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
Berrettoni M.
Secondo
;Boldrini G.;
2020-01-01
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.File in questo prodotto:
| File | Dimensione | Formato | |
|---|---|---|---|
|
Materials Letters 270 (2020) 127741.pdf
solo gestori di archivio
Tipologia:
Versione Editoriale
Licenza:
NON PUBBLICO - Accesso privato/ristretto
Dimensione
418.36 kB
Formato
Adobe PDF
|
418.36 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
