Data di Pubblicazione:
2019
Citazione:
In-depth study of the mechanism of heavy metal trapping on the surface of hydroxyapatite / M. Ferri, S. Campisi, M. Scavini, C. Evangelisti, P. Carniti, A. Gervasini. - In: APPLIED SURFACE SCIENCE. - ISSN 0169-4332. - 475(2019 May 01), pp. 397-409.
Abstract:
n the present study, the efficiency and selectivity and the role of surface groups of hydroxyapatite in the Cr(III)trapping, present in solution as single species or in co-presence of Ni(II) and Pb(II), have been investigated.Transmission electron microscopy (TEM) analysis and synchrotron radiation X-ray powder diffraction (XRPD) mea-surements provided comprehensive descriptions of the HAP surface and structure. The surface chemical properties,densityandstrengthoftheacidandbasesitesofHAP,havebeendeterminedby2-phenylethylamineandbenzoicacidprobeadsorption,respectively.TheamphotericpropertiesofHAPturnedovertoonlyacidpropertyinwatersolution.ThesorptioncapacityofHAPhasbeenbatch-testedinsimulatedpollutedwaterscontainingCr(III)atdifferentinitialconcentrations(fromca.0.3toca.6mM)andpHvalues(from4to9).Competitiveadsorptionphenomenainmulti-metalsystems(Cr(III)withNi(II)andPb(II))havealsobeenstudied.Anappropriatesetofanalyticaltechniques,XRPD,TEM, STEM-EDX, N2adsorption-desorption analyses, FT-IR spectroscopy, have been used to characterize the metalloaded hydroxyapatite samples. Different mechanisms of metal uptake were active depending on the nature of themetalspeciesandpHvalueofsolutions:surfacecomplexation,precipitation,ion-exchange,ordissolution-precipitation.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Hydroxyapatite; Adsorption phenomena; Inorganic materials; Heavy metal pollution; surface complexation;
Elenco autori:
M. Ferri, S. Campisi, M. Scavini, C. Evangelisti, P. Carniti, A. Gervasini
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