Geopolymers obtained by mixing metakaolin powder with tannery wastewater and NaOH pellets are proposed as 3D aluminosilicate network to chemically entrap Cr(III) species. X-ray Absorption Spectroscopy studies show the absence of toxic Cr(VI). The analysis of EXAFS also reveals a Cr(III) first coordination shell formed by 6 oxygens and a second shell of 7/8 Al or Si atoms, indicating strong bonding with the aluminosilicate network.
The coordination core and charge of chromium in Metakaolin-geopolymers as revealed by X-Ray absorption spectroscopy / Giorgetti, Marco; Berrettoni, Mario; Aquilanti, Giuliana; Boldrini, Giacomo; Lancellotti, Isabella; Leonelli, Cristina. - In: MATERIALS LETTERS. - ISSN 0167-577X. - 270:(2020), pp. 127741--. [10.1016/j.matlet.2020.127741]
The coordination core and charge of chromium in Metakaolin-geopolymers as revealed by X-Ray absorption spectroscopy
Isabella LancellottiMembro del Collaboration Group
;Cristina LeonelliMembro del Collaboration Group
2020
Abstract
Geopolymers obtained by mixing metakaolin powder with tannery wastewater and NaOH pellets are proposed as 3D aluminosilicate network to chemically entrap Cr(III) species. X-ray Absorption Spectroscopy studies show the absence of toxic Cr(VI). The analysis of EXAFS also reveals a Cr(III) first coordination shell formed by 6 oxygens and a second shell of 7/8 Al or Si atoms, indicating strong bonding with the aluminosilicate network.
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