Experimental sorption of fluoride by kaolinite and bentonite

Kau, P.M.H.; Smith, David W.; Binning, Philip John

doi:10.1016/s0016-7061(97)00122-5

Cited by 70 publications

(40 citation statements)

References 21 publications

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“…De plus, il a été montré qu'un prétraitement thermique ou chimique augmentait la capacité d'adsorption de différentes argiles (Gonzalez-Pradas et al, 1994 ;Seghaïri et al, 2004). L'utilisation d'argiles (tel que la bentonite et la kaolinite) ou de sols argileux en vue de la défluoruration des eaux a été également testée dans quelques pays, où les eaux de consommation présentent un excès en ions fluorures (Kau et al, 1998 ;Srimurali et al, 1998;Puka, 2004).…”

Section: Défluoruration Par Adsorption Sur La Bentonite De Maghniaunclassified

“…Ces rendements augmentent progressivement jusqu'à un optimum puis diminuent audelà d'un temps de 3 h. De plus, la bentonite de Maghnia, même à l'état brut, présente une capacité d'adsorption non négligeable, notamment pour les eaux les plus chargées en fluor (Karma et Bordj). Divers travaux (Kau et al, 1998 ;Srimurali et al,1998) ont montré que la bentonite naturelle avait un pouvoir d'adsorption plus élevé que celui de différents matériaux, tels que la kaolinite ou la lignite. Un mécanisme d'échange d'ions, où les ions F -sont échangés avec les groupements OH -contenus dans la structure de l'argile est généralement considéré comme l'étape déterminante dans le processus d'adsorption.…”

Section: Défluoruration Par Adsorption Sur La Bentonite De Maghniaunclassified

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L’Etat des Ressources En Eau au Maghreb En 2009

Filali-Meknassi

2018

Preprint

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L’eau, en tant que ressource, est un bien très important et surtout fondamental pour tous les pays. En effet, en plus d’être indispensable à la vie et à la santé de l’être humain, l’eau est un vecteur du développement socio-économique. Le présent ouvrage, publié par le Bureau Multipays de l’UNESCO à Rabat, regroupe les expériences de plusieurs spécialistes en eau de la région du Maghreb. L’objectif d’un tel ouvrage est de faire partager le vécu des différents experts des pays du Maghreb et de rassembler les visions de chacun pour permettre de propager de nouvelles idées visant un meilleur système de gestion de l’eau au Maghreb. IWRM

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Section: Défluoruration Par Adsorption Sur La Bentonite De Maghniaunclassified

L’Etat des Ressources En Eau au Maghreb En 2009

Filali-Meknassi

2018

Preprint

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“…Kaolinite is a well-de ned 1:1-type phyllosilicate with the chemical composition Al 2 Si 2 O 5 (OH) 4 . [11][12][13] Although the adsorption capacity for inorganic anions onto kaolinite is relatively low when compared to iron oxides, kaolinite plays a certain role in the retention of inorganic uoride science it is widely distributed in natural environments. 8,11,12,14) Iron oxides and phyllosilicates are often simultaneously present in soils and sediments, where they tend to form binary systems by iron oxides coating on the surface of phyllosilicates.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13] Although the adsorption capacity for inorganic anions onto kaolinite is relatively low when compared to iron oxides, kaolinite plays a certain role in the retention of inorganic uoride science it is widely distributed in natural environments. 8,11,12,14) Iron oxides and phyllosilicates are often simultaneously present in soils and sediments, where they tend to form binary systems by iron oxides coating on the surface of phyllosilicates. [13][14][15][16] The formation of iron oxide-phyllosilicate complexes has important in uences on the physical and chemical properties of the minerals in natural environments.…”

Section: Introductionmentioning

confidence: 99%

Binary Systems of Kaolinite and Hematite: Preparation, Characterization and Adsorption Characteristics for Fluoride

et al. 2016

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In soils and sediments kaolinite (Kao) and hematite (Hem) are often cemented together as binary systems, which have a signi cant in uence on the mobility of nutrients and pollutants in natural environments. In this study, the binary systems of kaolinite-hematite complex (KHC) and kaolinite-hematite mixture (KHM) were prepared, and the surface properties and uoride adsorption of the samples were investigated. Compared to KHM, the XRD peaks for both kaolinite and hematite in KHC were lower. The crystallinity of hematite in KHM and KHC was 94.13% and 80.99% respectively. This indicates that the surface of kaolinite in KHC was largely coated by poorly crystalline hematite, and the coating in KHM was relatively weak. The total pore volume of the samples followed the sequence of Hem > KHC > KHM > Kao, and the speci c surface area (SSA) decreased in the order of KHC > Hem > KHM > Kao. The isoelectric point (IEP) of Kao, Hem, KHM and KHC was 3.3, 7.6, 5.9 and 6.5, and the zeta potential at pH 5.5 was −18.6, 25.3, 2.8 and 10.3 mV, respectively. The uoride adsorption data of the samples were tted using one-site Langmuir, two-site Langmuir and Freundlich models, and results indicated that the binary systems possessed the surface with various adsorption sites for uoride. At pH 5.5, the adsorption capacity (q max ) of Kao, Hem, KHM and KHC was 1.92, 13.79, 7.48 and 10.46 mg·g −1 , respectively. Compared to the average of Kao and Hem, the q max of KHC increased signi cantly (P < 0.05), whereas that of KHM had no signi cant change (P > 0.05).

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“…precipitation [1][2][3], adsorption [4][5][6], ion exchange [7], or electrochemical methods [8][9][10], etc. have been applied to remove fluorides from waste water effluents.…”

Section: Introductionmentioning

confidence: 99%

The Heterogeneous Reverse Osmosis Membranes Based Separation of Fluorides with Fly Ash Pretreatment

Thaçi

Gashi

2015

Acta Phys. Pol. A

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The objective of this paper was to examine the separation efficiency of fluorides by heterogeneous reverse osmosis membranes made from cellulose acetate and modified coal with aryl diazonium salt (batch 318 K) and lignite based fly ash pretreatment. The effect of varying the feed concentration (400-100 mg/dm 3 ) of sodium and ammonium fluorides on performances of these membranes using 400 mg/dm 3 aqueous solution of sodium chloride as referent system at 1.76 MPa have been investigated. Practically no significant change in the membrane characteristics (product rate, and solute separation) by varying the above concentration of feed salt solutions. The high separation of fluoride (synthetic sample) ≈ 99% was obtained by resulting membranes pretreated with different amount and contact time of low cost adsorbent (fly ash) at pH 4. A sample of waste water effluents of cement industry was also treated with above membranes without pretreatment and the results are presented. These data indicate that the fluoride ion concentration are within acceptable level as far as environmental limits concerned, therefore, their practical application produced water of suitable quality, essentially free from fluorides.

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Experimental sorption of fluoride by kaolinite and bentonite

Cited by 70 publications

References 21 publications

L’Etat des Ressources En Eau au Maghreb En 2009

L’Etat des Ressources En Eau au Maghreb En 2009

Binary Systems of Kaolinite and Hematite: Preparation, Characterization and Adsorption Characteristics for Fluoride

The Heterogeneous Reverse Osmosis Membranes Based Separation of Fluorides with Fly Ash Pretreatment

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