Identification of selective ion-exchange resin for fluoride sorption

Meenakshi, Sankaran; Viswanathan, Natrayasamy

doi:10.1016/j.jcis.2006.12.032

Cited by 442 publications

(223 citation statements)

References 51 publications

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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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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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“…However, the concentration of fluoride ion in groundwater is higher than 1.5 mg L À1 in many areas throughout the world. Fluoride removal techniques mainly include chemical precipitation (He and Cao, 1996), membrane processes (Tahaikt et al, 2007), adsorption (Maliyekkal et al, 2006;Wu et al, 2007), and ion exchange (Meenakshi and Viswanathan, 2007). Adsorption is effective in defluoridation, but its operation is complex.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

et al. 2011

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a b s t r a c tAn integrated electro-oxidation and electrocoagulation system was designed and used to remove As(III) and F À ions from water simultaneously. Dimensionally stable anodes (DSA), Fe electrodes, and Al electrodes were combined into an electrochemical system. Two pieces of DSA electrodes were assigned as the outside of the Fe and Al electrodes and were directly connected to the power supply as anode and cathode, respectively. The Fe and Al ions were generated by electro-induced process simultaneously. Subsequently, hydroxides of Fe and Al were formed. Arsenic ions are mainly removed by iron hydroxides and F À ions are mainly removed by the Al oxides. At the initial concentration of 1.0 mg L À1 , most of As(III) was transferred into As(V) within 40 min at current density of 4 mA cm À2 , whereas F À ions can be efficiently removed simultaneously. The effect of the ratio of Fe and Al plate electrodes and current density on the removal of As(III) and F À was investigated. With one piece of Fe plate electrode and three pieces of Al plate electrodes, it is observed that As(III) with concentration of 1 mg L À1 and F À with concentration of 4.5 mg L À1 can be removed and their final concentrations were below the values of 10 lg L À1 and 1.0 mg L À1 , respectively within 40 min. Removal efficiency of As(III) increases with the increase of solution pH. However, in the pH range of 6-7, removal efficiency of F À is the largest.

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“…The absorption at 2939 cm -1 was assigned to-CH 2 -stretch shows the bridges of CH 2 in SAMF-I composite 17,18 . The inflections around 1448 cm -1 and 785.1 cm -1 suggest the presence of wagging and rocking vibrations of methylene (-CH 2 -) bridges in polymeric chains 19,20 . The N-H bending vibration of primary amines is observed in the region 1650-1560.9 cm -1 .…”

Section: Ir Spectra Of Samf-i Resinmentioning

confidence: 97%

Synthesis and Semiconducting Behavior of Terpolymer Resin-I Derived from Sulphanilic Acid, Melamine and Formaldehyde

Ingle¹,

Hiwase²,

Kalambe³

2012

Chem Sci Trans

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Abstract:The resin-I (abbreviated as SAMF-I) was synthesized by polycondensation reaction of sulphanilic acid (0.05 M), melamine (0.05 M) and formaldehyde (0.15 M) in presence of an acid catalyst (1 M HCl). The structure of resin was determined by its elemental analysis, UV-Vis, IR data. Molecular weight of resin was determined by non aqueous conductometric titration. DC conductivity of the terpolymer was studied over a wide range of temperature. The resin was found to show semiconducting behavior since Wilson's law was obeyed. The conductivity of SAMF-I was found to be in the range 3.8x10 -8 to 2.9x10 -8 mho cm -1 for temperature range 303-423 K. The activation energy of conduction for SAMF-I was found to be 0.981 kJmol -1 .

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Identification of selective ion-exchange resin for fluoride sorption

Cited by 442 publications

References 51 publications

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

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

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

Synthesis and Semiconducting Behavior of Terpolymer Resin-I Derived from Sulphanilic Acid, Melamine and Formaldehyde

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