Phosphate promotes uranium (VI) adsorption in Staphylococcus aureus LZ‐01
Phosphate promotes uranium (VI) adsorption in Staphylococcus aureus LZ‐01
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DOI：
10.1111/lam.12310
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发表时间：
2014-11
影响因子：
2.4
通讯作者：
Luming Zou;Zhenjiang Chen;Xiaowei Zhang;Pu Liu;Xiangkai Li
中科院分区：
文献类型：
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作者：
Luming Zou;Zhenjiang Chen;Xiaowei Zhang;Pu Liu;Xiangkai Li
金黄色葡萄球菌LZ-01是从黄河兰州上游分离到的一株能抵抗铬(VI)并将其还原为铬(III)的菌株。研究了菌株LZ-01‘S对铀(VI)的抗性和吸附能力。结果表明，它能抵抗2 mmoL L−1U(VI)，6h后能吸附96%的2 mmoL L−1U(VI)。透射电子显微镜图像显示细胞表面有沉淀物形成。能量色散X射线能谱(EDX)分析表明，沉淀中含有铀和磷。20mmoL L−-1磷酸盐可提高菌株LZ-01对铀(VI)的吸附速率。30min内对2.5mmolL−1U(VI)的吸收率为45%，而不加磷酸盐时的吸收率为36%(P<；0.05)。菌株LZ-01能抵抗重金属，并能在核废料污染的环境中存活。菌株LZ-01可能是添加磷酸盐的核废物修复的潜在候选者。
Staphylococcus aureus LZ‐01 was isolated from the Yellow River upstream from Lanzhou which can resist and reduce chromium (VI) to chromium (III). In this study, strain LZ‐01's uranium (VI) resistance and adsorption abilities were investigated. Our results showed that it can resist 2 mmol l−1 U(VI) and adsorb 96% of 2 mmol l−1 U(VI) after 6 h incubation. Transmission electron microscopy (TEM) images showed that precipitates were formed on the surface of the cells. Energy dispersive X‐ray spectroscopy (EDX) analysis indicated that the precipitates contained uranium and phosphorus. The U(VI) adsorption rate of strain LZ‐01 was promoted by 20 mmol l−1 phosphate. It adsorbed 45% of 2·5 mmol l−1 U(VI) in 30 min compared to 36% without phosphate (P < 0·05). Strain LZ‐01 can resist heavy metals and survive in nuclear waste‐contaminated environments. Strain LZ‐01 might be a potential candidate for nuclear waste remediation with phosphate added.