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Published on: July 13, 2018
Selective Iodide Recovery from Saline Water Using Electrodeposited Layered Organo-MnO2: Elucidation of the Sorption
Wataru Yoshida1,2, Saki Tanaka1, Kanon Amita1
1Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan.
Abstract:
Organo-manganese dioxide (MnO2) thin films intercalated with cetyltrimethylammonium chloride (CTAC/MnO2) were successfully fabricated via electrochemical deposition and applied for selective iodide (I-) recovery from aqueous solutions. The CTAC/MnO2 thin films exhibited high sorption capacities for I-, following Langmuir-type monolayer sorption behavior with a maximum sorption capacity of 211 mg g-1. X-ray photoelectron spectroscopy revealed that iodide sorption proceeded primarily via anion exchange with interlayer Cl-, without redox transformation of Mn species. Solvent extraction studies confirmed a 1:1 stoichiometry between CTA+ and I- during complex formation. Iodide was electrochemically desorbed under cathodic polarization and resorbed after anodic polarization, demonstrating the reusability of the material. Competitive sorption experiments demonstrated that CTAC/MnO2 thin films maintained excellent selectivity for I- even in the presence of excess chloride and sulfate ions, attributed to differences in dehydration energy and structural compatibility within the hydrophobic interlayer space. Furthermore, CTAC/MnO2 thin films successfully recovered I- from modified artificial seawater devoid of Ca2+ and HCO3-, thus highlighting the practical feasibility of this system in the absence of key interfering ions. Additionally, a D2EHPA-based solvent extraction pretreatment was developed to selectively remove Ca2+ and HCO3- from saline solutions.
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