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Journal of Nanomaterials
Volume 2017, Article ID 1934724, 8 pages
https://doi.org/10.1155/2017/1934724
Research Article

Plasma Treated Active Carbon for Capacitive Deionization of Saline Water

1Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
2Department of Electrical and Computer Engineering and Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA

Correspondence should be addressed to Aiping Zeng; tp.au@gnez.gnipia and Qi Hua Fan; ude.usm.rge@nafq

Received 23 February 2017; Revised 9 May 2017; Accepted 28 May 2017; Published 19 July 2017

Academic Editor: Flavio Colmati

Copyright © 2017 Aiping Zeng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The plasma treatment on commercial active carbon (AC) was carried out in a capacitively coupled plasma system using Ar + 10% O2 at pressure of 4.0 Torr. The RF plasma power ranged from 50 W to 100 W and the processing time was 10 min. The carbon film electrode was fabricated by electrophoretic deposition. Micro-Raman spectroscopy revealed the highly increased disorder of sp2 C lattice for the AC treated at 75 W. An electrosorption capacity of 6.15 mg/g was recorded for the carbon treated at 75 W in a 0.1 mM NaCl solution when 1.5 V was applied for 5 hours, while the capacity of the untreated AC was 1.01 mg/g. The plasma treatment led to 5.09 times increase in the absorption capacity. The jump of electrosorption capacity by plasma treatment was consistent with the Raman spectra and electrochemical double layer capacitance. This work demonstrated that plasma treatment was a potentially efficient approach to activating biochar to serve as electrode material for capacitive deionization (CDI).