Electrosorptive desalination by carbon nanotubes and nanofibres electrodes and ion-exchange membranes.

A novel membrane capacitive deionization (MCDI) device, integrating both the advantages of carbon nanotubes and carbon nanofibers (CNTs-CNFs) composite film and ion-exchange membrane, was proposed with high removal efficiency, low energy consumption and low cost. The CNTs-CNFs film was synthesized by low pressure and low temperature thermal chemical vapor deposition. Several experiments were conducted to compare desalination performance of MCDI with capacitive deionization (CDI), showing that salt removal of the MCDI system was 49.2% higher than that of the CDI system. The electrosorption isotherms of MCDI and CDI show both of them follow Langmuir adsorption, indicating no change in adsorption behavior when ion-exchange membranes are introduced into CDI system. The better desalination performance of MCDI than that of CDI is due to the minimized ion desorption during electrosorption.

[1]  John Newman,et al.  Desalting by Means of Porous Carbon Electrodes , 1971 .

[2]  Sung-Woo Hwang,et al.  Capacitance control of carbon aerogel electrodes , 2004 .

[3]  Chi-Woo Lee,et al.  Desalination of a thermal power plant wastewater by membrane capacitive deionization , 2006 .

[4]  Y. W. Chen,et al.  Electrosorption of ions from aqueous solutions with carbon nanotubes and nanofibers composite film electrodes , 2006 .

[5]  Yoshiyuki Show,et al.  Electric double layer capacitor with low series resistance fabricated by carbon nanotube addition , 2007 .

[6]  François Béguin,et al.  Nanotubular materials as electrodes for supercapacitors , 2002 .

[7]  C. F. Schutte,et al.  Capacitive Deionization Technology™: An alternative desalination solution , 2005 .

[8]  Sheng Dai,et al.  Electrosorption capacitance of nanostructured carbon-based materials. , 2006, Journal of colloid and interface science.

[9]  Zhuo Sun,et al.  ELECTROSORPTION OF FeCl3 SOLUTIONS WITH CARBON NANOTUBES AND NANOFIBERS FILM ELECTRODES GROWN ON GRAPHITE SUBSTRATES , 2007 .

[10]  B. Fang,et al.  A modified activated carbon aerogel for high-energy storage in electric double layer capacitors , 2006 .

[11]  Eric Hu,et al.  Electrosorption: an alternative option for desalination , 2007 .

[12]  Linda Zou,et al.  Using mesoporous carbon electrodes for brackish water desalination. , 2008, Water research.

[13]  Yongsoo Jeong,et al.  Nanoporous activated carbon cloth for capacitive deionization of aqueous solution , 2006 .

[14]  R. Nemanich,et al.  First- and second-order Raman scattering from finite-size crystals of graphite , 1979 .

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

[16]  Hang Shi,et al.  Studies of activated carbons used in double-layer capacitors , 1998 .

[17]  Bruce Dunn,et al.  Carbon aerogels for electrochemical applications , 1998 .

[18]  J. Newman,et al.  Experimental Investigation of a Porous Carbon Electrode for the Removal of Mercury from Contaminated Brine , 1986 .

[19]  Pei Xu,et al.  Treatment of brackish produced water using carbon aerogel-based capacitive deionization technology. , 2008, Water research.