• 文献标题:   Graphene Oxide Membranes for Tunable Ion Sieving in Acidic Radioactive Waste
  • 文献类型:   Article
  • 作  者:   WU T, WANG Z, LU YX, LIU S, LI HP, YE G, CHEN J
  • 作者关键词:   graphene oxide membrane, ions sieving, separation, uranium
  • 出版物名称:   ADVANCED SCIENCE
  • ISSN:  
  • 通讯作者地址:  
  • 被引频次:   29
  • DOI:   10.1002/advs.202002717 EA FEB 2021
  • 出版年:   2021

▎ 摘  要

Graphene oxide (GO) membranes with unique nanolayer structure have demonstrated excellent separation capability based on their size-selective effect, but there are few reports on achieving ion-ion separation, because it is difficult to inhibit the swelling effect of GO nano sheets as well as to precisely control the interlayer spacing d to a specific value between the sizes of different metal ions. Here, selective separation of uranium from acidic radioactive waste containing multication is achieved through a precise dual-adjustment strategy on d. It is found that GO swelling is greatly restricted in highly acidic solution due to protonation effect. Then the interlayer spacing is further precisely reduced to below the diameter of uranyl ion by increasing the oxidation degree of GO. Sieving uranyl ions from other nuclide ions is successfully realized in pH =3-3 mol L-1 nitric acid solutions.