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Nanosheet-templated graphene oxide membranes for fast molecule separation |
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| Authors: | Zhen Lin Chuan Hu Qinglin Liu Qiugen Zhang |
| Affiliation: | 1. Department of Chemical and Biochemical Engineering, College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, China Department of Applied Physics, School of Science, Aalto University, Espoo, Finland Contribution: Conceptualization (equal), Data curation (lead), Formal analysis (lead), Investigation (lead), Methodology (lead), Project administration (equal), Writing - original draft (lead), Writing - review & editing (supporting);2. Department of Chemical and Biochemical Engineering, College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, China Contribution: Data curation (supporting), Formal analysis (supporting), Investigation (supporting), Methodology (supporting), Project administration (supporting), Writing - original draft (supporting);3. Department of Chemical and Biochemical Engineering, College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, China Contribution: Conceptualization (supporting), Data curation (supporting), Formal analysis (supporting), Investigation (supporting), Methodology (supporting), Project administration (equal), Resources (supporting), Software (supporting), Supervision (supporting), Writing - review & editing (supporting);4. Department of Chemical and Biochemical Engineering, College of Chemistry & Chemical Engineering, Xiamen University, Xiamen, China |
| Abstract: | Intercalated laminar membrane with controllable interlayer spacing (d-spacing) is one of the most effective membranes for fast molecule separation. In this work, we demonstrate a versatile strategy to create nanosheet-templated water channels in laminar graphene oxide (GO) membranes. The 1.2 nm-thick nickel hydroxide nanosheets as sacrificed intercalators provide a chance to control the d-spacing. The resultant membranes have controllable channels and exhibit over six times higher water permeance than the unintercalated membrane. The 880 nm-thick nanosheet-templated GO (NST-GO) membrane has accurate d-spacing of about 1.14 nm and shows high water permeance of 120.3 L m−2 h−1 bar−1 and good molecule separation property, reflecting in high rejection for larger dyes (90.1% for erythrosine B [EB]), while low rejection for smaller dyes (58.3% for methylene blue [MB]). Furthermore, this strategy of intercalating and sacrificing nanosheets has higher potential than traditional intercalation in controlling d-spacing of laminar membranes. |
| Keywords: | d-spacing control laminar membrane molecule separation nanosheet-templated membrane sacrificed intercalator |