화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.52, 28-34, August, 2017
Co3+ homogeneous mediator generation efficiency in a divided tubular electrochemical reactor with MFI-type zeolite membrane
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In the present work a tubular electrochemical cell with MFI-type zeolite coated membrane (TZM) was engineered and evaluated using Co2+ oxidation efficiency in high acid medium. Electrolysis of Co2+ was carried out at room temperature (20 ± 3 °C ) in 4 M H2SO4 at anodic half-cell, and showed 42% Co2+ oxidation with 0.3 V higher cell voltage than the commonly used Nafion324 membrane in planar arrangement. Further, the TZM membrane was robust when operated in the cell at different temperatures (10, 30 and 50 °C) as no noticeable change in surface morphology was observable by SEM analysis. Further testing showed Co2+ oxidation efficiency decreased with temperature and increased with current density, suggesting stable operation of the TZM but structural change in cobalt precursor. The TZM membrane showed less resistance 0.91 Ω cm2 (at 10 °C) than Nafion324, which is decreased with increasing temperature from 10 °C to 50 °C. A 72 h test of the TZM at slightly elevated current density (70 mA cm2) showed increased oxidation efficiency of Co2+ to 57% compared to the traditional planar cell with Nafion324 (43%). Therefore, the engineered tubular electrochemical reactor with TZM is robust for generation of homogeneous mediators towards environmental pollution removal.
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