期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 53, 期 11, 页码 6292-6301出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.9b00662
关键词
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资金
- National Science Foundation of China (NSFC) [21878049, 21336001]
- Qaidam Salt Lake Chemical Joint Research Fund Project of NSFC
- Qinghai Province State People's Government [U1507103]
Capacitive deionization (CDI) is a promising technology for desalination due to its advantages of low driven energy and environmental friendliness. However, the ion removal capacity (IRC) of CDI is insufficient for practical application because such a capacity is limited by the available surface area of the carbon electrode for ion absorption. Thus, the development of a novel desalination technology with high IRC and low cost is vital. Here, a membrane-free hybrid capacitive deionization system (HCDI) with hollow carbon@MnO2 (HC@MnO2) to capture sodium via redox reaction and hollow carbon sphere with net positive surface charges (PHC) for chloride adsorption is introduced. The as-obtained HC@MnO2 with unique structure and high conductivity can improve the utilization of MnO2 pseudocapacitive electrodes. Meanwhile, the PHC can selectively adsorb Cl- and prevent the adsorption of Na+ due to electrostatic repulsion. As expected, the membrane-free HCDI system demonstrates excellent desalination performance. The system's IRC and maximum removal rate are 30.7 mg g(-1) and 7.8 mg g(-1) min(-1), respectively. Moreover, the proposed system has a low cost because of the absence of expensive ion exchange membranes (IEM), which is suitable for practical application. The excellent performance of this HCDI makes it a promising desalination technology for future use.
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