Journal
CARBON
Volume 145, Issue -, Pages 140-148Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.12.098
Keywords
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Funding
- National Natural Science Foundation of China [51678556, 51738013]
- Major Science and Technology Program for Water Pollution Control and Treatment [2015ZX07402003-3]
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Graphene is a promising material in membrane separation. However, high water permeability as well as high rejection against contaminants is still demanded yet challenging for graphene-based membranes fabrication. In this work, we synthesized an oxygen-containing group-modified reduced graphene oxide membrane (O-rGOM), which was designed by substituting the surface layers of rGO membranes with GO flakes. The number of oxygen-containing groups on membrane surface was modulated by the [GO]/[rGO] ratio during the construction of O-rGOM. Results demonstrated that a [GO]/[rGO] ratio of 1: 4 was optimal, with oxygen-containing groups modifying the pore surface of rGO laminates effectively. Furthermore, the O-rGOM showed improved hydrophilicity and water permeability. In addition, modification of the oxygen-containing groups promoted the zeta potential around the membrane pore, resulting in enhanced electrostatic interaction between the membrane and charged contaminants. The O-rGOM structure exhibited 18.2% and 5.2% improvement in acid orange 7 and methylene blue rejection, respectively, as well as similar to 2.6 times enhancement in water permeability compared with the rGOM. This work provides a feasible approach for the design of graphene-based membranes to improve filtration performance with enhanced water permeability. (c) 2019 Elsevier Ltd. All rights reserved.
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