Capacitive deionization by ordered mesoporous carbon: electrosorption isotherm, kinetics, and the effect of modification

AbstractIn this study, an ordered mesoporous carbon (OMC) was synthesized and investigated as electrodes for capacitive deionization (CDI). The influence of working parameters on salt removal was studied and the electrosorption isotherm and kinetics were investigated. It was found that the electrosorption process fitted both Langmuir isotherm and Freundlich isotherm, and followed pseudo-first-order kinetics. The maximum electrosorptive capacity was 10.1 mg/g at the optimized applied voltage of 1.2 V and flow rate of 40 ml/min. In order to investigate the effect of surface groups on CDI efficiency, OMC was modified by H2O2 solution or thermal treatment under N2 atmosphere, without significantly changing its textural properties. X-ray photoelectron spectroscopy measurements showed that the amount of surface oxygen-containing groups was decreased and increased by the thermal and chemical treatments, respectively. CDI experiments revealed that OMC modified by H2O2 solution performed better than original OMC, ...

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