Study of the involved sorption mechanisms of Cr(VI) and Cr(III) species onto dried Salvinia auriculata biomass.

Autor: Módenes AN; Postgraduate Program of Chemical Engineering, West Paraná State University, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil. Electronic address: anmodenes@yahoo.com.br., de Oliveira AP; Postgraduate Program of Chemical Engineering, Maringá State University, Av. Colombo 5790, 87020-900, Maringá, PR, Brazil., Espinoza-Quiñones FR; Postgraduate Program of Chemical Engineering, West Paraná State University, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil., Trigueros DEG; Postgraduate Program of Chemical Engineering, West Paraná State University, Rua da Faculdade 645, Jd. Santa Maria, 85903-000, Toledo, PR, Brazil., Kroumov AD; The 'Stephan Angeloff' Institute of Microbiology-Bulgarian Academy of Sciences, Acad. G. Bonchev str., Bl. 26, Sofia, 1113, Bulgaria., Bergamasco R; Postgraduate Program of Chemical Engineering, Maringá State University, Av. Colombo 5790, 87020-900, Maringá, PR, Brazil.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2017 Apr; Vol. 172, pp. 373-383. Date of Electronic Publication: 2017 Jan 05.
DOI: 10.1016/j.chemosphere.2017.01.038
Abstrakt: Removal of Cr(VI) species by dried biomass of the aquatic macrophyte Salvinia auriculata was studied in order to understand the involved sorption mechanisms. Kinetic tests were carried out under the conditions such as concentration range of Cr(VI) from 50 to 250 mg L -1 and a temperature of 30 °C. Modification of the biosorbent by the presence of Cr(VI) species was assessed by analysis of its porosity, density and infrared molecular absorption spectrum. A series of experimental approaches involving directed chemical modifications on the biosorbent surface was performed. The main functional groups involved in the sorption mechanisms were identified. The gas sorption analyser was applied and proved that a strong chemical effect of Cr(VI) species on the surface took place, resulting in a leaching organic matter with an obvious and significant increase in the porosity parameters. The intra-particle diffusion model revealed different mass transfer zones into the adsorbent during Cr(VI) removal. New combined Langmuir and Dubinin-Radushkevich isotherm was the best to fit the equilibrium data of Cr(VI) species removal. Finally, Cr(VI) removal was mainly mediated by a redox process where Cr(III) species were formed.
(Copyright © 2017 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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