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Study of the Interaction Between Bentonite and a Strain of Bacillus Mucilaginosus

Published online by Cambridge University Press:  01 January 2024

Yun Zhu
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China National Research Center for Geoanalysis, Beijing 100037, China
Yan Li
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Anhuai Lu*
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Haoran Wang
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Xiaoxue Yang
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Changqiu Wang
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
Weizheng Cao
Affiliation:
PetroChina Daqing Oilfield Company Ltd., Exploration and Development Research Institute, Daqing 163712, China
Qinghua Wang
Affiliation:
PetroChina Daqing Oilfield Company Ltd., Exploration and Development Research Institute, Daqing 163712, China
Xiaolei Zhang
Affiliation:
PetroChina Daqing Oilfield Company Ltd., Exploration and Development Research Institute, Daqing 163712, China
Danmei Pan
Affiliation:
State Key Lab of Structural Chemistry Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
Xiaohong Pan
Affiliation:
State Key Lab of Structural Chemistry Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Mineral-microbe interactions are widespread in a number of environmental processes such as mineral weathering, decomposition, and transformation. Both clay minerals and silicate-weathering bacteria are widely distributed in nature, and the latter contribute to weathering, diagenesis, and mineralization of major rock-forming minerals. The purpose of this study was to observe changes in the chemical composition and structure, especially the phase transformation, of smectite after processing by a silicate-weathering bacterium. The interaction between Bacillus mucilaginosus and bentonite was studied using custom culture media. Results from Inductively Coupled Plasma-Atomic Emission Spectrometry revealed that the bacterium promoted release of Si and Al from solid bentonite to solution. Concomitantly, the Ka nd Fe contents of the mineral increased as shown by X-ray photoelectron spectroscopy results. After interaction with the bacterium, the montmorillonite underwent a possible structure transformation to smectite, as indicated by the emergence of a new weak peak (d = 9.08 Å) shown by X-ray diffraction patterns. The mineralogical changes were also demonstrated by the decrease in the specific surface area of the mineral from 33.0 to 24.0 m2/g (these lower values for SSA of bentonite are related to the particle size of the smectite examined (120-160 mesh) and the weakened absorption bands in Al-O-H and Si-O-Si vibrations by Micro Fourier-transform infrared spectroscopy. The morphology changes in the bacteria observed by environmental scanning electron microscopy and atomic force microscopy revealed an obvious growth of the flagella in the presence of bentonite.

Type
Article
Copyright
Copyright © Clay Minerals Society 2011

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