期刊
JOURNAL OF MEMBRANE SCIENCE
卷 635, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2021.119437
关键词
rGO membrane; Cation-pi; Water permeance; Nanofiltration; Membrane stability
资金
- National Natural Science Foundation of China [12074341, U1832150, 11875236]
- Fundamental Research Funds for the Provincial Universities of Zhejiang [2020TD001]
- Scientific Research and Developed Fund of Zhejiang AF University [2017FR032]
In this study, robust K+-crosslinked reduced GO membranes were developed for treating wastewater containing multivalent heavy metal ions, showing high water permeance and excellent aqueous stability. The improved permeability was attributed to cation-pi interactions between K+ and rGO sheets, enhancing membrane stability and potential for industrial membrane separation applications.
Graphene oxide (GO) lamellar membranes exhibit great potential for application in molecular separation. However, they are still limited by low water permeation and swelling effects. Here, we develop robust K+-crosslinked reduced GO (rGO-K+) membranes for treating wastewater containing multivalent heavy metal ions. The rGO-K+ membranes demonstrated a water permeance of 86.1 L m(-2)h(-1) bar(-1) and a rejection rate of 99.8% for FeCl3, which exceed the corresponding values of state-of-the-art nanofiltration (NF) membranes for multivalent metal ion rejection. Further, the rGO-K+ membranes exhibited excellent aqueous stability under a high pressure (up to 9 bar) and acidic, neutral, and alkaline conditions. The improved permeability of the rGO-K+ membranes was attributed to the cation-pi interactions between K+ and the rGO sheets, which fixed and enlarged the interlayer spacing, as well as increased the surface hydrophilicity, thus weakening the water transport resistance. The intercalated K+ linked the adjacent layers through the cation-pi interactions, which enhanced the membrane stability. The prepared rGO-K+ membranes have potential for use in membrane separation in industrial applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据