((東北大學 資源與土木工程學院，沈陽 110004))
摘 要: 運用吸附量測定、ζ-電位研究、紅外光譜和X射線光電子能譜分析，探討Mycobacterium Phlei在黃鐵礦和方鉛礦表面的選擇性吸附作用機理。結果表明，在其他實驗條件固定的情況下，當溶液的初始pH值大于5時，Mycobacterium Phlei在黃鐵礦表面的吸附量遠遠大于方鉛礦；靜電作用不是致使Mycobacterium Phlei在黃鐵礦和方鉛礦表面產(chǎn)生選擇性吸附的主要作用力；Mycobacterium Phlei細胞表面的C、N和O元素通過礦物表面的Fe，Pb和S元素與礦物表面發(fā)生了化學吸附，而且與黃鐵礦表面元素的作用程度大于方鉛礦。礦物的表面結構及其性質、細胞表面基團與礦物表面金屬離子的鍵合作用大小可能是致使Mycobacterium Phlei產(chǎn)生選擇性吸附的主要 原因。
關鍵字: Mycobacterium Phlei；黃鐵礦；方鉛礦；選擇性吸附作用機理；ζ-電位；光譜
（(School of Resource and Civil Engineering, Northeastern University, Shenyang 110004, China)）
Abstract:By means of adsorption rate measurement, zeta-potential, infrared spectroscopy and X-ray photoelectron spectroscopy, the mechanism of selective adsorption of Mycobacterium Phlei on the surfaces of pyrite and galena was studied. The results show that Mycobacterium Phlei adsorbs preferentially on pyrite than on galena when pH is over 5 and other parameters are fixed, which is also observed by scanning electron microscopy. Static force is not the main function to make Mycobacterium Phlei has an obvious selective adsorption on the surfaces of pyrite and galena from the zeta potential. IR and XPS results indicate that chemical adsorption occurred on the surfaces of two minerals by Fe, Pb and S, and the reaction degree of elements C, N and O on the surface of Mycobacterium Phlei to surface elements of pyrite is larger than that of galena. It is concluded that the crystal frame and surface property of two minerals and the linking between groups on the surface of Mycobacterium Phlei and metal ions on the surface of two minerals are main factors that cause the selective adsorption of Mycobacterium Phlei.
Key words: Mycobacterium Phlei; pyrite; galena; selective adsorption mechanism; zeta-potential; spectroscopy
