| 碳酸盐矿化菌对模拟放射性Sr2+的成矿作用 |
| |
| 引用本文： | 竹文坤,牟 涛,段 涛,张友魁,罗学刚.碳酸盐矿化菌对模拟放射性Sr2+的成矿作用[J].环境科学研究,2015,28(1):157-162. |
| |
| 作者姓名： | 竹文坤 牟 涛 段 涛 张友魁 罗学刚 |
| |
| 作者单位： | 1.核废物与环境安全国防重点学科实验室, 四川 绵阳 621000 |
| |
| 基金项目： | 国家自然科学基金项目(11075134);国家国防科技工业局项目(科工二司[2011]1081号);核废物与环境安全国防重点学科实验室开放基金项目(12zxnp08) |
| |
| 摘 要： | 选取碳酸盐矿化菌进行培养,利用其在代谢过程中分泌的尿素酶分解尿素产生CO32-,从而将游离态的放射性Sr2+转化为稳定态SrCO3. 通过能谱分析(EDS)、扫描电子显微镜(SEM)、X射线衍射(XRD)和傅里叶变换红外光谱(FT-IR)对沉淀产物进行分析,并计算核素固结率. 结果表明:微生物诱导沉积的沉淀为大小混杂、表面多孔的SrCO3晶体颗粒,并相互黏结形成不规则的团聚体；c(Sr2+)、ρ(尿素)及培养时间等对SrCO3晶体形貌产生影响；菌体本身作为成核位点参与了碳酸盐矿化菌诱导Sr2+的矿化过程. 当c(Sr2+)为0.05 mol/L、ρ(尿素)为30 g/L、pH为8.0并在30 ℃下培养72 h时,生成较大的微生物矿化物团聚体,对Sr2+固结率可达98.32%,可实现放射性核素稳定化处置.
|
| 关 键 词： | 碳酸盐矿化菌 核素Sr2+ 矿化 |
| 收稿时间： | 2014/1/13 0:00:00 |
| 修稿时间： | 2014/4/9 0:00:00 |
Metallogenesis of Simulated Radioactive Sr2+ by Carbonate-Mineralization Bacteria |
| |
| ZHU Wenkun,MU Tao,DUAN Tao,ZHANG Youkui and LUO Xuegang.Metallogenesis of Simulated Radioactive Sr2+ by Carbonate-Mineralization Bacteria[J].Research of Environmental Sciences,2015,28(1):157-162. |
| |
| Authors: | ZHU Wenkun MU Tao DUAN Tao ZHANG Youkui and LUO Xuegang |
| |
| Affiliation: | 1.Fundamental Science on Nuclear Waste and Environmental Security Laboratory, Mianyang 621000, China2.China Academy of Engineering Physics, Mianyang 621000, China |
| |
| Abstract: | The solidifying of Sr2+ by carbonate mineralization bacteria, Bacillus pasteurii, in an aqueous solution was investigated. CO32- was produced by the enzyme digestion process of the species when urea was decomposing. Biochemical properties of urease from bacteria were involved in transforming free radioactive Sr2+ into stable SrCO3. Various analysis and testing techniques, such as EDS, SEM, XRD and FT-IR, were used to analyse the precipitate. The experimental results showed that the microbiologically-induced SrCO3 crystal particles have porous surface in chaotic sizes, bonding together forming irregular groups. Concentrations, cultivation time and urea concentrations of Sr2+ influenced the forming of SrCO3 crystal morphology. It was also found that the bacteria participate in the progress of carbonate mineralization bacteria induced Sr2+ mineralization as nucleation sites. The solidifying rate reached a peak of 98.32% when the Sr2+ concentration was set as 0.05 mol/L, urea concentration was 30 g/L and pH was 8, cultivation was at 30 ℃ for 72 h, and therefore radionuclide stabilization treatment could be achieved. |
| |
| Keywords: | carbonate-mineralization bacteria nuclide Sr2+ mineralization |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《环境科学研究》浏览原始摘要信息 |
|
点击此处可从《环境科学研究》下载全文 |
|
