College of Marine Science and Environment, Tianjin University of Science and Technology, Tianjin, 300457, China.
Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin, 300457, China.
Environ Sci Pollut Res Int. 2019 Jun;26(17):17787-17796. doi: 10.1007/s11356-019-05147-5. Epub 2019 Apr 28.
Capacitive deionization (CDI) was demonstrated to be an affordable technology for reduction of salt concentrations in brackish water. In this study, a novel membrane capacitive deionization (MCDI) cell was assembled by incorporating ion exchange membranes into the CDI cell which was built with high-adsorption electrodes based on ordered mesoporous carbon. The synthesized mesoporous carbon electrode was fully characterized. The simultaneous analysis of the electrosorption capacity and adsorption/desorption kinetics was evaluated by using real power plant desulfurization wastewater. The ordered mesoporous carbon was favorable for salt ion electrosorption, and the best performance was obtained by using MCDI which improved the removal efficiency of total dissolved solids (TDSs) from 65 to 82%. The total hardness and alkalinity of the effluent after treatment could meet the requirement of water quality standard for industries. Langmuir isotherm and pseudo-first-order kinetic models were found to be in best agreement with experimental results of salt ion electrosorption. The selective transport of ions between the electrode surface and bulk solution due to the ion exchange membranes resulted in a better desalination performance of MCDI. The results presented in this paper could be used for developing new electrode materials of MCDI for desalination from water.
电容去离子（CDI）被证明是一种经济实惠的技术，可用于降低咸水的盐浓度。在这项研究中，通过将离子交换膜纳入基于有序介孔碳的高吸附电极构建的 CDI 电池中，组装了一种新型的膜电容去离子（MCDI）电池。合成的介孔碳电极进行了全面的表征。通过使用实际的电厂脱硫废水，同时分析了电吸附容量和吸附/解吸动力学。有序介孔碳有利于盐离子的电吸附，而采用 MCDI 可将总溶解固体（TDS）的去除效率从 65%提高到 82%，从而获得最佳性能。处理后的出水总硬度和碱度可满足工业用水水质标准的要求。发现 Langmuir 等温线和拟一级动力学模型与盐离子电吸附的实验结果最为吻合。由于离子交换膜，电极表面和本体溶液之间的离子选择性传输导致 MCDI 的脱盐性能得到改善。本文的研究结果可用于开发用于从水中脱盐的新型 MCDI 电极材料。
