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Chromium (VI) detoxification by oxidation and flocculation of exopolysaccharides from Arthrobacter sp. B4
- Source :
- International Journal of Biological Macromolecules. 81:235-240
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- The exopolysaccharides from Arthrobacter sp. B4 (B4-EPS) exhibited an excellent chromium (VI) (Cr(VI)) removal capability without any pH adjustment, whereby 50mgL(-1) of Cr(VI) could be completely removed by 4gL(-1) of B4-EPS. The kinetics tests revealed that the first-order rate constant was 8.3×10(-5)s(-1) and the optimal reaction time was 720min. However, a low initial concentration of Cr(VI) (5-30mgL(-1)) would accelerate the reaction rate of Cr(VI) removal and shorten reaction time to less than 360min. Meanwhile, the X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible (UV-vis) spectra indicated that Cr(VI) was reduced to Cr(III) by B4-EPS in accordance with the emergence of the green reaction products. Furthermore, the Fourier transform-infrared spectra (FT-IR) and nuclear magnetic resonance (NMR) showed that carboxyl and hydroxyl groups of B4-EPS contributed to Cr(VI) reduction. Additionally, a feasible scheme for Cr(VI) detoxification by oxidation and flocculation of B4-EPS is presented.
- Subjects :
- Chromium
Flocculation
Magnetic Resonance Spectroscopy
Chemistry
Arthrobacter sp
Polysaccharides, Bacterial
Kinetics
Inorganic chemistry
chemistry.chemical_element
General Medicine
Hydrogen-Ion Concentration
Biochemistry
Arthrobacter sp. B4
Reaction rate
Reaction rate constant
X-ray photoelectron spectroscopy
Structural Biology
Inactivation, Metabolic
Spectroscopy, Fourier Transform Infrared
Arthrobacter
Oxidation-Reduction
Molecular Biology
Subjects
Details
- ISSN :
- 01418130
- Volume :
- 81
- Database :
- OpenAIRE
- Journal :
- International Journal of Biological Macromolecules
- Accession number :
- edsair.doi.dedup.....c3e30ab8bcf6adfb362af4e12869c7ba