Calcium fluoride recovery from fluoride wastewater in a fluidized bed reactor

Aldaco, Rubén; Garea, A.; Irabien, Ángel

doi:10.1016/j.watres.2006.11.040

Cited by 118 publications

(53 citation statements)

References 17 publications

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“…Fluoride has a comprehensive application in electroplating, smelt, chemical and electricity generation [1]. The discharge of fluoride containing wastewater increased the fluoride content of soil and groundwater [2].…”

Section: Introductionmentioning

confidence: 99%

Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH− release

Guan

Zhao

2016

Separation and Purification Technology

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Section: Introductionmentioning

confidence: 99%

Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH− release

Guan

Zhao

2016

Separation and Purification Technology

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“…A variety of treatment procedures have been reported for the removal of excess fluoride from polluted waters based on precipitation (Aldaco et al 2007;Akbar et al 2008;Reardon and Wang 2000;Cengeloglu et al 2002;Yadav et al 2006;Nawlakhe et al 1975;Saha 1993), ion exchange (Meenakshi and Viswanathan 2007;Castel et al 2000;Feng Shen et al 2003;Chubar et al 2005;Apambire et al 1997;Singh et al 1999), reverse osmosis (Sehn 2008;Simons 1993), Donnan dialysis (Tor 2007;Garmes et al 2002;Hichour et al 1999), electrodialysis (Lahnid et al 2008;Menkouchi et al 2007;Hichour et al 2000;Adikari et al 1989;Amer et al 2001), nanofiltration ), membrane-based methods (Dieye et al 1998;Mjengera and Mkongo 2003;Lhassani et al 2001;Mameri et al 2001), electrocoagulation (Hu et al 2003), and adsorption on to various adsorbents (Shihabudheen et al 2006;Onyango et al 2006;Tripathy et al 2006;Mohapatra et al 2004;Raichur and Jyoti Basu 2001). The choice of the method depends on conditions like area, concentration, availability of resources, etc.…”

Section: Introductionmentioning

confidence: 99%

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

2015

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Background: Deleterious effects of fluoride contamination in ground waters on the health of human beings are well known and intensive research on developing de-fluoridation methods is globally pursued. Of the various methodologies, increasing interest is being envisaged in using the adsorption methods based on active carbons derived from plant material. In the present investigation, Nitric acid activated carbon derived from barks of Vitex negundo plant (NVNC) is probed for its de-fluoridation abilities. Methods: The activated carbon is characterized adopting various physicochemical methods and surface morphological studies are carried out using FT-IR and SEM-EDX techniques. The effect of various parameters such as pH, sorbent dosage, agitation time, initial concentration of fluoride, temperature, particle size and presence of foreign ions on the extraction of the fluoride is studied adopting Batch methods.The adsorption process is analyzed with Freundlich, Langmuir, Temkin and Dubinin-Radushkevich (D-R) isotherms and kinetics of adsorption is studied using pseudo first-order, pseudo second-order, Weber and Morris intraparticle diffusion, Bangham's pore diffusion and Elovich equations. The methodology developed is applied to real ground water samples.

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“…Among all, adsorption technique is widely acceptable and many adsorbents have been tested for fluoride removal from contaminated water [2][3][4][5][6][7][8][9][10]. However, the viability of adsorption techniques is greatly dependent on the development of adsorptive materials and optimization of the performance of adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Fluoride adsorption studies on mixed-phase nano iron oxides prepared by surfactant mediation-precipitation technique

Mohapatra

Rout

Singh

et al. 2011

Journal of Hazardous Materials

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Experimental procedure MaterialsFe(NO 3 ) 3 .7H 2 O and cetyltrimethyl ammonium bromide (CTAB) used for synthesis were of Analytical Grade (E Merck, India). Sodium fluoride (Ranchem, India) was used for the preparation of the standard fluoride (1000 mg/L) stock solution. Sodium 2-(para sulfophenyl azo)-1,8-dihydroxy-3,6-naphthalene disulfonate (SPADNS) and zirconyl oxychloride used for fluoride analysis were of GR (E. Merck) grade. Preparation of mixed iron oxide/hydroxide sample by surfactant mediationprecipitation techniquePage 5 of 38A c c e p t e d M a n u s c r i p t 5 100 mL of a 0.88 M Fe(NO 3 ) 3 was taken in a clean, dry beaker. To this 5 mL of 10 % cetyltrimethyl ammonium bromide (CTAB) solution was added and the solution was stirred for 2 h. The pH of the solution was adjusted to 10.0 by addition of 1 M NaOH solution under stirring. The contents were further stirred for 24 h after pH adjustment. The precipitate formed was filtered through a G4 frit crucible and was thoroughly washed with water until the filtrate was free of nitrate. The precipitate was then transferred to a beaker and the volume made up to 500 mL with water. The beaker was kept at 60 0 C for 12 h in an oven. After aging, the solution was finally filtered through a G4 crucible, washed thoroughly with water and dried in an oven at 100 0 C for 24 h. Batch fluoride sorption experiments on the prepared sample and fluoride analysisA 100 mg/L fluoride stock solution was prepared by dissolving 0.221g of NaF in 1L of double distilled water. The experimental solutions were prepared by appropriate dilutions of the above solution. 0.1 g of the sample was taken in a 100 mL polyethylene plastic vial and 50 mL of fluoride solution of known concentration was added. The contents were kept for constant shaking in a temperature controlled water bath shaker

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Calcium fluoride recovery from fluoride wastewater in a fluidized bed reactor

Cited by 118 publications

References 17 publications

Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH− release

Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH− release

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

Fluoride adsorption studies on mixed-phase nano iron oxides prepared by surfactant mediation-precipitation technique

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