Department of Materials Science and Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931-1295, USA.
J Colloid Interface Sci. 2019 Mar 7;538:420-425. doi: 10.1016/j.jcis.2018.11.105. Epub 2018 Nov 28.
Capacitive deionization (CDI), which is one of up-and-coming water treatment technologies, is based on ion electrostatic adsorption on electrode surface. Herein, three-dimensional channel-structured graphene (CSG), which was synthesized via exothermic reaction between liquid potassium and carbon monoxide gas, was demonstrated as an efficient electrode material for CDI. Namely, the CSG electrode exhibited a specific capacity of 207.4 F/g at 0.2 A/g in 1 M NaCl aqueous solution. In a batch-mode recycling system, the electrosorption capacity of CSG can achieve 5.70 and 9.60 mg/g at 1.5 V in 50 and 295 mg/l NaCl aqueous solutions, respectively. The excellent electrosorption capacity of CSG, especially under low saline concentration, can be attributed to the synergistic effect of its large surface area (711.9 m/g), unique channel structure, and oxygen functional groups.
电容去离子（CDI）是一种新兴的水处理技术，其原理基于离子在电极表面的静电吸附。本文以液态钾和一氧化碳气体的放热反应合成的三维通道结构石墨烯（CSG）作为 CDI 的高效电极材料。在 1 M NaCl 水溶液中，CSG 电极在 0.2 A/g 的电流密度下表现出 207.4 F/g 的比容量。在批量式回收系统中，CSG 在 1.5 V 下于 50 和 295 mg/L NaCl 水溶液中的电吸附容量分别达到 5.70 和 9.60 mg/g。CSG 具有优异的电吸附容量，特别是在低盐浓度下，这归因于其大的比表面积（711.9 m/g）、独特的通道结构和含氧官能团的协同作用。
