Abstract:To compare the similarities and differences of adsorption properties and adsorption properties during interaction of microorganisms with uranium, we selected Bacillus subtilis (bacteria), yeast (fungus), chlorella (algae) as objects and studied the adsorption performance and a variety of microbial factors by using scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results indicated that three types of microorganisms in water uranium has good effect on uranium adsorption. The best adsorption rate of uranium by yeast and chlorella and Bacillus subtilis were 97.19%、97.13% and 98.03%, respectively. And the maximum adsorption capacity of uranium by yeast and chlorella and Bacillus subtilis were 341.2、356.5、512.5mgU/g(DW) , respectively. The adsorption process and mechanism for uranium adsorption by three kinds of microbe was different, yeast and chlorella in line with the Langmuir model, bacillus subtilis is more suitable for the Freundlich model. The results of Scanning electron microscope and energy spectrum indicated that the uranium is adsorbed onto the cell surface at the beginning with no precipitation or mineral. Then, the sheet and clumps of uranium- phosphorus crystallization were formed on the surface of yeast after 12hours.however, There were not found the similar crystals on the surface of chlorella and bacillus subtilis. Interaction of microorganisms with uranium will cause changes in cell morphology, especially for bacillus subtilis and chlorella.
马佳林, 聂小琴, 董发勤, 代群威, 张东, 杨杰, 周娴, 黄荣, 龚俊源, 龚运军. 三种微生物对铀的吸附行为研究[J]. 中国环境科学, 2015, 35(3): 825-832.
MA Jia-Lin, NIE Xiao-Qin, DONG Fa-Qin, DAI Qun-Wei, ZHANG Dong, YANG Jie, ZHOU Xian, HUANG Rong, GONG Jun-Yuan, GONG Yun-Jun. The adsorption behavior on uranium by three kinds of microorganisms. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(3): 825-832.