Department of Environmental Sciences and Engineering, Fuzhou University, Fuzhou, China.
Department of Geology and Environmental Earth Sciences, Miami University, Oxford, USA.
Environ Sci Pollut Res Int. 2018 Aug;25(23):22334-22339. doi: 10.1007/s11356-017-9691-0. Epub 2017 Jul 11.
A large number of rare earth element mining and application resulted in a series of problems of soil and water pollution. Environmental remediation of these REE-contaminated sites has become a top priority. This paper explores the use of Bacillus licheniformis to adsorb lanthanum and subsequent mineralization process in contaminated water. The maximum adsorption capacity of lanthanum on bacteria was 113.98 mg/g (dry weight) biomass. X-ray diffraction (XRD) and transmission electron microscopy (TEM) data indicated that adsorbed lanthanum on bacterial cell surface occurred in an amorphous form at the initial stage. Scanning electron microscopy with X-ray energy-dispersive spectroscopy (SEM/EDS) results indicated that lanthanum adsorption was correlated with phosphate. The amorphous material was converted into scorpion-like monazite (LaPO nanoparticles) in a month. The above results provide a method of using bacterial surface as adsorption and nucleation sites to treat REE-contaminated water.
大量的稀土元素开采和应用导致了一系列的水土污染问题。这些 REE 污染场地的环境修复已成为当务之急。本文探讨了利用地衣芽孢杆菌吸附水中镧及随后的矿化过程。细菌对镧的最大吸附容量为 113.98mg/g（干重）生物质。X 射线衍射（XRD）和透射电子显微镜（TEM）数据表明，细菌表面吸附的镧在初始阶段以无定形形式存在。扫描电子显微镜与 X 射线能量色散谱（SEM/EDS）的结果表明，镧的吸附与磷酸盐有关。一个月内，无定形物质转化为蝎子状独居石（LaPO 纳米粒子）。上述结果为利用细菌表面作为吸附和成核位点处理 REE 污染水提供了一种方法。
