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An investigation into arsenic(V) removal from aqueous solutions by hydroxylapatite and bone-char

I. R. Sneddon^1,, H. Garelick^1,* and E. Valsami-Jones²

¹ School of Health and Social Sciences, Middlesex University, Queensway, Enfield, Middlesex EN3 4SA, UK
² Department of Mineralogy, The Natural History Museum, Cromwell Road, London, SW7 5BD, UK

^* E-mail: h.garelick{at}mdx.ac.uk

Arsenic(V) removal from aqueous solution following addition of either a mixture of synthetic hydroxylapatite and baryte or bone-char is discussed. Arsenic concentrations of 4, 10 and 100 mg/l were investigated and additions of 0.2–10 g/l of solid (hydroxylapatite, baryte or bone-char) were tested, at an initial pH of either 5 or 7. Although the mixture of hydroxylapatite and baryte had a small influence on arsenic concentrations, bone-char was found to be a very effective sorbing agent for arsenic(V). Packed-column studies to investigate the bone-char capacity, followed by leaching tests were carried out. The capacity of bone-char was found to be superior to that of granular activated carbon. The experiments presented here indicate that the mechanism involved is adsorption rather than co-precipitation.

KEYWORDS: arsenic, bone-char, hydroxylapatite, baryte, granular activated carbon, adsorption, remediation

This article has been cited by other articles:

				E. Valsami-Jones, D. A. Polya, and K. Hudson-Edwards Environmental mineralogy, geochemistry and human health Mineralogical Magazine, October 1, 2005; 69(5): 615 - 620. [Full Text] [PDF]