Capacitive deionization of seawater effected by nano Ag and Ag@C on graphene

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

doi:10.1016/j.marpolbul.2014.05.020

Capacitive deionization of seawater effected by nano Ag and Ag@C on graphene

Mar Pollut Bull. 2014 Aug 30;85(2):733-7. doi: 10.1016/j.marpolbul.2014.05.020. Epub 2014 Jun 10.

Authors

P-F Cai¹, C-J Su², W-T Chang¹, F-C Chang³, C-Y Peng¹, I-W Sun², Y-L Wei⁴, C-J Jou⁵, H Paul Wang⁶

Affiliations

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.
⁶ Department of Environmental Engineering, National Cheng Kung University, Tainan 70101, Taiwan. Electronic address: wanghp@mail.ncku.edu.tw.

PMID: 24928455
DOI: 10.1016/j.marpolbul.2014.05.020

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: Ag@C; Capacitive deionization; Graphene; Saline water; Seawater.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Anti-Infective Agents / chemistry*
Electric Capacitance
Electric Impedance
Electrodes
Escherichia coli / metabolism
Graphite / chemistry
Metal Nanoparticles / chemistry*
Oxides / chemistry
Salts
Seawater / chemistry*
Silver / chemistry*
Sodium Chloride / analysis
Spectroscopy, Fourier Transform Infrared
Temperature
Water Purification / methods
X-Ray Diffraction
beta-Cyclodextrins / chemistry

Substances

Anti-Infective Agents
Oxides
Salts
beta-Cyclodextrins
Silver
Sodium Chloride
Graphite
betadex