Essence of hydroxyapatite in defluoridation of drinking water: A review

Rathnayake, Anushka; Hettithanthri, Oshadi; Mahatantila, Kushani; Rajapaksha, Anushka Upamali; Vithanage, Meththika

doi:10.1016/j.envpol.2022.119882

Cited by 14 publications

(3 citation statements)

References 106 publications

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“…It is a major component of bones and teeth. Due to its strong adsorption and ion exchange capabilities and good stability in water, HAP can be widely used as an eco-friendly material in water treatment (He et al 2016;Rathnayake et al 2022). HAP has a certain capacity for removing fluoride from water, primarily through ion exchange and electrostatic interactions, with reactions primarily occurring on the crystal surface.…”

Section: Introductionmentioning

confidence: 99%

Fluoride removal by hydroxyapatite modified with anhydrous aluminum chloride

Ren,

Jia,

Huang

et al. 2024

Water Supply

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Efficient and low-cost removal of fluoride from water has attracted wide attention. Here, aluminum-modified hydroxyapatite (Al-HAP) was prepared by a homogeneous hydrothermal co-precipitation method. The physicochemical properties of the Al-HAP surface were characterized by SEM, XRD, FT-IR, BET, and zeta potential, and the adsorption performances were evaluated. It showed that Al-HAP has a larger specific surface area (121.97 m2/g, which is 2.3 times larger than that of HAP), more surface-active hydroxyls and positively charged at pH less than 7, which indicate that Al-HAP is beneficial to the adsorption of negatively charged fluoride. Al-HAP had a higher fluoride adsorption capacity (56.44 mg/g) than that of HAP (28.36 mg/g), and not sensitive to the interference of coexisting ions except CO32-. Based on the adsorption kinetics and adsorption isotherm experiments, the proposed two-stage kinetic model and Freundlich isotherm model can better describe the adsorption process. From the results of XPS and FT-IR, it indicated that the ion exchange between hydroxyl group on the surface and fluoride ions is the main driven force for the adsorption, and electrostatic adsorption is also helpful. The present study provides an improved HAP to effectively remove fluoride from water.

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Section: Introductionmentioning

confidence: 99%

Fluoride removal by hydroxyapatite modified with anhydrous aluminum chloride

Ren,

Jia,

Huang

et al. 2024

Water Supply

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“…Nevertheless, the release of wastewater from metallurgical and semiconductor industries, the natural degradation of fluoride-containing minerals, and the application of pesticides and fertilizers in agricultural production can lead to fluoride contamination in water bodies [3][4][5][6]. According to relevant studies, the water environment of most countries in the Americas, Asia, and Africa has serious fluoride pollution [7][8][9][10], posing a serious threat to human health. The World Health Organization limits the maximum amount of fluoride ions in drinking water to 1.5 mg/L to avoid the harm caused by fluoride in water [11,12].…”

Section: Introductionmentioning

confidence: 99%

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation

Xie,

Xiao,

Huang

et al. 2024

Nanomaterials

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In recent years, fluoride pollution in water is a problem that has attracted much attention from researchers. The removal of fluoride-containing wastewater by adsorption with metal oxide as an adsorbent is the most common treatment method. Based on this, the effect of the doping ratio of La2O3, Fe2O3, and Al2O3 on the fluoride-removal performance was discussed by constructing a phase diagram. In this study, the adsorption mechanism of nanocrystalline lanthanum oxide terpolymer was investigated by density functional theory calculation and experiment. The optimal pH condition selected in the experiment was three, and the adsorption kinetics of fluoride ions were more consistent with the quasi-second-order kinetic model. The adsorption thermodynamics was more consistent with the Langmuir model. When the La-Fe-Al ternary composite oxides achieved the optimal adsorption efficiency for fluoride ions, the mass synthesis ratio was Al2O3:(Fe2O3:La2O3 = 1:2) = 1:100, resulting in a fluoride ion removal rate of up to 99.78%. Density functional calculations revealed that the La-Fe-Al ternary composite oxides had three important adsorption sites for La, Fe, and Al. Among them, the adsorption capacity for HF was Fe2O3 > La2O3 > Al2O3, and for F− was La2O3 > Al2O3 > Fe2O3. This provided good guidance for designing adsorbents to remove fluoride.

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“…Specifically, an appropriate adsorbent should possess high adsorption efficiency, a fast adsorption rate, excellent water stability and mechanical strength, high selectivity for fluoride, and easy production; furthermore, it should fulfil economic and environmental requirements. Several types of adsorbents have been exploited for F − elimination, such as zeolite, hydroxyapatite, biochar, bentonite, metal-organic frameworks (MOFs), and layered double hydroxides [13][14][15][16][17][18]. However, most of these adsorbents suffer from low adsorption capacity, poor selectivity, and high treatment costs; thus, the development of superior adsorbents still constitutes an important yet challenging task.…”

Section: Introductionmentioning

confidence: 99%

Performance of Rod-Shaped Ce Metal–Organic Frameworks for Defluoridation

et al. 2023

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The performance of a Ce(III)-4,4′,4″-((1,3,5-triazine-2,4,6-triyl) tris (azanediyl)) tribenzoic acid–organic framework (Ce-H3TATAB-MOFs) for capturing excess fluoride in aqueous solutions and its subsequent defluoridation was investigated in depth. The optimal sorption capacity was obtained with a metal/organic ligand molar ratio of 1:1. The morphological characteristics, crystalline shape, functional groups, and pore structure of the material were analyzed via SEM, XRD, FTIR, XPS, and N2 adsorption–desorption experiments, and the thermodynamics, kinetics, and adsorption mechanism were elucidated. The influence of pH and co-existing ions for defluoridation performance were also sought. The results show that Ce-H3TATAB-MOFs is a mesoporous material with good crystallinity, and that quasi-second kinetic and Langmuir models can describe the sorption kinetics and thermodynamics well, demonstrating that the entire sorption process is a monolayer-governed chemisorption. The Langmuir maximum sorption capacity was 129.7 mg g−1 at 318 K (pH = 4). The adsorption mechanism involves ligand exchange, electrostatic interaction, and surface complexation. The best removal effect was reached at pH 4, and a removal effectiveness of 76.57% was obtained under strongly alkaline conditions (pH 10), indicating that the adsorbent has a wide range of applications. Ionic interference experiments showed that the presence of PO43− and H2PO4− in water have an inhibitory effect on defluoridation, whereas SO42−, Cl−, CO32−, and NO3− are conducive to the adsorption of fluoride due to the ionic effect.

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Essence of hydroxyapatite in defluoridation of drinking water: A review

Cited by 14 publications

References 106 publications

Fluoride removal by hydroxyapatite modified with anhydrous aluminum chloride

Fluoride removal by hydroxyapatite modified with anhydrous aluminum chloride

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation

Performance of Rod-Shaped Ce Metal–Organic Frameworks for Defluoridation

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