Biogenic hydroxyapatite (Apatite II™) dissolution kinetics and metal removal from acid mine drainage

Journal of Hazardous Materials
Josep OlivaJoan De Pablo

Abstract

Apatite II™ is a biogenic hydroxyapatite (expressed as Ca(5)(PO(4))OH) derived from fish bone. Using grains of Apatite II™ with a fraction size between 250 and 500 μm, batch and flow-through experiments were carried out to (1) determine the solubility constant for the dissolution reaction Ca(5)(PO(4))(3)(OH) ⇔ 5Ca(2+) + 3PO(4)(3-) + OH(-), (2) obtain steady-state dissolution rates over the pH range between 2.22 and 7.14, and (3) study the Apatite II™'s mechanisms to remove Pb(2+), Zn(2+), Mn(2+), and Cu(2+) from metal polluted water as it dissolves. The logK(S) value obtained was -50.8±0.82 at 25 °C. Far-from-equilibrium fish-bone hydroxyapatite dissolution rates decrease by increasing pH. Assuming that the dissolution reaction is controlled by fast adsorption of a proton on a specific surface site that dominates through the pH range studied, probably ≡PO(-), followed by a slow hydrolysis step, the dissolution rate dependence is expressed in mol m(-2) s(-1) as where Rate(25 °C) = -8.9 × 10(-10) × [9.96 × 10(5) × a(H+)]/[1 + 9.96 × 10(5) × a(H+)] where a(H+) is the proton activity in solution. Removal of Pb(2+), Zn(2+), Mn(2+) and Cu(2+) was by formation of phosphate-metal compounds on the Apatite II™ substrate, whereas removal ...Continue Reading

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Citations

Dec 3, 2014·Environment International·Jingying XuJurate Kumpiene
Jan 29, 2013·Journal of Hazardous Materials·A M Ramírez-PérezA Núñez-Delgado
May 5, 2016·Environmental Technology·Masahiko KatohTakeshi Sato
Oct 27, 2017·International Journal of Environmental Research and Public Health·Masahiko KatohTakeshi Sato
Oct 4, 2015·Environmental Science and Pollution Research International·Chengjie SongJingjing Liu
Feb 1, 2020·Journal of Hazardous Materials·Veerle VandeginsteJeremy Titman

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