Trapping heavy metals by using calcium hydroxyapatite and dielectrophoresis

John Batton, Arun John Kadaksham, Ange Nzihou, Pushpendra Singh, Nadine Aubry

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We propose a novel technique for the removal of heavy metal waste from contaminated water. Our method consists in using dielectrophoresis (DEP) to trap hydroxyapatite (HAP) particles of 1 μm size in water after they have adsorbed heavy metal (Pb, Zn, Cu, Co and Cr). Although HAP can adsorb heavy metals in water and as such offers great promise as a waste-cleaning tool [1-3], one of the current challenges is the efficient removal of the HAP particles once they have adsorbed the heavy metals. We show in this paper that DEP can be used to concentrate such particles in certain regions, thus rendering the rest of the solution volume nearly free of contaminated particles. We present here both experimental and numerical results for suspensions at low concentrations.

Original languageEnglish (US)
Pages (from-to)461-466
Number of pages6
JournalJournal of Hazardous Materials
Volume139
Issue number3
DOIs
StatePublished - Jan 31 2007

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Keywords

  • Calcium hydroxyapatite (HAP)
  • Dielectrophoresis (DEP)
  • MEMS
  • Microfluidics
  • Removal of heavy metals
  • Waste water filtration

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