Effect of exopolymers on oxidative dissolution of natural rhodochrosite by Pseudomonas putida strain MnB1: An electrochemical study |
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| Institution: | 1. Laboratory of Environmental Pollution and Bioremediation, State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Department of Zoology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;5. Department of Zoology, Faculty of Life and Earth Science, Rajshahi University, Rajshahi 6205, Bangladesh;1. College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, China;2. Laboratory of Environment Remediation and Function Material, Suzhou Research Institute of North China Electric Power University, Suzhou, Jiangsu, 215213, China;3. Suzhou University of Science and Technology, Suzhou, Jiangsu, 215009, China;4. Key Laboratory of Western China’s Environmental Systems (Ministry of Education) and Gansu Engineering Center of Technology and Equipment for Fine Particles Pollution Control, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China;1. Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Material and Chemical Engineering College, Hainan University, Haikou 570228, China;2. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. Graduate School of Environmental Science, Hokkaido University, Kita-ku, Sapporo 060-0810, Japan;2. Division of Environmental & Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Mail Code HRC3, 3181 SW Sam Jackson Park Road, Portland, OR 97239-3098, United States;1. Laboratório de Bioquímica e Biologia Molecular, Departamento de Ciências Biológicas (DECBI) & Núcleo de Pesquisa em Ciências Biológica (NUPEB), Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil;2. Laboratório de Bio & Hidrometalurgia, Departamento de Engenharia Metalúrgica e de Materiais (DEMET), Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil |
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| Abstract: | Oxidative dissolution of natural rhodochrosite by the Mn(II) oxidizing bacterium Pseudomonas putida strain MnB1 was investigated based on batch and electrochemical experiments using natural rhodochrosite as the working electrode. Tafel curves and batch experiments revealed that bacterial exopolymers (EPS) significantly increased dissolution of natural rhodochrosite. The corrosion current significantly increased with reaction time for EPS treatment. However, the corrosion process was blocked in the presence of cells plus extra EPS due to formation of the passivation layer. Moreover, the scanning electron microscopy and the energy dispersive spectroscopy (SEM–EDS) results showed that the surface of the natural rhodochrosite was notably changed in the presence of EPS alone or/and bacterial cells. This study is helpful for understanding the role of EPS in bacterially oxidation of Mn(II). It also indicates that the Mn(II) oxidizing bacteria may exert their effects on Mn(II) cycle and other biological and biogeochemical processes much beyond their local ambient environment because of the catalytically dissolution of solid Mn(II) by EPS and the possible long distance transport of the detached EPS. |
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