Trapping heavy metals by using calcium hydroxyapatite and dielectrophoresis

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 met...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-01, Vol.139 (3), p.461-466
Main Authors: Batton, John, Kadaksham, Arun John, Nzihou, Ange, Singh, Pushpendra, Aubry, Nadine
Format: Article
Language:English
Subjects:
Applied sciences
Biological and physicochemical phenomena
Calcium hydroxyapatite (HAP)
Chemical engineering
Chemical Sciences
Dielectrophoresis (DEP)
Durapatite - chemistry
Electrophoresis, Microchip
Environmental Engineering
Environmental Sciences
Exact sciences and technology
General purification processes
MEMS
Metals, Heavy - chemistry
Microfluidics
Natural water pollution
Pollution
Removal of heavy metals
Waste water filtration
Wastewaters
Water Pollutants - chemistry
Water treatment and pollution
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Summary: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.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2006.02.057