Pillar of Engineering Product Development, Singapore University of Technology and Design, Singapore 487372.
Nanoscale. 2017 Jul 20;9(28):10101-10108. doi: 10.1039/c7nr01861d.
Novel desalination technologies with high ion removal capacity and low energy consumption are desirable to tackle the water shortage challenge. Herein, we report a dual-ion electrochemistry deionization (DEDI) system with silver chloride as the electrochemical chloride release/capture anode, sodium manganese oxide as the electrochemical sodium release/capture cathode, and flow salt solution as the electrolyte. Sodium and chloride ions are synergistically released to the flow electrolyte feed at an applied positive current. Under negative current conditions, the two ions are extracted from the flow electrolyte feed to their corresponding electrodes at the same time, which can cause a conductivity decrease indicating salt removal. The salt absorption/desorption capacity of the novel deionization system is stable and reversible, up to 57.4 mg g for 100 cycles, which is much higher than that obtained by conventional or hybrid capacitive deionization devices. The charge efficiency is 0.979/0.956 during the salt desorption/absorption process. This research will be of great significance for high efficiency and low energy consumption seawater desalination.
具有高离子去除能力和低能耗的新型脱盐技术是解决水资源短缺挑战的理想选择。在此，我们报告了一种双离子电化学除盐（DEDI）系统，该系统以氯化银作为电化学氯释放/捕获阳极、氧化锰钠作为电化学钠释放/捕获阴极，以及流动盐溶液作为电解质。在施加的正向电流下，钠离子和氯离子协同释放到流动电解质进料中。在负向电流条件下，这两种离子同时从流动电解质进料中被提取到其相应的电极上，这会导致电导率下降，表明盐被去除。新型除盐系统的盐吸收/解吸容量稳定且可重复，在 100 个循环中达到 57.4mg/g，远高于传统或混合电容去离子装置的容量。在盐的解吸/吸收过程中，电荷效率为 0.979/0.956。这项研究对于高效率、低能耗的海水淡化具有重要意义。
