Tuning the functional groups of a graphene oxide membrane by ·OH contributes to the nearly complete prevention of membrane fouling
| Autor: | Yu Tao, Xue Xia, Yang-Cheng Ding, Muhammad Rizwan Haider, Ya-Nan Hou, Rui-Yun Ren, Meijun Liu, Aijie Wang, Bo Zhang, Wanrun Jiang, Jing-Long Han, Hao-Yi Cheng, Depeng Zhang, Hong-Cheng Wang, Zhigang Wang, Wen-Li Jiang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fouling
Graphene Membrane fouling Oxide Filtration and Separation 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences law.invention chemistry.chemical_compound Membrane Monomer chemistry Chemical engineering law Surface modification General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Alginic acid |
| Zdroj: | Journal of Membrane Science. 576:190-197 |
| ISSN: | 0376-7388 |
| Popis: | Graphene oxide(GO) membrane has the potential to become the next generation of water purification membrane, which could help to ease water crisis in many counties. However, organic membrane fouling is still difficult to avoid. In this study, we used a trace of ·OH to mitigate fouling by tuning surface functional groups of GO membrane and altering fouling layer. X-ray photoelectron spectroscopy (XPS) analysis indicated that ·OH changed the epoxide-dominated GO surface to a hydroxyl-dominated surface. The adhesion force between the GO membrane and organic microspheres decreased from 0.37 ± 0.16 mN/m to 0.08 ± 0.14 mN/m after functionalization by ·OH. Quantum mechanical simulations showed that the interaction energy of the hydroxyl-dominated GO surface with a modified alginic acid monomer was 4.07 eV, which was lower than that (5.68 eV) between the epoxide-dominated GO surface and the modified alginic acid monomer. A thicker water molecule layer formed on the hydroxyl-dominated GO surface than on the epoxide-dominated GO surface through hydrogen bonding, thus repelling organic foulants. Combined with the oxidative effect of ·OH, the current method achieved the nearly complete prevention of membrane fouling. This result could provide us a new perspective for the fouling-free membrane-based water purification process. |
| Databáze: | OpenAIRE |
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