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EnglishWe present an ecofriendly hydroxyapatite (HAP) material functionalized with tin (Sn/HAP) for an efficient interfacial reduction of Cr(VI) to Cr(III). Tin was deposited on HAP at different concentrations (from 0.2 to 1.2 mmol/g) using colloidal or clear acid solutions of SnCl2. The morphological and structural properties of fresh and used Sn/HAP samples were determined (N2 adsorption-desorption, transmission electron microscopy techniques, XRPD, XPS). Tests were performed under various conditions: at different pH 3–7, inert or oxidant atmosphere, sample aging (up to 15 days). Sn/HAP samples prepared using colloidal acid solutions revealed the best performances in the reduction of Cr(VI) to Cr(III), carried out under mild conditions (40 °C in acidified solution) with initial concentration of Cr(VI) in the range from 25 to 50 ppm. Best removal of Cr(VI) (10 mg/g) was obtained by using a Sn-concentration of 0.65 mmol/g with complete adsorption of the formed Cr(III) at HAP surface. This finding was associated with higher Sn-dispersion (surface Sn, 9.4 at.%) compared to samples prepared from clear solutions (surface, Sn 7.7 at.%), as evidenced by HAADF-STEM/EDX and XPS analyses. Remarkably, tin was tightly retained on the HAP surface under reaction conditions (0.7% leaching), confirming the occurrence of Cr(VI) reduction at solid-liquid interphase.
Combination of interfacial reduction of hexavalent chromium and trivalent chromium immobilization on tin-functionalized hydroxyapatite materials / S. Campisi, C. Evangelisti, G. Postole, A. Gervasini. - In: APPLIED SURFACE SCIENCE. - ISSN 0169-4332. - 539(2021 Feb 15).
| Titolo: | Combination of interfacial reduction of hexavalent chromium and trivalent chromium immobilization on tin-functionalized hydroxyapatite materials |
| Autori: | CAMPISI, SEBASTIANO (Primo) GERVASINI, ANTONELLA (Ultimo) (Corresponding) |
| Parole Chiave: | Hydroxyapatite; Tin; Chromium; Cr(VI) reduction; Cr(III) adsorption; Interphase process; |
| Settore Scientifico Disciplinare: | Settore CHIM/02 - Chimica Fisica Settore CHIM/03 - Chimica Generale e Inorganica Settore CHIM/04 - Chimica Industriale |
| Data di pubblicazione: | 15-feb-2021 |
| Rivista: | |
| Tipologia: | Article (author) |
| Data ahead of print / Data di stampa: | 29-ott-2020 |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.apsusc.2020.148227 |
| Appare nelle tipologie: | 01 - Articolo su periodico |
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http://hdl.handle.net/2434/781974
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