Enhancement of selective adsorption of Cr species via modification of pine biomass
Zhao, Jingjing (Universitat Autònoma de Barcelona. Departament de Química)
Boada, Roberto (Universitat Autònoma de Barcelona. Departament de Química)
Cibin, Giannantonio (Diamond Light Source)
Palet i Ballús, Cristina (Universitat Autònoma de Barcelona. Departament de Química)

Fecha:	2021
Resumen:	Pine biomass (Pine), pine gasification biochar (PG) and pine biomass loaded with TiO2 (Pine/TiO2) were used as sorbent materials to remove Cr(III) or Cr(VI) ions from aqueous solutions. Our results showed that Pine/TiO2 had an improved adsorption capacity respect to Pine being the adsorption capacity for Cr(VI), 12. 8 mg/g, much larger than for Cr(III), 1. 23 mg/g. On the other hand, PG showed much higher adsorption for Cr(III), 12. 4 mg/g, than Pine/TiO2, and negligible adsorption for Cr(VI). To understand this species-dependent adsorption behavior, the adsorption mechanisms, sorbents morphology and functional sites were characterized using a multi-technique approach. The chemical state and local coordination structure of the adsorbed Cr species was studied by X-ray absorption spectroscopy (XAS). Our results show that the adsorption of Cr(III) occurred mainly through cation exchange with mineral elements in PG biochar, whereas the Cr(III) adsorption by functional groups (carboxyl and hydroxyl groups) dominate in the biomass sorbent. The enhancement of Cr(VI) adsorption in Pine/TiO2 can be explained by the presence of TiOH2+groups present in the surface of the TiO2 microparticles. X-ray absorption spectroscopy (XAS) results reveal that Cr(VI) reduces to Cr(III) after being adsorbed by the sorbent materials.
Ayudas:	Ministerio de Economía y Competitividad CTM2015-65414-C2-1-R Ministerio de Economía y Competitividad AGL2015-70393-R European Commission 730872 European Commission 665919
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Adsorption mechanism ; Biomass/biochar ; Chromium species ; Water remediation ; XAS ; Water Pollutants, Chemical/analysis ; X-Ray Absorption Spectroscopy ; Adsorption ; Biomass ; Chromium/analysis ; Charcoal ; Hydrogen-Ion Concentration ; SDG 3 - Good Health and Well-being ; SDG 6 - Clean Water and Sanitation ; SDG 12 - Responsible Consumption and Production
Publicado en:	Science of the total environment, Vol. 756 (February 2021) , art. 143816, ISSN 1879-1026

DOI: 10.1016/j.scitotenv.2020.143816
PMID: 33293091

Postprint 26 p, 1.2 MB

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