Archive

Volume 2, Number 5 / October issue 2016
Ephraim E. Khansi, Chinyere A. Anyama, Ayi A. Ayi, Jude C. Onwuka
Synthesis and characterization of layered double hydroxide nanostructures and their application in the removal of Fe>sup>2+ and Ca2+ ions from oil wells
Abstract

Four new metal-aluminum layered double hydroxides (LDHs): Mg-Al(OH)2PO4 1, Mg-Al(OH)2PO4PF6 2, Ca-Al(OH)2SO4, 3 and Ca-Al(OH)2PO4PF6 4, were prepared by co-precipitation method followed by mild hydrothermal processing at 60 o C. Mg2+ and Ca2+ in solution with Al3+ was titrated with NaOH over 3-5 h to yield Mg-Al and Ca-Al layered double hydroxides, respectively, incorporating PO43-, PO43-PF6- and SO42- anions in the inter-lamellar spaces. The isolated compounds were characterized with the help of XRD, IR, SEM/EDAX and their ability to remove scale forming ions from aqueous system was studied with the help of Atomic Absorption Spectroscopy (AAS). The SEM micrographs of Mg-O-Al-OH and Ca-O-Al-OH layers intercalated with PO43- and / or [PO4PF6 ]4- anions are similar consisting of uniform nano- spheres with average size of 100 nm, while the M-O-Al-OH layer of compound 3, intercalated with SO42- anions consists of hexagonal nano-plate crystals. In the infrared spectra, the characteristic absorption band for water molecules was observed in all the compounds. The XRD pattern showed that d012 and d104 peaks of M-Al-PO4 LDHs corresponding to interplanar spacing of 3.4804 and 2.5504 Å respectively, shifted to higher 2θ values for M-Al-PO4PF6 system, which indicates a decrease in the interlamellar spacing as PF6 - was incorporated along with PO43- anion. The XRD pattern for Ca-Al-SO4 LDHs was quite different, showing the presence of low angle peaks at 2θ = 11.68 and 14.72o. The results of the column adsorption studies showed that there was a significant removal of Ca2+ by all the compounds under investigation with efficiency of 84 -99 %. Whereas compounds 1 and 2 removes Fe2+ effectively with efficiency of 98.73 and 99.77 %, respectively, compounds 3 and 4 were shown to have little or no effect.
Keywords: Layered double hydroxides, nanospheres, nanoplates, adsorption, nanostructures

Cite this article:
Ephraim E. Khansi, Chinyere A. Anyama, Ayi A. Ayi, Jude C. Onwuka. Synthesis and characterization of layered double hydroxide nanostructures and their application in the removal of Fe>sup>2+ and Ca2+ ions from oil wells. Acta Scientiae et Intellectus, 2(5)2016, 34-45.


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