Defluoridation of water using nano-magnesium oxide

Abstract

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.

Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water

“…, and PO 4 3À could interfere in the fluoride adsorption process [46,47]. Present study evaluates the fluoride adsorption behavior in the presence of 100 mg L À1 salt solutions of nitrate, chloride, sulfate and phosphate independently, at the initial fluoride concentration of 1.0 mg L À1 .…”

Nano Calcium Aluminum Mixed Oxide: A Novel and Effective Material for Defluoridation of Drinking Water

“…M a n u s c r i p t A c c e p t e d M a n u s c r i p t 37 A c c e p t e d M a n u s c r i p t A c c e p t e d M a n u s c r i p t M a n u s c r i p t 41 A c c e p t e d M a n u s c r i p t 42 [10] Nano-MgO 14.0 Concentration:5-100 mg/L Temperature:25 o C, pH:10-11 [12] Nano-AlOOH 3. …”

“…Many nano oxides such as nano MgO [11,12] , nano Al 2 O 3 [13,14] nano CaO [15][16][17] and doped multifunctional polymeric adsorbents [18] have already been very well studied. Synthesizing new mixed oxides in nano scale and exploring their adsorption and catalytic properties give a new scope for research in this area.…”

Analytical methods for determination and sensing of fluoride in biotic and abiotic sources: a review

“…1−12 In addition to playing key roles in a number of chemical and biological processes, anions have emerged as a vital focus species in sensor development. * Corresponding author: E-mail: dsbchoudhary2002@gmail.com Page 1 of 36 Analytical Methods 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 Studies have led us to a better understanding of the importance of fluoride ion in the fields of medicine and biology. 29,30 Hence, it has emerged as a promising research area for chemists.…”

“…29,30 Hence, it has emerged as a promising research area for chemists. [33][34][35][36][37][38][39][40][41][42][43] Depending upon its concentration and amount ingested, it may have a beneficial or harmful effect on human health. Drinking water and toothpaste are often supplemented with fluoride to maintain dental health.…”