Hydroxyapatite (HAP, Ca10(PO4)6(OH)2) is a calcium phosphate which finds application from biomedical (as prothesis coating and filler) to heterogeneous catalysis (like Guerbet reactions, thanks to HAP amphoteric surface, and redox reactions on metal functionalized HAP). HAP presents good chemical/thermal stability, water insolubility (Kps ≈ 2.34∙10-59), and the ability to exchange Ca2+ ions with several metal ions (not only bivalent). HAP sorption ability can be exploited for de-metallation of polluted wastewaters; immobilization of heavy metal cations occurs with mechanisms and efficiencies dependent on operative conditions and metal species under study. Adhering to circular economy principles, metal-loaded HAP coming from de-metallation processes could have a “second life” in catalysis. For example, copper and iron loaded HAP display interesting activity in NOx abatement, while nickel containing HAP could be exploited as electrocatalyst, promoting small molecules oxidation.

The “virtuous cycle” of hydroxyapatite : from remediation of heavy metal pollution to catalytic/electrocatalytic applications / M. Ferri, S. Campisi, M. Galloni, S. Trasatti, A. Gervasini. ((Intervento presentato al convegno ICS - INNOVATIVE CATALYSIS AND SUSTAINABILITY: Scientific and Socio-Economic Aspects International Winter School tenutosi a Bardonecchia nel 2019.

The “virtuous cycle” of hydroxyapatite : from remediation of heavy metal pollution to catalytic/electrocatalytic applications

M. Ferri;S. Campisi;M. Galloni;S. Trasatti;A. Gervasini
2019

Abstract

Hydroxyapatite (HAP, Ca10(PO4)6(OH)2) is a calcium phosphate which finds application from biomedical (as prothesis coating and filler) to heterogeneous catalysis (like Guerbet reactions, thanks to HAP amphoteric surface, and redox reactions on metal functionalized HAP). HAP presents good chemical/thermal stability, water insolubility (Kps ≈ 2.34∙10-59), and the ability to exchange Ca2+ ions with several metal ions (not only bivalent). HAP sorption ability can be exploited for de-metallation of polluted wastewaters; immobilization of heavy metal cations occurs with mechanisms and efficiencies dependent on operative conditions and metal species under study. Adhering to circular economy principles, metal-loaded HAP coming from de-metallation processes could have a “second life” in catalysis. For example, copper and iron loaded HAP display interesting activity in NOx abatement, while nickel containing HAP could be exploited as electrocatalyst, promoting small molecules oxidation.
hydroxyapatite; adsorption; wastewater remediation; air pollution; de-NOx; electrocatalysis; life cycle
Settore CHIM/02 - Chimica Fisica
Settore CHIM/03 - Chimica Generale e Inorganica
Società Chimica Italiana - Gruppo Interdivisionale di Catalisi
The “virtuous cycle” of hydroxyapatite : from remediation of heavy metal pollution to catalytic/electrocatalytic applications / M. Ferri, S. Campisi, M. Galloni, S. Trasatti, A. Gervasini. ((Intervento presentato al convegno ICS - INNOVATIVE CATALYSIS AND SUSTAINABILITY: Scientific and Socio-Economic Aspects International Winter School tenutosi a Bardonecchia nel 2019.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/815176
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