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当前位置: 首页 > 文章 > 柠檬酸杆菌对U(Ⅵ)的去除效应及机理研究 核农学报 2015,29 (9) 1774-1781
Position: Home > Articles > The Removal Effect and Mechanism of Citrobacter freundii on U(Ⅵ) Journal of Nuclear Agricultural Sciences 2015,29 (9) 1774-1781

柠檬酸杆菌对U(Ⅵ)的去除效应及机理研究

作  者：
刘小玲;陈晓明;宋收;张倩;郝希超
单  位：
西南科技大学生命科学与工程学院西南科技大学核废物与环境安全国防重点学科实验室;西南科技大学生命科学与工程学院;西南科技大学
关键词：
柠檬酸杆菌;U(Ⅵ);去除效应;红外光谱;扫描电子显微镜-能量色散X射线光谱
摘  要：
为了探索柠檬酸杆菌对U(Ⅵ)的去除效应及机理,考察了p H值、温度、U(Ⅵ)初始浓度等对该菌株去除U(Ⅵ)的影响,并运用红外光谱(FTIR)与扫描电子显微镜-能量色散X射线光谱(SEMEDX)分析了柠檬酸杆菌与U(Ⅵ)作用后官能团、形貌及元素组成的变化。结果表明:当p H值7.0,温度30℃,U(Ⅵ)初始浓度10 mg·L-1时,柠檬酸杆菌对其去除率可达到94.5%;当U(Ⅵ)初始浓度为30 mg·L-1时,去除率也可达到92.1%。FTIR分析表明,柠檬酸杆菌中与U(Ⅵ)相互作用的基团主要包括-OH、-C=O、-PO43-、-NH2等基团。SEM-EDX结果表明,柠檬酸杆菌与U(Ⅵ)作用后细胞表面出现褶皱,不规则,大量片状晶体和颗粒物;Na、Mg、Ca元素含量均降低,新出现了P和U峰,且P∶U∶Ca为0.88%∶0.69%∶0.48%。综上所述,溶液p H值、温度、U(Ⅵ)初始浓度对柠檬酸杆菌去除U(Ⅵ)有明显影响;柠檬酸杆菌与U(Ⅵ)的作用机理较复杂,主要与细胞基团、无机离子与UO22+的交换作用及微生物的矿化作用有关,这为利用柠檬酸杆菌去除核素的研究提供了依据。
译  名：
The Removal Effect and Mechanism of Citrobacter freundii on U(Ⅵ)
作  者：
LIU Xiaoling;CHEN Xiaoming;SONG Shou;ZHANG Qian;HAO Xichao;LUO Xuegang;School of Life Science and Engineering,Southwest University of Science and Technology;Xuan Han Institute of edible fungi;Key Lab of National Defense of China,Southwest University of Science and Technology;
关键词：
Citrobacter freundii,U(Ⅵ),the removal effect,fourier transform infrared spectroscopy,scanning electron microscopy-X-ray energy d
摘  要：
In order to explore the removal effect and mechanism of Citrobacter freundii on U( Ⅵ),the influence factors including p H value,temperature and the initial concentration of U( Ⅵ) were discussed in this research. The analysis technology of fourier transform infrared spectroscopy( FTIR) and scanning electron microscopy-X-ray energy dispersive analysis( SEM-EDX) were used to investigate the removal mechanism of Citrobacter freundii to U( Ⅵ). The changes of molecular functional groups,cell morphology and elemental composition were analyzed after the strains interacting with U(Ⅵ). The results showed that the optimum removals indexes about Citrobacter freundii removal U(Ⅵ) were p H value7. 0,temperature 30℃ and the initial U( Ⅵ) concentration 10 mg·L- 1. Under such condition,the maximum removal rate of U( Ⅵ) by Citrobacter freundii strain could be up to 94. 5%. And at the initial U( Ⅵ) concentration 30mg·L- 1,the removal rate of U(Ⅵ) also could reach to 92. 1%. By FTIR analysis,the main molecular functional groups of Citrobacter freundii interacting with U( Ⅵ),included- OH,- C = O,- PO43-,- NH2,etc. Under SEMEDX graphic,cell surface appeared to be folded,and there were large amount of lamellar crystals and particulate matter after the Citrobacter freundii contracting with U( Ⅵ). The element contents of Na,Mg,Ca declined under SEM-EDX analysis. Two new peaks of P and U were appeared at the bacterial cell wall,and the atomic ratio of P ∶ U ∶ Ca was0. 88% ∶ 0. 69% ∶ 0. 48%,respectively. In conclusion,the removal effect of Citrobacter freundiiis on U( Ⅵ) was affected by p H value,temperature,the initial U( Ⅵ) concentration. The removal mechanism to U( Ⅵ) was complicated. The main removal way of U( Ⅵ) was the interaction of cell group, ion exchange role of inorganic ions, microbial mineralization,and it provided theoretical basis for the using of Citrobacter freundii to remove nuclides.

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