behaviour on Mg-based adsorbents in As(III) and F simultaneous removal as in comparison with As(V)

Sugita,

Morimoto,

Saito

et al. 2024

GEEA

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In this study, simultaneous removal tests (fixed initial As concentration of 1 mg/L) for As(III) and F were performed using three types of Mg-based adsorbents. Their As(III) removal performance was in the order of MgCO 3 << Mg(OH) 2 < MgO. MgO met the environmental standards for As (0.01 mg/L) at initial F concentrations ( C F0 ) of 15 and 30 mg/L. MgO and Mg(OH) 2 met the As effluent standard (0.1 mg/L) even at C F0 = 60 mg/L. In contrast, MgCO 3 did not meet the effluent standards under the test conditions. The F removal performance of the Mg-based adsorbents followed the order of MgCO 3 < Mg(OH) 2 < MgO. MgO and Mg(OH) 2 met the environmental standard of F (0.8 mg/L), whereas MgCO 3 met the effluent standards for F in non-marine areas (8 mg/L) at C F0 = 15 and 30 mg/L, and in marine areas (15 mg/L) even at C F0 = 60 mg/L. The As(III) adsorption data fit the Langmuir model for MgO and the Freundlich model for MgO and Mg(OH) 2 , but not MgCO 3 for either model. Notably, the As(III) adsorption behavior of MgO was strongly influenced by C F0 . Meanwhile, the F adsorption data fit both the Langmuir and Freundlich models for all Mg-based adsorbents.

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Simultaneous Removal of Arsenate and Fluoride Using Magnesium-Based Adsorbents

Cited by 6 publications

References 27 publications

Investigation of Crystallization Growth Characteristics of Mg(OH)2 Crystals under Unconstrained Conditions

Investigation of Crystallization Growth Characteristics of Mg(OH)2 Crystals under Unconstrained Conditions

Arsenic and fluoride adsorption from multielement solutions onto aluminium modified montmorillonite

Removal performance and adsorption behaviour on Mg-based adsorbents in As(III) and F simultaneous removal as in comparison with As(V)

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