Review of fluoride removal from water environment by adsorption

He, Jianming; Yang, Ya; Wu, Zijian; Xie, Chao; Zhang, Kaisheng; Kong, Lingtao; Liu, Jinhuai

doi:10.1016/j.jece.2020.104516

Cited by 180 publications

(68 citation statements)

References 224 publications

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“…Genotoxicity study. For detection of DNA damage, the single cell gel electrophoresis assay (Comet assay) was employed based on the method of Singh et al [2] with minor modi cations. Brie y, A549 cells were treated with different suspensions of the particles.…”

Section: Cyto-and Genotoxicity Of Sio 2 @Fe X O Y Particlesmentioning

confidence: 99%

“…Among them are the processes involving solid materials with su cient a nity for pollutants to reduce their water concentration down to harmless values [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Metal oxides have a high concentration of active functional groups on their surface, capable of removing pollutants from water [4]. Mesoporous shells (pores 2-50 nm) provide high surface areas (> 100 m 2 .g − 1 ) without the high toxicity of nanoparticles with similar surface areas and without the di culties of recovering nanoparticles from solution.…”

Section: Introductionmentioning

confidence: 99%

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Green chemical synthesis for well-defined and sharply distributed SiO2@FexOy particles

Leis

Leonel

Virgilio

et al. 2021

J Sol-Gel Sci Technol

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Using a non-toxic precursor, we created a green chemical synthesis for colloidal spheres with a core@shell structure having a silica core and an iron oxide shell (SiO 2 @Fe x O y ). Our synthesis pathway enabled an iron oxide shell formation with a 9 ± 6 nm thick shell onto colloidal silica spheres (ca. 700 nm).SiO 2 @Fe x O y particles reduced A549 cell viability and induced DNA damage. SiO 2 @Fe x O y particles showed the potential for removing uoride from water. HighlightsGreen chemical synthesis for monodisperse, spherical SiO 2 @Fe x O y particles.A 9 ± 6 nm thick shell of iron oxide formed onto monodisperse silica spheres.The presence of the shell reduced A549 cell viability and induced DNA damage.SiO 2 @Fe x O y particles removed uoride from water in batch systems.

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Section: Cyto-and Genotoxicity Of Sio 2 @Fe X O Y Particlesmentioning

confidence: 99%

“…Among them are the processes involving solid materials with su cient a nity for pollutants to reduce their water concentration down to harmless values [1,2].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Green chemical synthesis for well-defined and sharply distributed SiO2@FexOy particles

Leis

Leonel

Virgilio

et al. 2021

J Sol-Gel Sci Technol

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“…Such a process is also effective and works over an extensive range of pH values and lower residual concentrations in comparison to other methods [ 18 ]. For these reasons, a list of adsorbents was investigated to evaluate their possible use as de-fluoridating materials, including activated alumina, activated alumina coated silica gel, bone charcoal, tri-calcium phosphate, activated carbon, activated soil sorbent, calcite, activated coconut shell powder, activated sawdust, groundnut shell, serpentine, coffee husk, activated fly ash, metal-organic frameworks (MOFs), rice husk, magnesia, defluoron-1, defluoron-2, and so on [ 19 , 20 , 21 , 22 , 23 , 24 ]. In general, adsorptive fluoride removal can reach up to 90%, proving that adsorption is a highly efficient technique in this regard in addition to its cost-effectiveness and simplicity.…”

Section: Introductionmentioning

confidence: 99%

Efficient Fluoride Removal from Aqueous Solution Using Zirconium-Based Composite Nanofiber Membranes

