Improved desalination by zinc oxide nanorod induced electric field enhancement in capacitive deionization of brackish water

Karthik Laxman, Myo Tay Zar Myint, Rashid Khan, Tasneem Pervez, Joydeep Dutta

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Ion adsorption in capacitive deionization is a function of the electric field strength present at the electrode surface. We show enhancement in the electric field strength by coating activated carbon cloth (ACC) electrodes with zinc oxide (ZnO) nanorods, where the effective field was shown to vary with respect to the length, diameter and proximity of the coated ZnO nanorods. Deionization of a 17. mM NaCl solution in a single pass experiment using the composite electrodes showed a desalination efficiency of 35%, a 40% improvement as compared to plain ACC electrodes. The composite electrodes also desalinated at a charge efficiency of 78% with a salt uptake of 7.7. mg/g of the electrode. An enhancement in the ion adsorption rate led to a 30% reduction in the energy consumption per mole of salt removed for the desalination process. A theoretical model showing further enhancement in the desalination efficiency by reducing the diameter of the rods is also discussed.

Original languageEnglish
Pages (from-to)64-70
Number of pages7
JournalDesalination
Volume359
DOIs
Publication statusPublished - Mar 2 2015

Fingerprint

Zinc Oxide
Desalination
Zinc oxide
Nanorods
brackish water
desalination
electric field
electrode
zinc
Electric fields
oxide
Electrodes
Water
Activated carbon
activated carbon
Salts
Ions
salt
adsorption
Adsorption

Keywords

  • Activated carbon cloth
  • Capacitive deionization
  • Electric field
  • Finite element analysis
  • Zinc oxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Water Science and Technology
  • Mechanical Engineering

Cite this

Improved desalination by zinc oxide nanorod induced electric field enhancement in capacitive deionization of brackish water. / Laxman, Karthik; Myint, Myo Tay Zar; Khan, Rashid; Pervez, Tasneem; Dutta, Joydeep.

In: Desalination, Vol. 359, 02.03.2015, p. 64-70.

Research output: Contribution to journalArticle

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AU - Dutta, Joydeep

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AB - Ion adsorption in capacitive deionization is a function of the electric field strength present at the electrode surface. We show enhancement in the electric field strength by coating activated carbon cloth (ACC) electrodes with zinc oxide (ZnO) nanorods, where the effective field was shown to vary with respect to the length, diameter and proximity of the coated ZnO nanorods. Deionization of a 17. mM NaCl solution in a single pass experiment using the composite electrodes showed a desalination efficiency of 35%, a 40% improvement as compared to plain ACC electrodes. The composite electrodes also desalinated at a charge efficiency of 78% with a salt uptake of 7.7. mg/g of the electrode. An enhancement in the ion adsorption rate led to a 30% reduction in the energy consumption per mole of salt removed for the desalination process. A theoretical model showing further enhancement in the desalination efficiency by reducing the diameter of the rods is also discussed.

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