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Minerals 2018, 8(9), 406;

Comparative Analysis of Attachment to Chalcopyrite of Three Mesophilic Iron and/or Sulfur-Oxidizing Acidophiles

Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
School of Minerals Processing and Bioengineering, Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China
Biofilm Centre, Aquatische Biotechnologie, Universität Duisburg-Essen, 45141 Essen, Germany
Hunan Provincial Key Laboratory of Complex Copper Lead Zinc Associated Metal Resources Comprehensive Utilization, Hunan Research Institute of Nonferrous Metals, Changsha 410100, China
Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, 30655 Hannover, Germany
Author to whom correspondence should be addressed.
Received: 24 July 2018 / Revised: 3 September 2018 / Accepted: 12 September 2018 / Published: 14 September 2018
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Adhesion plays an important role in bacterial dissolution of metal sulfides, since the attached cells initiate the dissolution. In addition, biofilms, forming after bacterial attachment, enhance the dissolution. In this study, interactions between initial adhesion force, attachment behavior and copper recovery were comparatively analyzed for Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirillum ferrooxidans during bioleaching of chalcopyrite. The adhesion forces between bacteria and minerals were measured by atomic force microscopy (AFM). L. ferrooxidans had the largest adhesion force and attached best to chalcopyrite, while A. ferrooxidans exhibited the highest bioleaching of chalcopyrite. The results suggest that the biofilm formation, rather than the initial adhesion, is positively correlated with bioleaching efficiency. View Full-Text
Keywords: bioleaching; attachment; adhesion force; biofilm; atomic force microscopy bioleaching; attachment; adhesion force; biofilm; atomic force microscopy

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Li, Q.; Yang, B.; Zhu, J.; Jiang, H.; Li, J.; Zhang, R.; Sand, W. Comparative Analysis of Attachment to Chalcopyrite of Three Mesophilic Iron and/or Sulfur-Oxidizing Acidophiles. Minerals 2018, 8, 406.

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