期刊
BIOCHEMICAL ENGINEERING JOURNAL
卷 77, 期 -, 页码 183-189出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bej.2013.06.009
关键词
Carbon nanotubes (CNTs); Immobilization; Shewanella oneidensis MR-1; Anaerobic processes; Bioremediation; Wastewater treatment
资金
- NSFC [51278479]
- Fundamental Research Funds for the Central Universities [WK2060190010]
- Program for Changjiang Scholars and Innovative Research Team in University, China
Bioreduction of hexavalent chromium (Cr(VI)) into trivalent one (Cr(III)) based on microbial immobilization techniques has been recognized as a promising way to remove Cr contaminants from wastewater. However, such a bioreduction process is inefficient due to limited electron transfer through the immobilization matrix. In this study, a modified immobilization process was proposed by impregnating carbon nanotubes (CNTs) into Ca-alginate beads, which were then used to immobilize Shewanella oneidensis MR-1 for enhanced Cr(VI) reduction. Compared with the free cells and the beads without CNTs, the AL/CNT/cell beads showed up to 4 times higher reduction rates, mainly attributed to an enhanced electron transfer by the CNTs. In addition, the dose of CNTs greatly improved the stability of beads, suggesting a high feasibility of the AL/CNT/cell beads for repeated use. The optimized CNT concentration, temperature and pH for Cr(VI) reduction by the AL/CNT/cell beads were 0.5%, 30 degrees C and 6.0-7.0, respectively. (C) 2013 Elsevier B.V. All rights reserved.
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