Resin-enhanced rolling activated carbon electrode for efficient capacitive deionization

Abstract Capacitive deionization (CDI) has emerged as an efficient process for low-salinity desalination, but electrode materials remain a major bottleneck. This study presents new hybrid CDI electrodes that for the first time directly incorporate ion exchange resins into activated carbon electrodes via a rolling press method. These thin and integrated electrodes showed superior performance over traditional membrane-electrode assemblies. When used in 2.0 g/L NaCl solution they increased desalination efficiency by 29–35% and 70–76% compared with activated carbon electrodes and carbon cloth electrode, respectively. The difference further increased to 41–47% and 121–131% when a lower concentration of 0.5 g/L NaCl was used. The resin-embedded carbon electrodes showed an electrosorption capacity of 12.7 and 18.3 mg NaCl/g electrode in 0.5 and 2.0 g/L NaCl solution, respectively. The charge efficiency ranged from 85–87%, and energy consumption was reduced by 25%. The high performance of the resin-enhanced activated carbon electrodes in CDI is attributed to pre-concentration of target ions and blockage of co-ions especially in low salinity conditions. This approach holds a good potential for CDI development, and further studies are needed for corrosion inhibition and capacity improvement.

[1]  Won Il Cho,et al.  Capacitive deionization of NaCl solution with carbon aerogel-silicagel composite electrodes , 2005 .

[2]  Volker Presser,et al.  Review on the science and technology of water desalination by capacitive deionization , 2013 .

[3]  Xiaowei Sun,et al.  Kinetic and isotherm studies on the electrosorption of NaCl from aqueous solutions by activated carbon electrodes , 2011 .

[4]  Joseph C. Farmer,et al.  Capacitive Deionization of NaCl and NaNO3 Solutions with Carbon Aerogel Electrodes , 1996 .

[5]  Marc A. Anderson,et al.  Capacitive deionization as an electrochemical means of saving energy and delivering clean water. Comparison to present desalination practices: Will it compete? , 2010 .

[6]  M. Elimelech,et al.  The Future of Seawater Desalination: Energy, Technology, and the Environment , 2011, Science.

[7]  K. Moon,et al.  3D porous graphene with ultrahigh surface area for microscale capacitive deionization , 2015 .

[8]  Y. W. Chen,et al.  Electrosorption of NaCl Solutions with Carbon Nanotubes and Nanofibers Composite Film Electrodes , 2006 .

[9]  Zhiyong Ren,et al.  Sustainable desalination using a microbial capacitive desalination cell , 2012 .

[10]  Juan G. Santiago,et al.  Capacitive desalination with flow-through electrodes , 2012 .

[11]  Tingting Yan,et al.  Comparative Electroadsorption Study of Mesoporous Carbon Electrodes with Various Pore Structures , 2011 .

[12]  Volker Presser,et al.  Water desalination via capacitive deionization : What is it and what can we expect from it? , 2015 .

[13]  Kai Dai,et al.  NaCl adsorption in multi-walled carbon nanotubes , 2005 .

[14]  Hongbing Yu,et al.  A novel structure of scalable air-cathode without Nafion and Pt by rolling activated carbon and PTFE as catalyst layer in microbial fuel cells. , 2012, Water research.

[15]  Pei Xu,et al.  Microbial capacitive desalination for integrated organic matter and salt removal and energy production from unconventional natural gas produced water , 2015 .

[16]  Linda Zou,et al.  Novel graphene-like electrodes for capacitive deionization. , 2010, Environmental science & technology.

[17]  Peng Liang,et al.  Coupling ion-exchangers with inexpensive activated carbon fiber electrodes to enhance the performance of capacitive deionization cells for domestic wastewater desalination. , 2013, Water research.

[18]  Hongbing Yu,et al.  Catalysis kinetics and porous analysis of rolling activated carbon-PTFE air-cathode in microbial fuel cells. , 2012, Environmental science & technology.

[19]  Liyi Shi,et al.  Graphene prepared via a novel pyridine–thermal strategy for capacitive deionization , 2012 .

[20]  Min-Woong Ryoo,et al.  Improvement in capacitive deionization function of activated carbon cloth by titania modification. , 2003, Water research.

[21]  Dazhi Wang,et al.  Equilibrium and kinetic studies on the removal of NaCl from aqueous solutions by electrosorption on carbon nanotube electrodes , 2007 .

[22]  Lu Lu,et al.  Individual and competitive removal of heavy metals using capacitive deionization. , 2016, Journal of hazardous materials.

[23]  Jae-Hwan Choi,et al.  Enhanced desalination efficiency in capacitive deionization with an ion-selective membrane , 2010 .

[24]  T. D. Tran,et al.  Electrosorption of inorganic salts from aqueous solution using carbon aerogels. , 2002, Environmental science & technology.

[25]  Linda Zou,et al.  Ordered mesoporous carbons synthesized by a modified sol-gel process for electrosorptive removal of sodium chloride , 2009 .

[26]  Zhuo Sun,et al.  Electrosorptive desalination by carbon nanotubes and nanofibres electrodes and ion-exchange membranes. , 2008, Water research.

[27]  Wei Wang,et al.  Electrochemical corrosion of carbon steel exposed to biodiesel/simulated seawater mixture , 2012 .

[28]  E. Barrett,et al.  (CONTRIBUTION FROM THE MULTIPLE FELLOWSHIP OF BAUGH AND SONS COMPANY, MELLOX INSTITUTE) The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms , 1951 .

[29]  J. Farmer,et al.  Electrosorption of Chromium Ions on Carbon Aerogel Electrodes as a Means of Remediating Ground Water , 1997 .

[30]  Liyi Shi,et al.  NaCl adsorption in multi-walled carbon nanotube/active carbon combination electrode , 2006 .

[31]  Peng Liang,et al.  Using activated carbon fiber separators to enhance the desalination rate of membrane capacitive deionization , 2016 .

[32]  Zhiyong Jason Ren,et al.  Shale gas produced water treatment using innovative microbial capacitive desalination cell. , 2015, Journal of hazardous materials.

[33]  H. Bilheux,et al.  Transport of ions in mesoporous carbon electrodes during capacitive deionization of high-salinity solutions. , 2015, Langmuir : the ACS journal of surfaces and colloids.

[34]  Louis J Dankovich,et al.  A liter-scale microbial capacitive deionization system for the treatment of shale gas wastewater , 2016 .

[35]  Yong Liu,et al.  Review on carbon-based composite materials for capacitive deionization , 2015 .

[36]  P. M. Biesheuvel,et al.  Theory of membrane capacitive deionization including the effect of the electrode pore space. , 2011, Journal of colloid and interface science.