Aligned nanogold assisted one step sensing and removal of heavy metal ions

Neha Chauhan, Shweta Gupta, Nahar Singh, Sukhvir Singh, Saikh S. Islam, Kedar N. Sood, Renu Pasricha

Research output: Contribution to journalArticlepeer-review

Abstract

We depict a novel strategy exploiting the chemistry of metal ion adsorption for detection and sequestration of toxic heavy metal from processed water using gold nanoparticles capped with 4-aminothiophenol. The interaction between 4-aminothiophenol capped gold nanoparticles and heavy metal ions was studied as a function of time and concentration using TEM, HRTEM, SEM, EDS, and I- V characterization. Experiments confirmed that pH is one of the crucial controlling parameters. Adsorption capacity was monitored using AAS, UV-vis spectroscopy and I- V measurement. In the absence of any alloy formation between Au and heavy metal ions, the desorption of the heavy metal ions from 4-aminothiophenol capped gold nanoparticles surface by pH modulation serves as a mean of collection of heavy metal ions. Experiments revealed that the concentration of heavy metal ions in processed water after adsorption is below the maximum permissible limit set by the WHO.

Original languageEnglish (US)
Pages (from-to)42-50
Number of pages9
JournalJournal of Colloid And Interface Science
Volume363
Issue number1
DOIs
StatePublished - Nov 1 2011

Keywords

  • 4-Aminothiophenol
  • Adsorption
  • Electrical conductivity
  • Gold nanoparticles
  • Heavy metal ions
  • Optical absorbance

ASJC Scopus subject areas

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

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