Adsorption of fluoride at the interface of water with calcined magnesium–ferri–lanthanum hydrotalcite-like compound

Wu, Peng; Wu, Jishan; Xia, Ling; Liu, Yao; Xu, Lili; Song, Shaoxian

doi:10.1039/c7ra04382a

Cited by 29 publications

(17 citation statements)

References 42 publications

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“…38 Anion exchange behaviour refers to any ions with negatively charged ions that can be exchanged stoichiometrically with similarly charged ions in the aqueous phase of a chemical process. 39 The unique anion-exchange mechanism of MOF-801 can be attributed to the isoelectronic and comparable ionic radii between hydroxyl and uoride ion, and by the electrostatic interaction between zirconium cation and uoride ion as shown in eqn (8) below.…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Adsorptive, kinetics and regeneration studies of fluoride removal from water using zirconium-based metal organic frameworks

et al. 2020

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Section: Adsorption Mechanismmentioning

confidence: 99%

Adsorptive, kinetics and regeneration studies of fluoride removal from water using zirconium-based metal organic frameworks

et al. 2020

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“…There are two common types of multi-metal oxide adsorbents. One is prepared by compounding each metal element in a certain ratio ( Wu K. et al, 2017 ) such as layered double/triple hydroxides ( Wu P. et al, 2017 ), and the other is to modify one metal oxide with others; the ones mostly reported are modified alumina ( He et al, 2019 ) or magnetic iron oxides.…”

Section: New Composite Adsorbents Obtained From Metal Modificationmentioning

confidence: 99%

“…The addition of rare earth metals has been reported to further enhance the affinity with fluoride. Wu P. et al (2017 ) introduced La into Mg/Fe LDH to form Mg/Fe/La hydrotalcite-like compounds with layered porous structure, which significantly enhanced the fluoride adsorption capacity of Mg/Fe LDH.…”

Section: New Composite Adsorbents Obtained From Metal Modificationmentioning

confidence: 99%

Synergistic Fluoride Adsorption by Composite Adsorbents Synthesized From Different Types of Materials—A Review

Wei

Wang

et al. 2022

Front. Chem.

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The reduction of fluoride concentrations in water is one of many concerns. Adsorption is the most widely used technology for fluoride removal and the center to development of adsorption technology is the improvement of adsorbents. This review classifies the typical fluoride removal adsorbents into four types: metal oxides/hydroxides, biopolymers, carbon-based, and other adsorbents. The exploitation of new materials and the synthesis of composite materials are two ways of developing new adsorbents. In comparison to the discovery of novel adsorbents for fluoride adsorption, research into the composite synthesis of different types of conventional adsorbents has proliferated in recent years. The traditional adsorbents used the earliest, metal oxides, can act as active centers in a wide range of applications for modifying and compounding with other types of adsorbents. This study emphasizes reviewing the research on fluoride removal by composite adsorbents synthesized from different types of metal-modified materials. Seven factors were compared in terms of material characterization, initial fluoride concentration, adsorbent dose, pH, temperature, reaction time, and maximum adsorption capacity. The modification of composite adsorbents is facile and the synergistic effect of the different types of adsorbents significantly improves fluoride adsorption capacity. Metal composite adsorbents are synthesized by facile coprecipitation, hydrothermal, or impregnation modification methods. The adsorption mechanisms involve electrostatic attraction, ion exchange, complexation, and hydrogen bonding. The fluoride adsorption capacity of composite adsorbents has generally improved, indicating that most modifications are successful and have application prospects. However, to achieve significant breakthroughs in practical applications, numerous issues such as cost, separation/regeneration performance, and safety still need to be considered.

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“…A small amount of fluorine is absorbed to enhance bone hardness, but excessive intake can cause bone fluorosis, which can even be life-threatening in severe cases. 4 Iron is an essential trace element for the human body. Iron ions participate in the transport of oxygen required by the human body.…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization serpentine-loaded hydroxyapatite and its simultaneous removal performance for fluoride, iron and manganese

Liu

et al. 2021

RSC Adv.

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Adsorption of fluoride at the interface of water with calcined magnesium–ferri–lanthanum hydrotalcite-like compound

Abstract: A new calcined Mg/Fe/La hydrotalcite-like compound was prepared and showed a good performance for fluoride adsorption. The “memory effect” of the adsorbent and lanthanum played a great role for fluoride adsorption.

Cited by 29 publications

References 42 publications

Adsorptive, kinetics and regeneration studies of fluoride removal from water using zirconium-based metal organic frameworks

Adsorptive, kinetics and regeneration studies of fluoride removal from water using zirconium-based metal organic frameworks

Synergistic Fluoride Adsorption by Composite Adsorbents Synthesized From Different Types of Materials—A Review

Preparation, characterization serpentine-loaded hydroxyapatite and its simultaneous removal performance for fluoride, iron and manganese

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