Fluoride removal by Ca-Al-CO3 layered double hydroxides at environmentally-relevant concentrations

Wei, Liangfu; Zietzschmann, Frederik; Rietveld, L.C.; Halem, D. van

doi:10.1016/j.chemosphere.2019.125307

Cited by 46 publications

(16 citation statements)

References 59 publications

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“…Researchers have investigated various adsorbent materials for fluoride removal from an aqueous solution. Calcite [ 126 ], limestone [ 127 ], nanohydroxyapatite [ 128 , 129 , 130 , 131 , 132 , 133 , 134 ], montmorillonite [ 135 ], mixed metal oxides [ 136 ], activated carbon [ 137 ], activated alumina [ 138 ], layered double hydroxides [ 139 ], clays [ 140 ] and rare earths-loaded chitosan beads [ 141 ] are some of them. Among these adsorbents, nano HAp has attracted researchers’ interest due to its chemical composition, crystal structure, excellent defluoridation capacity, low cost and availability.…”

Section: Adsorption Of Fluoride Ions From Aqueous Solutionsmentioning

confidence: 99%

Applications of Nano Hydroxyapatite as Adsorbents: A Review

et al. 2022

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Nano hydroxyapatite (Ca10(PO4)6(OH)2, HAp) has aroused widespread attention as a green and environmentally friendly adsorbent due to its outstanding ability in removing heavy metal ions, radio nuclides, organic pollutants and fluoride ions for wastewater treatment. The hexagonal crystal structure of HAp supports the adsorption mechanisms including ionic exchange reaction, surface complexation, the co-precipitation of new partially soluble phases and physical adsorption such as electrostatic interaction and hydrogen bonding. However, nano HAp has some drawbacks such as agglomeration and a significant pressure drop during filtration when used in powder form. Therefore, instead of using nano HAp alone, researchers have worked on modificationsand composites of nano HAp to overcome these issues and enhance the adsorption capacity. The modification of cationic doping and organic molecule grafting for nano HAp can promote the immobilization of ions and then increase adsorption capacity. Developing nano HAp composite with biopolymers such as gelatin, chitosan and chitin has proven to obtain a synergetic effect for improving the adsorption capacity of composites, in which nano HAp fixed and dispersed in polymers can playmuch more of a role for adsorption. This review summarizes the adsorption properties and adsorbent applications of nano HAp as well as the methods to enhance the adsorption capacity of nano HAp.

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Section: Adsorption Of Fluoride Ions From Aqueous Solutionsmentioning

confidence: 99%

Applications of Nano Hydroxyapatite as Adsorbents: A Review

et al. 2022

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“…There have been full-fledged studies on the effects of the dosage of adsorbents, adsorption time, adsorption temperature, solution pH, co-existing anions and other factors on the removal of F À , as well as adsorption kinetics and thermodynamics. 15 However, experimental methods cannot fully reveal the adsorption mechanism of F À . If we can use computer molecular simulation technology to further study electron transfer and energy changes from the perspective of quantum mechanics and molecular dynamics, we can thoroughly understand the adsorption mechanism of F À on hydrotalcite, and provide reasonable prediction and guidance for the modification and adsorption of hydrotalcite-like materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental and DFT study of F⁻ removed by Cl⁻-hydrotalcite

Wang

et al. 2022

New J. Chem.

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“…Currently, commonly used fluoride removal technologies include adsorption, 17 precipitation, 18 membrane treatment, 19 ion exchange, 20 nano‐filtration, 21 electrocoagulation, 22 and membrane separation. The adsorption method has low price and good fluorine removal performance 23 …”

Section: Introductionmentioning

confidence: 99%

Study on the properties of bauxite modified by acid leaching and calcination for improving fluorine removal

Liu

Zhong

Zhu

et al. 2022

Asia-Pacific J Chem Eng

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In order to improve the fluorine removal performance of bauxite, the effects of different calcination temperatures and several acids (HCl, H 2 SO 4 , H 2 C 2 O 4 ) on the fluorine removal performance of bauxite were investigated. It was found that the calcination temperature of 500 C and the modification of H 2 SO 4 had the best fluorine removal performance. Under the same experimental conditions, the fluoride removal rate of the modified bauxite could reach 99.54%, which was much higher than that of unmodified bauxite (52.69%). The adsorbent was characterized by XRD, FTIR, BET, TG/DSC, and XRF. The influence of the addition amount of adsorbent, initial concentration of fluorine, adsorption time, and temperature on fluorine removal performance was studied. The adsorption process reached equilibrium in 32 min, and the inhibition order of coexisting anions was H 2 PO 4 À < HCO 3 À < CO 3 2À < Cl À . The pseudo-secondorder kinetic model was more suitable for the fluoride removal process of modified bauxite. Thermal regeneration had better regeneration performance than alkali leaching regeneration.

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Fluoride removal by Ca-Al-CO3 layered double hydroxides at environmentally-relevant concentrations

Cited by 46 publications

References 59 publications

Applications of Nano Hydroxyapatite as Adsorbents: A Review

Applications of Nano Hydroxyapatite as Adsorbents: A Review

Experimental and DFT study of F⁻ removed by Cl⁻-hydrotalcite

Study on the properties of bauxite modified by acid leaching and calcination for improving fluorine removal

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Fluoride removal by Ca-Al-CO3 layered double hydroxides at environmentally-relevant concentrations

Cited by 46 publications

References 59 publications

Applications of Nano Hydroxyapatite as Adsorbents: A Review

Applications of Nano Hydroxyapatite as Adsorbents: A Review

Experimental and DFT study of F− removed by Cl−-hydrotalcite

Study on the properties of bauxite modified by acid leaching and calcination for improving fluorine removal

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Experimental and DFT study of F⁻ removed by Cl⁻-hydrotalcite