Abatement of fluoride from water using manganese dioxide-coated activated alumina

Tripathy, S. Swarupa; Raichur, Ashok M.

doi:10.1016/j.jhazmat.2007.09.100

Cited by 57 publications

(61 citation statements)

References 29 publications

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“…Fluoride adsorption was reduced significantly as bicarbonate was acting as a pH buffering agent, and its existence in solution increases and buffered the pH; therefore, the adsorption of fluoride was decresed [4,155,166] Kamble et al [4] reported that the addition of CO 3 2− , SO 4 2− , and HCO 3 − ions increases pH of fluoride solution in adsorption of fluoride on alumina of alkoxide nature. Similar results were observed by [29,147,165,181]. Adsorption of fluoride is more affected by the presence of phosphate ( Figure 5) compared to other coexisting anions.…”

Section: Effects Of Anion Cation and Organicsupporting

confidence: 86%

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: Effects Of Anion Cation and Organicsupporting

confidence: 86%

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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“…Among those agents, activated alumina, activated carbon, activated alumina-coated silica gel, calcite, activated saw dust, activated coconut shell carbon and activated fly ash, magnesia, serpentine, etc. are different adsorbent materials being widely used for defluoridation [6][7][8][9][10][11][12][13][14][15]. Activated alumina technique for defluoridation is one of the widely used methods.…”

Section: Introductionmentioning

confidence: 99%

Defluoridation of water using nano-magnesium oxide

Devi

Umlong

Raul

et al. 2012

Journal of Experimental Nanoscience

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Nano-sized magnesium oxide (nano-MgO) was investigated for adsorption of fluoride from water. The pure and fluoride adsorbed nano-MgO were characterised by Brunauer-EmmettTeller, high resolution transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray analyses. The surface area of the adsorbent was found to be 92.46 m 2 /g. Maximum (90%) fluoride removal was obtained with 0.6 g/L dosage of nano-MgO. Fluoride adsorption by nano-MgO was found to be less sensitive to pH variations. Fluoride sorption was mainly influenced by the presence of OH À ion. The presence of other ions studied did not affect the fluoride adsorption capacity of nano-MgO significantly. It has been observed that Freundlich model was better fitted as compared to Langmuir model which indicated the multilayer adsorption of the adsorbent following a pseudo-second order kinetics. Regeneration study showed that 1 M HCl was the best eluent with 95% desorption capacity towards fluoride removal followed by NaOH (2 M) with 25% regeneration of the adsorbent.

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“…Hence, 12 g/L TTM was considered as the optimal dose for further studies unless otherwise stated. The coefficient of distribution, K D (L/g), which shows the binding ability of adsorbent surface, was computed using K D = q e /C e [48], where q e and C e are described elsewhere.The value of K D increased from 0.74 to 2.92 L/g as a function of the adsorbent amount at pH ~ 7 (plot not shown). The increase in K D value at a given pH indicates the heterogeneity of the surface of the adsorbent [48].…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Experimental Evaluation of Activated Termite Mound for Fluoride Adsorption

Fufa¹

2016

IOSR

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Abatement of fluoride from water using manganese dioxide-coated activated alumina

Cited by 57 publications

References 29 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 of water using nano-magnesium oxide

Experimental Evaluation of Activated Termite Mound for Fluoride Adsorption

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