Adsorption equilibrium and kinetics of fluoride on sol–gel-derived activated alumina adsorbents

Camacho, Lucy Mar; Torres, Arely; Saha, Dipendu; Deng, Shuguang

doi:10.1016/j.jcis.2010.05.066

Cited by 143 publications

(49 citation statements)

References 25 publications

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“…The isotherm may differ on the 10 International Journal of Chemical Engineering [134] same fluoride concentration according to the type of the adsorbents. For example, [135] reported that Freundlich fitted the sol-gel-derived activated alumina modified with calcium oxide and Langmuir sol-gel-derived activated alumina modified with magnesium oxide. One of the most widely used adsorbents on fluoride removal is activated alumina and it has widely been applied for fluoride adsorption [22].…”

Section: Fluoride (F − ) Adsorption Isotherm and Adsorption Capacitymentioning

confidence: 99%

“…However, modified activated alumina has shown a considerate higher adsorption capacity compared to unmodified alumina even at high fluoride concentration. For example, [135] reported the removal of fluoride by activated alumina up to 96.23 mg/g for water with a fluoride concentration of 432 mg/L in a sol-gelderived activated alumina modified with calcium oxide. The reason for the higher adsorption capacity was the alkalinity of the adsorbent and the technique used for modification of the activated alumina.…”

Section: Fluoride (F − ) Adsorption Isotherm and Adsorption Capacitymentioning

confidence: 99%

“…In fluoride adsorption, it is expected that the presence of anions in solution would enhance coulombic repulsion forces between the anions and fluoride or would compete with fluoride for the active adsorption sites and therefore fluoride adsorption is reduced or increased [66,135,136,178,179]. Eskandarpour et al [180] reported that, in fluoride adsorption, chloride and nitrate ions form outer-sphere complexes and sulfate and phosphate ions form inner-sphere complexes with binding surfaces.…”

Section: Effects Of Anion Cation and Organicmentioning

confidence: 99%

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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: Fluoride (F − ) Adsorption Isotherm and Adsorption Capacitymentioning

confidence: 99%

Section: Fluoride (F − ) Adsorption Isotherm and Adsorption Capacitymentioning

confidence: 99%

Section: Effects Of Anion Cation and Organicmentioning

confidence: 99%

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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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“…The most commonly used methods for defluoridation of water include precipitation [2], membrane processes [3], ion exchange [4] and adsorption processes [5,6]. Among the various methods, adsorption process is the cheapest, simplest and easy to implement for a developing country like China.…”

Section: Introductionmentioning

confidence: 99%

Preparation of activated aluminum-coated basalt fiber mat for defluoridation from drinking water

Zhou

Liang

Wang

et al. 2016

J Sol-Gel Sci Technol

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Alumina/basalt fiber mat composite (ABFMC) was fabricated by loading activated alumina (AA) on basalt fiber mat (BFM) via sol-gel method for fluoride removal. ABFMC and AA were characterized, and their performance for fluoride removal from aqueous solution was evaluated at different initial fluoride concentration and contact time. The loading capacity of AA on BFM increased with the increase in the sol viscosity, and the sol viscosity was optimized at 3.9 mPa s, whose corresponding loading percentage was 60.25 %. The results from the present study exhibit that ABFMC has shown good adsorption capacity for fluoride removal from aqueous solution. Experimental data revealed that the fluoride sorption on ABFMC was rapid, and 98.7 % fluoride removal was achieved within 30 min, whereas they were 96.8 % and 60 min in case of AA, respectively. The fluoride absorbed of ABFMC is well compared with that of most conventional materials and AA. The maximum of fluoride adsorbed on ABFMC was 1.872 mg/g. Adsorption isotherm analyses indicate that the adsorption of fluoride on ABFMC could be best described with the Langmuir isotherm, which suggested that the fluoride may create a monolayer layer on ABFMC. The adsorption kinetics was best described by the pseudo-second-order kinetic model followed by both intraparticle diffusion and film diffusion as the rate-controlling rate step. Graphical Abstract 0 50 100 150 200 250 60 70 80 90 100 Time(min) Fluoride removal (%) ABFMC AA

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“…As indicated in the literature survey, several other studies have also shown interest in the use of combination of zinc oxide with chromium and other materials for the efficient removal of fluoride. Noted examples 2164 include use of Zn0 2 coated carbon [25,26], Mn0 2 incorporated bentonite clay, Zn0 2 coated activated carbon [27], KMn0 4 -modified activated carbon [28] and hydrated oxides of zinc ores [29] are finding usefulness in fluoride removal.…”

mentioning

confidence: 99%

Synthesis of a New Zinc Oxide Modified Chromium Oxy (Hydroxide) for the Effective Removal of Fluoride From Drinking Water

Dash.¹

2017

IJAR

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ZnO 2 modified chromium oxy (hydroxide) (ZOCOH) has been prepared by environment friendly sol-gel method. ZOCOH demonstrated efficient (94.8%) fluoride removal capacity within pH range of 5.0-7.0. Kinetic and equilibrium study reveals that fluoride adsorption by the adsorbent follow the pseudo second order kinetic model. The result of desorption and reuse experiments indicated that the adsorbent could be employed promisingly for reduction of fluoride from drinking water.

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Adsorption equilibrium and kinetics of fluoride on sol–gel-derived activated alumina adsorbents

Cited by 143 publications

References 25 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

Preparation of activated aluminum-coated basalt fiber mat for defluoridation from drinking water

Synthesis of a New Zinc Oxide Modified Chromium Oxy (Hydroxide) for the Effective Removal of Fluoride From Drinking Water

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