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Capacitive deionization of seawater effected by nano Ag and Ag@C on graphene |
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| Authors: | P.-F. Cai C.-J. Su W.-T. Chang F.-C. Chang C.-Y. Peng I-W. Sun Y.-L. Wei C.-J. Jou H.Paul Wang |
| Affiliation: | 1. Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan;2. Department of Chemistry, National Cheng-Kung University, Tainan 70101, Taiwan;3. The Experimental Forest, National Taiwan University, Chu-Shan 55750 Nan-Tou Hsien, Taiwan;4. Department of Environmental Science and Engineering, Tunghai University, Taichung 407, Taiwan;5. Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 811, Taiwan |
| Abstract: | Drinking water shortage has become worse in recent decades. A new capacitive deionization (CDI) method for increasing water supplies through the effective desalination of seawater has been developed. Silver as nano Ag and Ag@C which was prepared by carbonization of the Ag+-β-cyclodextrin complex at 573 K for 30 min can add the antimicrobial function into the CDI process. The Ag@C and Ag nanoparticles dispersed on reduced graphene oxide (Ag@C/rGO and nano Ag/rGO) were used as the CDI electrodes. The nano Ag/rGO and Ag@C/rGO electrodes can reduce the charging resistant, and enhance the electrosorption capability. Better CDI efficiencies with the nano Ag/rGO and Ag@C/rGO electrodes can therefore be obtained. When reversed the voltage, the electrodes can be recovered up to 90% within 5 min. This work presents the feasibility for the nano Ag and Ag@C on rGO electrodes applied in CDI process to produce drinking water from seawater or saline water. |
| Keywords: | Capacitive deionization Graphene Ag@C Seawater Saline water |
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