Potential of Salvinia auriculata biomass as biosorbent of the Cr(III): directed chemical treatment, modeling and sorption mechanism study.
In this work, the mechanism of the Cr(III) sorption by Salvinia auriculata biosorbent was studied in two stages. To understand the influence of the sorption parameters on the Cr(III) uptake, preliminary tests were performed. First, S. auriculata biomass was separately treated with base and acid solutions. Second, acid and base treatment of samples was performed based on the knowledge data base of our group. It was achieved a higher Cr(III) sorption capacity above 15 mg g-1 as associated to an increase of the micro-pores specific area and biosorbent volume. The obtained kinetic data of raw and treated biosorbents were well described by the intra-particle diffusion model. In this model, Cr(III) adsorption onto treated biomass is progressively improved with appearing of different mass transfer zones from out layer up to micro-porous layers. The equilibrium data of raw biomass were best described by the Langmuir isotherm, whereas the equilibrium data of the treated biomass were best fit by a combination of both Langmuir and Dubinin-Radushkevich isotherms. At low concentrations the adsorption most likely occurred on the outer monolayer, as proposed by the Langmuir model, followed by the adsorption on the micro-porous layers, as validated by the Dubinin-Radushkevich isotherm.
a Postgraduate Program of Chemical Engineering , West Paraná State University , Toledo , PR , Brazil.
Aparecido Nivaldo
AN
Módenes
b Postgraduate Program of Chemical Engineering , Maringá State University , Maringá , PR , Brazil.
Ana Paula
AP
de Oliveira
a Postgraduate Program of Chemical Engineering , West Paraná State University , Toledo , PR , Brazil.
Fernando R
FR
Espinoza-Quiñones
a Postgraduate Program of Chemical Engineering , West Paraná State University , Toledo , PR , Brazil.
Daniela Estelita Goes
DEG
Trigueros
c The 'Stephan Angeloff' Institute of Microbiology-Bulgarian Academy of Sciences , Sofia , Bulgaria.
Alexander Dimitrov
AD
Kroumov
a Postgraduate Program of Chemical Engineering , West Paraná State University , Toledo , PR , Brazil.
Carlos Eduardo
CE
Borba
a Postgraduate Program of Chemical Engineering , West Paraná State University , Toledo , PR , Brazil.
Camila Larissa
CL
Hinterholz
b Postgraduate Program of Chemical Engineering , Maringá State University , Maringá , PR , Brazil.
Rosângela
R
Bergamasco
D000327:Adsorption; D018533:Biomass; D002857:Chromium / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D064028:Tracheophyta / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D014874:Water Pollutants, Chemical; D002857:Chromium
Biosorption; chromium; combination of sorption isotherms; intra-particle diffusion model; macrophytes