et al. 2021

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Herein, composite nanofiber membranes (CNMs) derived from UiO-66 and UiO-66-NH2 Zr-metal-organic frameworks (MOFs) were successfully prepared, and they exhibited high performance in adsorptive fluoride removal from aqueous media. The resultant CNMs were confirmed using different techniques, such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Brunauer–Emmett–Teller (BET) in addition to Fourier-transform infrared spectroscopy (FTIR). The parameters that govern the fluoride adsorption were evaluated, including adsorbent dose, contact time, and pH value, in addition to initial concentration. The crystalline structures of CNMs exhibited high hydrothermal stability and remained intact after fluoride adsorption. It could also be observed that the adsorbent dose has a significant effect on fluoride removal at high alkaline values. The results show that UiO-66-NH2 CNM exhibited high fluoride removal due to electrostatic interactions that strongly existed between F− and metal sites in MOF in addition to hydrogen bonds formed with MOF amino groups. The fluoride removal efficiency reached 95% under optimal conditions of 20 mg L−1, pH of 8, and 40% adsorbent dose at 60 min. The results revealed that UiO-66-NH2 CNM possesses a high maximum adsorption capacity (95 mg L−1) over UiO-66 CNM (75 mg L−1), which exhibited better fitting with the pseudo-second-order model. Moreover, when the initial fluoride concentration increased from 20 to 100 mg/L, fluoride adsorption decreased by 57% (UiO-66 CNM) and 30% (UiO-66-NH2 CNM) after 60 min. After three cycles, CNM revealed the regeneration ability, demonstrating that UiO-66-NH2 CNMs are auspicious adsorbents for fluoride from an aqueous medium.

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“…자연적으로 지하수나 지표수에 존재하는 오염 원소는 통상적으로 그 지역의 지질학적 특성과 밀접한 관련이 있으며, 불소의 경우 해당 지역 지층에 포함된 불화인회 석(Ca 5 (PO 4 )F), 빙정석(Na 3 AlF 6 ), 형석(CaF 2 ) 등의 광물로 부터 용해되어 지표에서 검출된다는 보고가 있다 (He et al, 2020). 712 (Mall et al, 2006).…”

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A Study of Fluoride Adsorption in Aqueous Solution Using Iron Sludge based Adsorbent at Mine Drainage Treatment Facility

Lee

Kim

2021

Econ. Environ. Geol.

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In this study, an adsorbent prepared by natural drying of iron hydroxide-based sludge collected from settling basin at a mine drainage treatment facility located in Gangneung, Gangwon-do was used to remove fluoride in an artificial fluoride solution and mine drainage, and the adsorption characteristics of the adsorbent were investigated. As a result of analyzing the chemical composition, mineralogical properties, and specific surface area of the adsorbent used in the experiment, iron oxide (Fe 2 O 3 ) occupies 79.2 wt.% as the main constituent, and a peak related to calcite (CaCO 3 ) in the crystal structure analysis was analyzed. It was also identified that an irregular surface and a specific surface area of 216.78 m 2 •g -1 . In the indoor batch-type experiment, the effect of changes in reaction time, pH, initial fluoride concentration and temperature on the change in adsorption amount was analyzed. The adsorption of fluoride showed an adsorption amount of 3.85 mg•g -1 16 hours after the start of the reaction, and the increase rate of the adsorption amount gradually decreased. Also, as the pH increased, the amount of fluoride adsorption decreased, and in particular, the amount of fluoride adsorption decreased rapidly around pH 5.5, the point of zero charge at which the surface charge of the adsorbent changes. Meanwhile, the results of the isotherm adsorption experiment were applied to the Langmuir and Freundlich isotherm adsorption models to infer the fluoride adsorption mechanism of the used adsorbent. To understand the thermodynamic properties of the adsorbent using the Van't Hoff equation, thermodynamic constants ΔH o and ΔG o were calculated using the adsorption amount information obtained by increasing the temperature from 25 o C to 65 o C to determine the adsorption characteristics of the adsorbent. Finally, the adsorbent was applied to the mine drainage having a fluoride concentration of about 12.8 mg•L -1 , and the fluoride removal rate was about 50%.

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Review of fluoride removal from water environment by adsorption

Cited by 180 publications

References 224 publications

Green chemical synthesis for well-defined and sharply distributed SiO2@FexOy particles

Green chemical synthesis for well-defined and sharply distributed SiO2@FexOy particles

Efficient Fluoride Removal from Aqueous Solution Using Zirconium-Based Composite Nanofiber Membranes

A Study of Fluoride Adsorption in Aqueous Solution Using Iron Sludge based Adsorbent at Mine Drainage Treatment Facility

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