Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 81, Issue -, Pages 235-240Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2015.07.013
Keywords
Exopolysaccharides; Chromium (VI); Detoxification
Funding
- National Natural Science Foundation of China [31300045, 31370090]
- Science and Technology Development Plan Project of Shandong Province, China [2013GSF12006]
- Foundation of University of Jinan [XKY1324]
- Xinjiang Production & Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basinand [BYBR1405, YE13]
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The exopolysaccharides from Arthrobacter sp. B4 (B4-EPS) exhibited an excellent chromium (VI) (Cr(VI)) removal capability without any pH adjustment, whereby 50 mg L-1 of Cr(VI) could be completely removed by 4g L-1 of B4-EPS. The kinetics tests revealed that the first-order rate constant was 8.3 x 10(-5) s(-1) and the optimal reaction time was 720 min. However, a low initial concentration of Cr(VI) (5-30 mg L-1) would accelerate the reaction rate of Cr(VI) removal and shorten reaction time to less than 360 min. 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. (C) 2015 Elsevier B.V. All rights reserved.
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