Expulsion of Fluoride and Arsenate from Water Solution by Mg/Fe Layered Double Hydroxide

Abstract

In this work an attempt was made to remove fluoride and arsenate from the aqueous solution by using calcined Mg/ Fe layered double hydroxide. Calcined Mg/Fe Layered double hydroxide (Mg/Fe-CLDH) was used as an adsorbent for expulsion of fluoride and arsenate from the water solution in this study. In this Mg/Fe layered double hydroxide was prepared by using co-precipitation method by using Magnesium Nitrate (Mg(NO3)2.6H2O) and Ferric Nitrate (Fe(NO3)3.9H2O). After this sample was washed by the centrifuge method and then sample was freeze dried to get the nanopowders. This nanopowers was calcined at about 400oC after this Fluoride stock solution was prepared by dissolving NaF into deionized water then Mg/Fe LDH nanopowder was used as the adsorbent, by applying LDH nanopowder to the stock solution samples were taken out from the solution at different time interval and then this samples were analysed by UV Visible Spectrometer with the help of the ethanol and methyl orange.
Arsenate stock solution was prepared by dissolving Na2HAsO4.7H2O into deionized water water then Mg/Fe LDH nanopowder was used as the adsorbent, by applying LDH nanopowder to the stock solution samples were taken out from the solution at different time interval and then this samples were analysed by Atomic Adsorption Spectroscopy with the help of Sodium borohydride (NaBH4), Aluminium chloride (AlCl3), Ascorbic acid, Sodium hydroxide (NaOH), Potassium Iodide (KI).
In this work adsorbent behaviour of calcined LDH with time dependency was analysed. For this, respectively. The adsorbents were characterized by XRD, FT-IR, FESEM, UV Visible Spectrometer, Atomic Adsorption Spectroscopy and the analysis results demonstrated by the adsorption mechanism.