Cross-linking to prepare composite graphene oxide-framework membranes with high-flux for dyes and heavy metal ions removal
| Autor: | Hu-Cheng Yang, Shuang-Yan Huan, Guangming Zeng, Peng Zhang, Can-Hui Deng, Hongyu Liu, Ji-Lai Gong |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Graphene General Chemical Engineering Metal ions in aqueous solution Oxide Portable water purification Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Desalination Industrial and Manufacturing Engineering 0104 chemical sciences law.invention chemistry.chemical_compound Membrane Chemical engineering chemistry law Environmental Chemistry Isophorone diisocyanate Methylene 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 322:657-666 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2017.04.068 |
| Popis: | Although graphene oxide framework-based membranes separation represent an effective and potential process in water purification and desalination, instability and low flux of the membrane make them still challenging in industrial application. Herein, isophorone diisocyanate (IPDI) was selected as cross-linking for covalent modification of graphene oxide nanosheets to design the newly graphene oxide-framework membranes (GOF) by a facile vacuum-assisted filtration method. The cross-linked GO-IPDI membrane can be used to effectively remove dyes and heavy metals via filtration. Results of filtration experiments and microstructure characterization confirmed that IPDI cross-linking GO not only enhanced structural stability but also enlarged the nano-channels among GO sheets for higher water permeability. The GO-IPDI membrane exhibited a high flux of 80–100 L m−2 h−1 bar−1 under an extremely low external pressure (1.0 bar). It exhibited a high rejection rate (above 96%) for dyes including methylene blue, methylene orange and rhodamine-B and congo red. While the retention was moderate for Pb2+, Cu2+, Cd2+, Cr3+ ranging from 40% to 70%. These results demonstrated the potential application of GO-IPDI in wastewater and provided a novelty way of design and fabrication of high water permeability and excellent separation performance of graphene-based membranes product. |
| Databáze: | OpenAIRE |
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