Carbon nanotubes promote Cr(VI) reduction by alginate-immobilized Shewanella oneidensis MR-1 |
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| Affiliation: | 1. State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China;3. College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China;4. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China;1. China University of Mining and Technology, China;2. Xuzhou Institute of Technology, Xuzhou 221116, China;1. School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, Fujian Province, China;2. Environmental Contaminants Group, Future Industries Institute, University of South Australia, Mawson, Lakes, SA, 5095, Australia;1. Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China;4. Norwegian Geotechnical Institute (NGI), P.O. Box 3930, Ullevål Stadion, N-0806 Oslo, Norway;5. School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK;1. Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India;2. Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India;3. Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India |
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| Abstract: | 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 °C and 6.0–7.0, respectively. |
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| Keywords: | Carbon nanotubes (CNTs) Immobilization Anaerobic processes Bioremediation Wastewater treatment |
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