Adsorption of arsenic on multiwall carbon nanotube-zirconia nanohybrid for potential drinking water purification

Susana Addo Ntim, Somenath Mitra

Research output: Contribution to journalArticlepeer-review

122 Scopus citations

Abstract

The adsorptive removal of arsenic from water using a multiwall carbon nanotube-zirconia nanohybrid (MWCNT-ZrO 2) is presented. The MWCNT-ZrO 2 with 4.85% zirconia was effective in meeting the drinking water standard levels of 10μgL -1. The absorption capacity of the composite were 2000μgg -1 and 5000μgg -1 for As(III) and As(V) respectively, which were significantly higher than those reported previously for iron oxide coated MWCNTs. The adsorption of As(V) on MWCNT-ZrO 2 was faster than that of As(III), and a pseudo-second order rate equation effectively described the uptake kinetics. The adsorption isotherms for As(III) and As(V) fitted both the Langmuir and Freundlich models. A major advantage of the MWCNT-ZrO 2 was that the adsorption capacity was not a function of pH.

Original languageEnglish (US)
Pages (from-to)154-159
Number of pages6
JournalJournal of Colloid And Interface Science
Volume375
Issue number1
DOIs
StatePublished - Jun 1 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Keywords

  • Adsorption
  • Arsenic
  • Carbon nanotubes
  • Kinetics
  • Water
  • Zirconia

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