New Inorganic Ion-exchange Material for the Selective Removal of Fluoride from Potable Water Using Ion-selective Electrode

Abstract

An ion-exchange procedure involving the selective retention of fluoride ions from aqueous
 solutions containing 1, 5, 10, 20 and 50 mg F^- L^-1 using a new inorganic ion exchanger zirconium(IV)
 oxide-ethanolamine ZrO-EA and its application to fluoride removal from potable water has been
 described. A column equilibrium studies, batch process and different analytical parameters such as
 concentration, pH and temperature for the quantitative recoveries of F^- ion using ZrO-EA exchanger
 were investigated and determined by an ion selective electrode. The effect of some other anions that
 might be present with the analyte was also examined. The column experiments showed a quantitative
 collection of fluoride at low concentration in water samples with more than 96% recovery

Enhanced Defluoridation Capacity From Aqueous Media via Hydroxyapatite Decorated With Carbon Nanotube

“…Currently, there are several methods available for defluorination, such as chemical precipitation (Xin et al, 2016 ; Huang et al, 2017 ), membrane filtration (Zhang J. et al, 2017 ), electrolysis (Schaefer et al, 2017 ), ion exchange (Popat et al, 1994 ; Jamhour, 2005 ), and adsorption (Rehman et al, 2015 ; Lin et al, 2016 ). Among the above-mentioned methods, adsorption is a most attractive option owning to its low cost, high efficiency, and good flexibility (Mohan et al, 2017 ).…”

Flame atomic absorption spectrometric determination of zinc, nickel, iron and lead in different matrixes after solid phase extraction on sodium dodecyl sulfate (SDS)-coated alumina as their bis (2-hydroxyacetophenone)-1, 3-propanediimine chelates

“…The determination of trace quantity of heavy metals in environmental samples like natural water and other real samples of environmental interest in which they are found at very low concentrations, requires the use of preconcentration methods coupled to spectroscopic methods, such as ICP-AES and FAAS. The solid phase extraction (SPE), enable a wide research activity on the development of alternative methods, which are capable of highly selective for the removal of trace amounts of metal ions from solution containing complicated matrices with minimal usage of organic solvents [9][10][11][12][13][14]. The SPE can easily be adapted for FAAS to improve the detection limit and selectivity of determinations.…”

Ex-Situ vs. In-Situ Defluoridation of the Contaminated Aquifers: A State-of-the-Art Review

“…Most commonly used fluoride exchange resins are degreased and alkali treated bone, inorganic ion exchangers, Tricalcium phosphate, Fluorex, Serpentine, Carbon exchanger like defluoron s1 , Carbion, Defluoron 2, Saw dust carbon , polystyrene cation exchange resin etc. (Helmenstine,2015;Jamhour, 2005;Khichar & Kumbhat, 2015;Nagendra Rao, 2003). Ion exchange resins produce large amount of sludge and require regular regeneration making it hard to maintain at small scales.…”