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Hexavalent chromium release over time from a pyrolyzed Cr-bearing tannery sludge.
Ghezzi, Lisa; Mugnaioli, Enrico; Perchiazzi, Natale; Duce, Celia; Pelosi, Chiara; Zamponi, Erika; Pollastri, Simone; Campanella, Beatrice; Onor, Massimo; Abdellatief, Mahmoud; Franceschini, Fabrizio; Petrini, Riccardo.
Afiliación
  • Ghezzi L; Department of Earth Science, University of Pisa, Via S. Maria 53, 56126, Pisa, Italy. lisa.ghezzi@unipi.it.
  • Mugnaioli E; Department of Earth Science, University of Pisa, Via S. Maria 53, 56126, Pisa, Italy.
  • Perchiazzi N; Department of Earth Science, University of Pisa, Via S. Maria 53, 56126, Pisa, Italy.
  • Duce C; Department of Chemistry, University of Pisa, via G. Moruzzi 13, 56124, Pisa, Italy.
  • Pelosi C; Department of Chemistry, University of Pisa, via G. Moruzzi 13, 56124, Pisa, Italy.
  • Zamponi E; Department of Earth Science, University of Pisa, Via S. Maria 53, 56126, Pisa, Italy.
  • Pollastri S; Elettra - Sincrotrone Trieste, in AREA Science Park, Basovizza, 34149, Trieste, Italy.
  • Campanella B; Institute of Chemistry of Organometallic Compounds (ICCOM-CNR) Pisa, Via G. Moruzzi 1, 56124, Pisa, Italy.
  • Onor M; Institute of Chemistry of Organometallic Compounds (ICCOM-CNR) Pisa, Via G. Moruzzi 1, 56124, Pisa, Italy.
  • Abdellatief M; SESAME Synchrotron, King Hussein Bin Talal St / Box 7, Allan, 19252, Jordan.
  • Franceschini F; Environmental Protection Agency of Tuscany (ARPAT), Via Vittorio Veneto, 56127, Pisa, Italy.
  • Petrini R; Department of Earth Science, University of Pisa, Via S. Maria 53, 56126, Pisa, Italy.
Sci Rep ; 13(1): 16283, 2023 Sep 28.
Article en En | MEDLINE | ID: mdl-37770570
Pyrolysis in an inert atmosphere is a widely applied route to convert tannery wastes into reusable materials. In the present study, the Cr(III) conversion into the toxic hexavalent form in the pyrolyzed tannery waste referred to as KEU was investigated. Ageing experiments and leaching tests demonstrated that the Cr(III)-Cr(VI) inter-conversion occurs in the presence of air at ambient temperature, enhanced by wet environmental conditions. Microstructural analysis revealed that the Cr-primary mineral assemblage formed during pyrolysis (Cr-bearing srebrodolskite and Cr-magnetite spinel) destabilized upon spray water cooling in the last stage of the process. In the evolution from the higher to the lower temperature mineralogy, Cr is incorporated into newly formed CrOOH flakes which likely react in air forming extractable Cr(VI) species. This property transforms KEU from an inert waste to a hazardous material when exposed to ordinary ambient conditions.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2023 Tipo del documento: Article País de afiliación: Italia Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sci Rep Año: 2023 Tipo del documento: Article País de afiliación: Italia Pais de publicación: Reino Unido