A Mini Review of Recent Findings in Cellulose-, Polymer- and Graphene-Based Membranes for Fluoride Removal from Drinking Water

Tolkou, Athanasia K.; Meez, Elie; Kyzas, George Z.; Torretta, Vincenzo; Collivignarelli, Maria Cristina; Caccamo, Francesca Maria; Deliyanni, Eleni A.; Katsoyiannis, Ioannis A.

doi:10.3390/c7040074

Cited by 9 publications

(4 citation statements)

References 83 publications

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“…Efficacy influenced by materials used, with compliance to EPA's limit of less than 4 mg/L of fluoride in treated water [7]. Photocatalytic nanoparticles, like titanium dioxide, zinc oxide, and zinc sulfide [92].…”

Section: Photocatalysismentioning

confidence: 99%

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Approaches for the Efficient Removal of Fluoride from Groundwater: A Comprehensive Review

Arab,

Derakhshani,

Sayadi

2024

Toxics

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Contamination of groundwater with fluoride represents a significant global issue, with high concentrations posing serious public health threats. While fluoride is a critical element in water, excessive levels can be detrimental to human health and potentially life-threatening. Addressing the challenge of removing fluoride from underground water sources via nanotechnological approaches is a pressing concern in environmental science. To collate relevant information, extensive literature searches were conducted across multiple databases, including Google Scholar, PubMed, Scopus, Web of Science, the American Chemical Society, Elsevier, Springer, and the Royal Society of Chemistry. VOS Viewer software version 1.6.20 was employed for a systematic review. This article delivers an exhaustive evaluation of various groundwater fluoride removal techniques, such as adsorption, membrane filtration, electrocoagulation, photocatalysis, and ion exchange. Among these, the application of nanoparticles emerges as a notable method. The article delves into nano-compounds, optimizing conditions for the fluoride removal process and benchmarking their efficacy against other techniques. Studies demonstrate that advanced nanotechnologies—owing to their rapid reaction times and potent oxidation capabilities—can remove fluoride effectively. The implementation of nanotechnologies in fluoride removal not only enhances water quality but also contributes to the safeguarding of human health.

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Section: Photocatalysismentioning

confidence: 99%

“…Furthermore, a reduction in fluoride levels can weaken resistance to bacterial infections. In certain cases, drinking water with insufficient fluoride may lead to the emergence of fluoride-associated diseases, including fluorosis, periodontitis, and even cancer [7].…”

Section: Introductionmentioning

confidence: 99%

Approaches for the Efficient Removal of Fluoride from Groundwater: A Comprehensive Review

Arab,

Derakhshani,

Sayadi

2024

Toxics

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“…Several treatment methods, such as precipitation [7][8][9], reverse osmosis [10], membrane separation [11][12][13], coagulation [14], etc., are commonly used to remove fluoride anions from water. However, the disadvantages of these technologies are that they have high costs and require expensive operational and labor costs and advanced technologies.…”

Section: Introductionmentioning

confidence: 99%

Fluoride Removal from Water Sources by Adsorption on MOFs

Tolkou,

Zouboulis

2023

Separations

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Fluoride is present in several groundwaters due to natural or anthropogenic origins. Although it is necessary for physiological human functions (in small amounts, i.e., 0.5–1.2 mg/L), it could be very harmful when it exceeds the maximum permissible concentration limit of 1.5 mg/L (according to WHO). Among the numerous technologies for removing fluoride from waters, metal–organic framework (MOF) materials are considered to be promising adsorbents due to their advantages of high porosity, high specific surface area, diverse functions and easy modification. In this study, the synthesis of MOFs and the progress of their application to the removal of fluoride from contaminated water, as published in the recent literature mainly over the past five years, are reviewed. The adsorption mechanism(s) and its main characteristics, such as effect of initial fluoride concentration, adsorbent dosage, solution pH, contact time, adsorption capacity, thermodynamic and regeneration studies, etc., for the removal of fluoride with the addition of different MOFs are compared. According to these comparisons, the hydrothermal/solvothermal synthesis method is most commonly used for the preparation of MOFs, whereas higher BET surface areas are shown by specific MOFs based on aluminum metal ions. The main fluoride adsorption mechanisms were found to be electrostatic attraction and/or complexation. The most common pH for conducting experiments was 7.0, but several examined materials were found to be effective over a wide pH range. Four to six regeneration cycles were successfully applied on average, regarding the MOFs under review, whereas in the majority of these cases, the sorption process was found to be endothermic.

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“…Various technologies have been developed for the removal of As and F in order to achieve these permissible limits [14][15][16][17][18], and among them, adsorption with modified activated carbons [19,20] is a very promising and widely applied technique [21,22]. However, several studies [12,17,23] have been carried out to investigate the simultaneous removal of arsenic and fluoride, and a reduction in the removal efficiency of one of the two pollutants is generally observed.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal of As(III) and Fluoride Ions from Water Using Manganese Oxide Supported on Graphene Nanostructures (GO-MnO2)

et al. 2023

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In the present research, the use of manganese oxides supported on graphene nanostructures (GO-MnO2), which support the synergistic action of adsorption and oxidation, in the combined removal of arsenic and fluoride from drinking water was studied. The simultaneous occurrence of fluoride and arsenic in groundwater is one of the major environmental problems, occurring mainly in anhydrous regions of Latin America and the world. These pollutants cause significant health problems and are difficult to remove simultaneously from drinking water. The structure of GO-MnO2 was characterized by the application of FTIR, EDS and SEM techniques. The effects of the adsorbent’s dosage, the pH value, the contact time and the initial concentrations of As(III) and F ions (F−) were examined with respect to the removal of As(III) and F ions. According to the results, the presence of arsenic enhances fluoride removal with increasing arsenic concentrations, and the presence of fluoride enhances arsenic removal with increasing fluoride concentrations, mainly at a neutral pH value. The co-presence removal efficiencies were 89% (a residual concentration of 1.04 mg/L) for fluoride and about 97% (a residual concentration of 2.89 μg/L) for arsenic.

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A Mini Review of Recent Findings in Cellulose-, Polymer- and Graphene-Based Membranes for Fluoride Removal from Drinking Water

Cited by 9 publications

References 83 publications

Approaches for the Efficient Removal of Fluoride from Groundwater: A Comprehensive Review

Approaches for the Efficient Removal of Fluoride from Groundwater: A Comprehensive Review

Fluoride Removal from Water Sources by Adsorption on MOFs

Simultaneous Removal of As(III) and Fluoride Ions from Water Using Manganese Oxide Supported on Graphene Nanostructures (GO-MnO2)

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