Removal of fluoride ions from aqueous solution by waste mud

Kemer, Barış; Özdeş, Duygu; Gündoğdu, Ali; Bulut, Volkan Numan; Duran, Celal; Soylak, Mustafa

doi:10.1016/j.jhazmat.2009.02.109

Cited by 117 publications

(52 citation statements)

References 26 publications

(27 reference statements)

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“…Anions such as sulfate, nitrate, carbonate, chloride, bicarbonate, and phosphate influence adsorption by adjustment of the electrostatic charge at the solid surface because of the same negative ions [11,[56][57][58][59][60][61]. The effects of anions on fluoride removal were reported by [40,[62][63][64][65][66]. Both direct and indirect effects of these anions are influenced by pH, anions' concentrations, and intrinsic binding affinities [42,59].…”

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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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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“…In these tests, 200 mL of a synthetic fluoride aqueous solution with a concentration of 3.9 mg/L was mixed with 10 g of the homemade bone char in a plastic bottle and then shaken in a water bath at room temperature. Samples were collected and analyzed at 2,4,6,8,10,12,16,20, and 24 hours. Sorption kinetics and isotherms for each size of bone char were then analyzed.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, many attempts have been made to use waste or low cost materials as the absorbent. The materials studied include bauxite [13], montmorillonite [14], activated water treatment sludge [15], waste mud [16], red mud [17], granular ceramic [18], hydrous iron (III)-tin (IV) mixed oxide [19], and schwertmannite [20].…”

Section: Introductionmentioning

confidence: 99%

Defluoridation with Locally Produced Thai Bone Char

Mutchimadilok

Smittakorn

Mongkolnchai-arunya

et al. 2014

Advances in Environmental Chemistry

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The fluoride sorption ability of a locally available bone char is quantified. Both a synthetic solution and natural groundwater samples from several sites are studied and compared to Indian bone char, which is widely accepted and used successfully in India and elsewhere. The Freundlich and Langmuir sorption isotherms were used to quantify sorption properties. Results show that the Thai bone char is as effective as the Indian bone char for removing fluoride from contaminated water, despite the more rigid physical and social constraints found in rural Thailand. Sorption studies with fluoride-contaminated natural groundwater samples also show that chlorides, nitrates, and sulfates had little effect on the removal of fluoride by the homemade bone char.

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“…Besides adsorption at the outer surface of the adsorbent, the fluoride may also diffuse into the interior of the adsorbent (Kemer et al 2009). The intraparticle diffusion model (Eq.…”

Section: Intraparticle Diffusion Of Fluoridementioning

confidence: 99%

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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Removal of fluoride ions from aqueous solution by waste mud

Cited by 117 publications

References 26 publications

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

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

Defluoridation with Locally Produced Thai Bone Char

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

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