Synthesis of arsenic sorbent by the reaction of magnesium hydroxide with aqueous iron(III) chloride solution

• Published in: Russian journal of applied chemistry Vol. 90; no. 9; pp. 1469 - 1474
• Main Authors: Isupov, V. P., Katunina, A. I., Borodulina, I. A., Shatskaya, S. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-09-2017; Springer Nature B.V
• Subjects: Aqueous solutions; Arsenic; Chemical industry; Chemical synthesis; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Industrial Chemistry/Chemical Engineering; Iron chlorides; Iron oxides; Magnesium hydroxide; Sorbents; Various Technologic Processes
• ISSN: 1070-4272; 1608-3296
• DOI: 10.1134/S1070427217090142

The reaction of magnesium hydroxide with a concentrated aqueous solution of iron(III) chloride yields a mixture of magnesium–iron layered double hydroxide and iron oxide–hydroxide in the akaganeite form. The content of these phases depends on the Mg/Fe atomic ratio in the starting reactant mixture. Iron oxide–hydroxide is the major reaction product at the Mg/Fe atomic ratio in the interval 1.5–1.75, and layered magnesium–iron layered double hydroxide, at Mg/Fe = 3–4. The ability of the synthesized products to take up As(III) from aqueous solutions was studied. These sorbents allow the arsenic concentration to be decreased from 3–5 mg L
–1
to values below MPC (0.01 mg L
–1
).