Synthesis and analytical application of Fe(III) based heteropoly acid cation exchangers

Abstract

<span style="color:black;mso-bidi-language:HI">New inorganic ion exchangers based on Fe(III) namely ferric tungstomolybdate, ferric tungstosilicate, ferric tungstovanadate have been synthesized and characterized on the basis of chemical composition. The ion exchange capacity<span style="color:#3D3D3D; mso-bidi-language:HI">, <i><span style="mso-bidi-font-family:Arial; color:black;mso-bidi-language:HI">p</span></i><span style="mso-bidi-font-family: Arial;color:black;mso-bidi-language:HI">H<i> </i><span style="color: black;mso-bidi-language:HI">titrations, distribution

<span style="color:black;mso-bidi-language:HI">Coefficients, FTIR, TGA and thermal stabilities<span style="color:#202020;mso-bidi-language:HI">. <span style="color:black;mso-bidi-language:HI">The ion exchangers were found to be stable in 1.0 M mineral acids and 1.0 M metal chloride solutions<span style="color:#202020;mso-bidi-language:HI">. <span style="color:black; mso-bidi-language:HI">The formulae proposed for the exchanger<span style="color:#202020;mso-bidi-language:HI">s <span style="color:black; mso-bidi-language:HI">are Fe₂O₃<span style="color:#202020;mso-bidi-language:HI">.<span style="color:black; mso-bidi-language:HI">2WO_{<span style="color:#202020;mso-bidi-language: HI">3</span>}<span style="color:#202020;mso-bidi-language:HI">.<span style="color:black;mso-bidi-language:HI">8H_{<span style="color:#202020; mso-bidi-language:HI">2</span>}<span style="color:black;mso-bidi-language: HI">O; Fe₂O_{<span style="color:#202020;mso-bidi-language: HI">3</span>}<span style="color:#202020;mso-bidi-language:HI">.<span style="color:black;mso-bidi-language:HI">2WO_{<span style="color: #202020;mso-bidi-language:HI">3</span>}<span style="color:#202020; mso-bidi-language:HI">.<span style="color:black;mso-bidi-language:HI">2SiO_{<span style="color:#202020;mso-bidi-language:HI">2</span>}<span style="color:#202020;mso-bidi-language:HI">.<span style="color:black; mso-bidi-language:HI">9H_{<span style="color:#202020;mso-bidi-language: HI">2</span>}<span style="color:black;mso-bidi-language:HI">O and Fe₂O₃<span style="color:#202020;mso-bidi-language:HI">.<span style="color:black; mso-bidi-language:HI">2WO_{<span style="color:#202020;mso-bidi-language: HI">3</span>}<span style="color:#202020;mso-bidi-language:HI">.<span style="color:black;mso-bidi-language:HI">V₂O₅.10H₂O respectivel<span style="color:#202020;mso-bidi-language:HI">y. <span style="color:black;mso-bidi-language:HI">Based on the difference in <i>K</i>_d values<span style="color:#202020;mso-bidi-language:HI">, <span style="color:black;mso-bidi-language:HI">some analytically important separations of metal ions have been achieved. The important mixtures analyzed are Al^{<span style="color:#202020;mso-bidi-language:HI">3+</span>}<span style="color:#202020;mso-bidi-language:HI"> <span style="color:black; mso-bidi-language:HI">- Mg^{<span style="color:#202020;mso-bidi-language: HI">2</span>}^{<span style="color:black;mso-bidi-language:HI">+</span>}<span style="color:black;mso-bidi-language:HI">, Co²⁺- Pb²⁺, Hg²⁺ - Pb²⁺, Ni²⁺- Pb²⁺, <i><span style="mso-bidi-font-family:Arial;color:black;mso-bidi-language:HI">C</span></i><span style="mso-bidi-font-family:Arial;color:black;mso-bidi-language:HI">d^{<span style="color:black;mso-bidi-language:HI">2</span>}<i>^{<span style="mso-bidi-font-family:Arial;color:black;mso-bidi-language:HI">+</span>}</i><i><span style="mso-bidi-font-family:Arial;color:black;mso-bidi-language:HI"> </span></i><span style="mso-bidi-font-family:Arial;color:black;mso-bidi-language:HI">-<i> </i><span style="color:black;mso-bidi-language:HI">Pb²⁺ and Cu²⁺ - <span style="mso-bidi-font-family:Arial;color:black;mso-bidi-language:HI">Pb^2<i>+</i><i>.</i>

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