A critical study on efficiency of different materials for fluoride removal from aqueous media

Tomar, Vandana; Kumar, Dinesh

doi:10.1186/1752-153x-7-51

Cited by 111 publications

(36 citation statements)

References 119 publications

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“…It is indicated that iron is superior to other adsorbents for removal of F À (Qiao et al 2014) and a mixture of metallic oxides enhances F À adsorption (Tomar and Kumar 2013). The results revealed that iron ore contains relatively high iron and silicon oxides.…”

Section: Characterization Of the Adsorbentmentioning

confidence: 72%

“…In recent years, scientists suggested composite metal oxide as effective adsorbent for fluoride removal (Tchomgui-Kamga et al 2010a;Sun et al 2011;Tomar and Kumar 2013) and the U.S. Patent Trademark Office approved such novel approaches (Yang et al 2010). Iron ore is a mixture of different metal oxides responsible for the removal of fluoride and is one of the most abundant and cheap materials available anywhere in the Rift Valley.…”

Section: Introductionmentioning

confidence: 99%

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Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

et al. 2014

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High concentrations of fluoride in drinking water is a public health concern globally and of critical importance in the Rift Valley region. As a low-cost water treatment option, the defluoridation capacity of locally available iron ore was investigated. Residence time, pH, agitation rate, particle size of the adsorbent, sorbent dose, initial fluoride concentration and the effect of co-existing anions were assessed. The sorption kinetics was found to follow pseudo-first-order rate and the experimental equilibrium sorption data fitted reasonably well to the Freundlich model. The sorption capacity of iron ore for fluoride was 1.72 mg/g and the equilibrium was attained after 120 min at the optimum pH of 6. The sorption study was also carried out at natural pH conditions using natural ground water samples and the fluoride level was reduced from 14.22 to 1.17 mg/L (below the WHO maximum permissible limit). Overall, we concluded that iron ore can be used in water treatment for fluoride removal in the Rift Valley region and beyond.

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Section: Characterization Of the Adsorbentmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

et al. 2014

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“…The control of chemical and physical oxygen functional groups considerably affects their performance on the adsorption process [47]. However, the use of Extended X-ray Absorption Fine Structure (EXAFS), Fourier transform infrared spectroscopy (FTIR), and X-ray absorption near edge structure (XANES) has been employed for the removal of fluoride [48] and arsenic [49] to further study the adsorption mechanism and involvement of functional groups in different adsorbents. These have revealed the involvement of functional groups like hydroxyl and carbonates in the surface, which participate in the adsorption.…”

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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“…It exists as a diatomic molecule with remarkably low dissociation energy (38 kcal/mol). Fluoride is a persistent and non-biodegradable pollutant that accumulates in soil, plants, wildlife and human beings (Tomar and Kumar 2013). In soil fluoride presents as earth crust (0.6-0.9 %) commonly associated with volcanic activity and gases.…”

Section: Introductionmentioning

confidence: 99%

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Bhaumik

Mondal

2014

Appl Water Sci

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The present work highlighted the effective application of banana peel dust (BPD) for removal of fluoride (F -) from aqueous solution. The effects of operating parameters such as pH, initial concentration, adsorbent dose, contact time, agitation speed and temperature were analysed using response surface methodology. The significance of independent variables and their interactions were tested by the analysis of variance and t test statistics. Experimental results revealed that BPD has higher Fadsorption capacity (17.43, 26.31 and 39.5 mg/g). Fluoride adsorption kinetics followed pseudo-second-order model with high correlation of coefficient value (0.998). On the other hand, thermodynamic data suggest that adsorption is favoured at lower temperature, exothermic in nature and enthalpy driven. The adsorbents were characterised through scanning electron microscope, Fourier transform infrared spectroscopy and point of zero charges (pH ZPC ) ranges from pH 6.2-8.2. Finally, error analysis clearly demonstrates that all three adsorbents are well fitted with Langmuir isotherm compared to the other isotherm models. The reusable properties of the material support further development for commercial application purpose.

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A critical study on efficiency of different materials for fluoride removal from aqueous media

Cited by 111 publications

References 119 publications

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

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