title: Brewers draff as a new low-cost sorbent for chromium (VI): comparison with other biosorbents.
abstract: In this study, used brewers draff was investigated as a novel sorbent for Cr(VI) and compared with other biosorbents (grape waste, peat moss, and sawdust). FTIR-ATR, BET analysis, and pHPZC determination were used to characterize the sorbents. Kinetic and equilibrium experiments were performed, and two empirical models, Langmuir and Freundlich, were used to describe Cr adsorption. Additionally, packed bed column experiments were also performed. In order to identify possible reduction processes, ion exchange separation on the AG1-X8 resin was used to separate the anionic Cr(VI) and the reduced cationic Cr(III) from the aqueous phase after biosorption. Cr(VI) removal was pH-dependent and fitted well both the Langmuir and the Freundlich isotherm models. The ion exchange separation showed that Cr(VI) reduction had occurred in the solution during biosorption. The efficiency of draff as a biosorbent was comparable (or even higher) to highly organic materials (e.g., composted peat), showing its potential application for Cr(VI) decontamination.
authors: Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Praha 6, Czech Republic. sillerovah@fzp.czu.cz
authors: Hana
authors: H
authors: Sillerová
authors: Michael
authors: M
authors: Komárek
authors: Vladislav
authors: V
authors: Chrastný
authors: Martin
authors: M
authors: Novák
authors: Aleš
authors: A
authors: Vaněk
authors: Ondřej
authors: O
authors: Drábek
mesh_terms: D000327:Adsorption; D002852:Chromatography, Ion Exchange; D002857:Chromium / Q000737:chemistry / Q000302:isolation & purification*; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010084:Oxidation-Reduction; D012987:Soil; D027843:Vitis; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D014934:Wood
chemical_list: D012987:Soil; D014874:Water Pollutants, Chemical; D002857:Chromium