Experimental Study on the Interaction between Pseudomonas Mendocina and Montmorillonite
Experimental Study on the Interaction between Pseudomonas Mendocina and Montmorillonite
复制标题
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Wang Rucheng
中科院分区：
文献类型：
--
作者：
Wang Rucheng
微生物广泛分布于岩石圈、水圈、土壤圈和大气中，在矿物和岩石的风化过程中起着重要作用，本研究以门多萨假单胞菌（Pseudomonasmendocina）为代表菌株，研究了微生物与含铁蒙脱石相互作用的现象和机理，分析了微生物与含铁蒙脱石作用上清液的pH值和元素含量，并对微生物与含铁蒙脱石作用的机理进行了探讨。对蒙脱石进行了X射线衍射（XRD）和红外光谱（IR）测试，结果表明，蒙脱石的pH值略有升高，Si、Al和Fe不断释放，粘土结构和表面官能团发生了轻微变化，分析结果表明，蒙脱石首先受到硅氧四面体的侵蚀，硅的溶解较为显著，同时，门多萨菌能够还原蒙脱石晶体中的Fe3+，从而将Fe2+释放到溶液中。
Microorganisms,which distribute widely in lithosphere,hydrosphere,pedosphere and atmosphere,play important roles in weathering processes of minerals and rocks.In this study,Pseudomonas mendocina wass chosen as a representative strain to investigate the phenomenon and mechanism of the interaction between microbe and Fe-containing montmorillonite.The pH value and the element contents of the supernatant was analyzed;the X-ray diffraction spectrum(XRD)and the infrared spectrum(IR)of montmorillonite were measured.The results found that the pH values increased slightly,and that Si,Al and Fe were released continuously.The results also found that the clay structure and surface functional groups were slightly changed,indicating that montmorillonite had been attacked by P.mendocina and presented as an illitization process.According to the analysis results,silico-oxygen tetrahedron tended to be attacked firstly and the dissolution of Si was relatively remarkable.At the same time,P.mendocina was able to reduce Fe3+ in the montmorillonite crystal and thus to release Fe2+ to the solution.