Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 262, Issue 1-3, Pages 175-180Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2005.04.028
Keywords
Reactive Red 4; biosorption; biomass waste; Corynebacterium glutamicum
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The protonated waste biomass of Corynebacterium glutamicum discharged from an industrial lysine fermentation plant was used as a new type of biosorbent for the removal of anionic dye Reactive Red 4. The dye uptake increased as the solution pH was decreased and at pH > 7, the uptake was negligible. The maximum uptake of dye was estimated to be 104.6 +/- 8.7 mg/g at pH 1. To identify the binding sites in the biomass, the biomass was potentiometrically titrated. As a result, three types of functional groups were present in the biomass, which was confirmed by FTIR analysis. Among functional groups, primary amine groups (-NH2) were likely the binding sites for anionic Reactive Red 4. The proton dissociated constant pK(H) and molar content of the protonated amine groups were 9.14 +/- 0.07 and 0.68 +/- 0.02 mmol/g, respectively. It was also found that carboxyl and phosphonate groups played a role in electrostatic interference with the binding of dye molecules. (c) 2005 Elsevier B.V. All rights reserved.
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