Yan Meng, Gao Qianhong, Shao Dadong
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
Sci Total Environ. 2024 Mar 1;914:169959. doi: 10.1016/j.scitotenv.2024.169959. Epub 2024 Jan 6.
Uranium is one of the sensitive radionuclides in the wastewater of nuclear powers. Due to the fact that nuclear powers are mainly located in coastal areas, the elimination of uranium (U(VI)) pollution from coastal nuclear power is ultimately rely on marine microorganisms. The fixing of U(VI) on V. alginolyticus surface or converting it into sediments is an effective elimination strategy for U(VI) pollution. In this work, typical marine microorganism V. alginolyticus was used to evaluate the elimination of U(VI) pollution by marine microorganisms. Effects of solution conditions (such as pH, temperature, and bacterium concentrations) on the physicochemical properties and elimination capabilities of V. alginolyticus were studied in detail. FT-IR, XPS and XRD results reveal that COOH, NH, OH and PO on V. alginolyticus were main functional groups for U(VI) elimination and formed (UO)(PO)·HO. The elimination of U(VI) by V. alginolyticus includes two stages of adsorption and biomineralization. The theoretical maximum adsorption capacity (C) of V. alginolyticus for U(VI) can reach up to 133 mg/g at pH 5 and 298 K, and the process reached equilibrium in 3 h. Results show that V. alginolyticus play important role in the elimination of U(VI) pollution in seawater.
铀是核电废水中的敏感放射性核素之一。由于核电站主要位于沿海地区，消除沿海核电站的铀（U(VI)）污染最终依赖于海洋微生物。将U(VI)固定在溶藻弧菌表面或将其转化为沉积物是消除U(VI)污染的有效策略。在这项工作中，使用典型的海洋微生物溶藻弧菌来评估海洋微生物对U(VI)污染的消除效果。详细研究了溶液条件（如pH值、温度和细菌浓度）对溶藻弧菌理化性质和消除能力的影响。傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和X射线衍射（XRD）结果表明，溶藻弧菌上的COOH、NH、OH和PO是消除U(VI)的主要官能团，并形成了(UO)(PO)·HO。溶藻弧菌对U(VI)的消除包括吸附和生物矿化两个阶段。在pH值为5、温度为298 K时，溶藻弧菌对U(VI)的理论最大吸附容量（C）可达133 mg/g，该过程在3小时内达到平衡。结果表明，溶藻弧菌在消除海水中的U(VI)污染方面发挥着重要作用。
