Chen Junjie, Liu Xing, Ding Zhoule, He Zhenglin, Jiang Huixiong, Zhu Kaiyuan, Li Yunzhang, Shi Guosheng
Shanghai Applied Radiation Institute, State Key Lab. Advanced Special Steel, Shanghai University, Shanghai 200444, China.
Department of Physics, East China University of Science and Technology, Shanghai 200237, China.
Nano Lett. 2023 Dec 13;23(23):10884-10891. doi: 10.1021/acs.nanolett.3c03105. Epub 2023 Nov 17.
By building a thin graphene oxide membrane with Na self-rejection ability, high permeability, and multistage filtration strategy, we obtained fresh water from a saline solution under 1 bar of operating pressure. After five and 11 cycles of the multistage filtration, the Na concentration decreased from 0.6 to 0.123 mol/L (below physiological concentration) and 0.015 mol/L (fresh water), respectively. In comparison with the performance of commercial reverse osmosis membranes, energy consumption was only 10% and water flux was higher by a factor of 10. Interestingly, the energy consumption of this multistage filtration strategy is close to the theoretical lowest energy consumption. Theoretical calculations showed that such Na self-rejection is attributed to the lower transportation rate of the Na than that of water within the graphene oxide membrane for the hydrated cation-π interaction. Our findings present a viable desalination strategy for graphene-based membranes and improve the mechanistic understanding of water/ion transportation behaviors in confined spaces.
通过构建具有钠自排斥能力、高渗透性和多级过滤策略的氧化石墨烯薄膜，我们在1巴的操作压力下从盐溶液中获得了淡水。经过五级和十一级的多级过滤循环后，钠浓度分别从0.6降至0.123摩尔/升（低于生理浓度）和0.015摩尔/升（淡水）。与商业反渗透膜的性能相比，能耗仅为10%，水通量高出10倍。有趣的是，这种多级过滤策略的能耗接近理论最低能耗。理论计算表明，这种钠自排斥归因于氧化石墨烯膜内钠的传输速率低于水，这是由于水合阳离子-π相互作用。我们的研究结果为基于石墨烯的膜提供了一种可行的脱盐策略，并提高了对受限空间内水/离子传输行为的机理理解。
