TY - JOUR
T1 - Enhancement of selective adsorption of Cr species via modification of pine biomass
AU - Zhao, Jingjing
AU - Boada, Roberto
AU - Cibin, Giannantonio
AU - Palet, Cristina
N1 - Funding Information:
This research was supported by grants from Spanish research projects (CTM2015-65414-C2-1-R and AGL2015-70393-R) and China Scholarship Council (201509110114). We acknowledge Diamond Light Source facility for beamtime SP18561 at B18 beamline and funding received from them to cover the trip and stay in UK. The synchrotron experiment has been supported by the project CALIPSOplus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation Horizon 2020. R.B. acknowledges funding support from the European Union's Horizon 2020 - Research and Innovation Framework Programme under the Marie Sk?odowska-Curie grant agreement No. 665919. All the authors are grateful to the UAB Microscopy Service (Servei de Microsc?pia Electr?nica from UAB, Catalunya, Spain) for the SEM analysis.
Funding Information:
This research was supported by grants from Spanish research projects ( CTM2015-65414-C2-1-R and AGL2015-70393-R ) and China Scholarship Council ( 201509110114 ). We acknowledge Diamond Light Source facility for beamtime SP18561 at B18 beamline and funding received from them to cover the trip and stay in UK. The synchrotron experiment has been supported by the project CALIPSOplus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation Horizon 2020. R.B. acknowledges funding support from the European Union's Horizon 2020 - Research and Innovation Framework Programme under the Marie Skłodowska-Curie grant agreement No. 665919 . All the authors are grateful to the UAB Microscopy Service (Servei de Microscòpia Electrònica from UAB, Catalunya, Spain) for the SEM analysis.
Publisher Copyright:
© 2020 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/2/20
Y1 - 2021/2/20
N2 - 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.
AB - 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.
KW - Adsorption mechanism
KW - Biomass/biochar
KW - Chromium species
KW - Water remediation
KW - XAS
UR - http://www.scopus.com/inward/record.url?scp=85097231472&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2020.143816
DO - 10.1016/j.scitotenv.2020.143816
M3 - Article
C2 - 33293091
AN - SCOPUS:85097231472
SN - 0048-9697
VL - 756
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 143816
ER -