Zhang Zexin, Liu Haibo, Song Wencheng, Ma Wenjie, Hu Wei, Chen Tianhu, Liu Lei
School of Resources and Environmental Engineering, Hefei University of Technology, 230009, Hefei, PR China.
School of Resources and Environmental Engineering, Hefei University of Technology, 230009, Hefei, PR China.
J Environ Radioact. 2018 Dec;192:219-226. doi: 10.1016/j.jenvrad.2018.07.002. Epub 2018 Jul 6.
Pantoea sp. TW18 isolated from radionuclide-contaminated soils was used for the bioremediation of radionuclides pollution. Accumulation mechanism of U(VI) on Pantoea sp. TW18 was investigated by batch experiments and characterization techniques. The batch experiments revealed that Pantoea sp. TW18 rapidly reached accumulation equilibrium at approximately 4 h with a high accumulation capacity (79.87 mg g at pH 4.1 and T = 310 K) for U(VI). The accumulation data of U(VI) onto Pantoea sp. TW18 can be satisfactorily fitted by pseudo-second-order model. The accumulation of U(VI) on Pantoea sp. TW18 was affected by pH levels, not independent of ionic strength. Analysis of the FT-IR and XPS spectra demonstrated that accumulated U(VI) ions were primarily bound to nitrogen- and oxygen-containing functional groups (i.e., carboxyl, amide and phosphoryl groups) on the Pantoea sp. TW18 surface. This study showed that Pantoea sp. TW18 can be considered as a promising sorbent for remediation of radionuclides in environmental cleanup.
从受放射性核素污染的土壤中分离出的泛菌属TW18菌株被用于放射性核素污染的生物修复。通过批次实验和表征技术研究了泛菌属TW18菌株对U(VI)的积累机制。批次实验表明，泛菌属TW18菌株在约4小时内迅速达到积累平衡，对U(VI)具有较高的积累能力（在pH 4.1和T = 310 K时为79.87 mg g）。U(VI)在泛菌属TW18菌株上的积累数据可以用伪二级模型得到满意的拟合。泛菌属TW18菌株对U(VI)的积累受pH值影响，与离子强度无关。傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）分析表明，积累的U(VI)离子主要与泛菌属TW18菌株表面含氮和含氧官能团（即羧基、酰胺基和磷酰基）结合。本研究表明，泛菌属TW18菌株可被视为环境清理中修复放射性核素的一种有前景的吸附剂。
