Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 21, Pages 7734-7737Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00668b
Keywords
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Funding
- Beijing Natural Science Foundation [2122027]
- Beijing Science and Technology Program, National Science Foundation of China [51372133]
- National Program on Key Basic Research Project [2011CB013000]
- Tsinghua University Initiative Scientific Research Program [2012Z02102]
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The efficient recovery of acids from iron-based electrolytes using graphene oxide (GO) membranes was demonstrated for the first time. The results revealed that the amount of H+ permeating the GO membranes and reaching drains was two orders of magnitude larger than that of Fe3+. Notably, when the FeCl3 source concentration was reduced to certain extent, Fe3+ could be completely blocked by GO membranes. The mechanism for the effective separation of H+ from Fe3+ was studied, suggesting that the molecular sieving effect of GO nanocapillaries and the coordination between Fe3+ and GO were responsible for the effective blockage of Fe3+ while the rapid propagation of H+ through hydrogen-bonding networks along water layers within the interlayer spacing was responsible for the fast migration of H+. These properties made GO membranes promising cation-exchange membranes for applications of wastewater reuse and membrane separation.
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