Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 518, Issue -, Pages 69-75Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.02.019
Keywords
Graphene hydrogel; Carbon nanotube; Electrode material; Capacitive deionization
Categories
Funding
- National Natural Science Foundation of China [21777118, 21577099]
- Foundation of Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, China [YRWEF201606]
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Capacitive deionization (CDI) is a technology used to remove salt from brackish water, and it is an energy saving, low-cost method compared with other methods, such as reverse osmosis, multi-stage ash distillation and electrodialysis. In this paper, three-dimensional (3D) graphene hydrogels modified with single-walled carbon nanotubes (SWCNTs) or multi-walled carbon nanotubes (MWCNTs) were synthesized by a one-step water bath method to increase the conductivity of materials and reduce the aggregation of the graphene sheets. The CDI performance differences between the two materials were compared and discussed. The results suggested that SWCNTs/rGO had a higher electrosorption capacity (48.73 mg/g) than MWCNTs/rGO, and this was attributed to its high specific surface area (308.37 m(2)/g), specific capacity (36.35 F/g), and smaller charge transfer resistance compared with those of the MWCNTs/rGO electrode. The results indicate SWCNTS/rGO is a promising and suitable material for CDI technology and we provide basic guidance for further CNTs/graphene composite research. (C) 2018 Elsevier Inc. All rights reserved.
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