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首页> 外文期刊>RSC Advances >Cyanobacterial promoted enrichment of rare earth elements europium, samarium and neodymium and intracellular europium particle formation
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Cyanobacterial promoted enrichment of rare earth elements europium, samarium and neodymium and intracellular europium particle formation

机译：蓝细菌促进的稀土元素euro，mar和钕的富集和细胞内euro颗粒的形成

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In the recovery of rare earth elements (REE) microbial biosorption has shown its theoretical ability as an extremely economically and environmentally friendly production method in the last few years. To evaluate the ability of two cyanobacterial strains, namely Anabaena spec. and Anabaena cylindrica to enrich dissolved trivalent REE, a simple protocol was followed. The REE tested in this study include some of the most prominent representatives, such as europium (Eu), samarium (Sm) and neodymium (Nd). Within the experiments, a fast decrease of the REE ~(3+) concentration in solution was tracked by inductively coupled plasma mass spectrometry (ICP-MS). It revealed an almost complete (>99%) biosorption of REE ~(3+) within the first hour after the addition of metal salts. REE ~(3+) uptake by biomass was checked using laser-induced breakdown spectroscopy (LIBS) and showed that all three selected REE ~(3+) species were enriched in the cyanobacterial biomass and the process is assigned to a biosorption process. Although the biomass stayed alive during the experiments, up to that, a distinction whether the REE ~(3+) was intra- or extracellularly sorbed was not possible, since biosorption is a metabolism independent process which occurs on living as well as non-living biomass. For europium it was shown by TEM that electron dense particles, presumably europium particles with particle sizes of about 15 nm, are located inside the vegetative cyanobacterial cells. This gave clear evidence that Eu ~(3+) was actively sorbed by living cyanobacteria. Eu ~(3+) biosorption by cell wall precipitation due to interaction with extracellular polysaccharides (EPS) could therefore be excluded. Finally, with XRD analysis it was shown that the detected europium particles had an amorphous instead of a crystalline structure. Herein, we present a fast biosorptive enrichment of the rare earth elements europium, samarium and neodymium by Anabaena spec. and Anabaena cylindrica and for the first time the subsequent formation of intracellular europium particles by Anabaena spec.
机译：在过去的几年中，在稀土元素（REE）的回收中，微生物的生物吸附已显示出其作为极其经济和环保的生产方法的理论能力。评估两个蓝细菌菌株，即鱼腥藻规格的能力。和鱼腥藻富集溶解的三价稀土元素，遵循了一个简单的协议。在这项研究中测试的REE包括一些最突出的代表，例如euro（Eu），sa（Sm）和钕（Nd）。在实验中，通过电感耦合等离子体质谱法（ICP-MS）跟踪溶液中REE〜（3+）浓度的快速降低。结果表明，在添加金属盐后的第一小时内，REE〜（3+）几乎完全（> 99％）被生物吸附。使用激光诱导击穿光谱法（LIBS）检查了生物质对REE〜（3+）的吸收，结果表明，所有三个选定的REE〜（3+）物种均富含蓝细菌生物质，并且该过程被分配为生物吸附过程。尽管生物量在实验过程中保持活性，但直到现在，仍无法区分REE〜（3+）是在细胞内还是在细胞外被吸附，因为生物吸附是一个在生命和非生命过程中均发生的与代谢无关的过程生物质。对于euro，通过TEM显示，电子致密颗粒（大概具有约15nm的粒径的euro颗粒）位于营养性蓝细菌细胞内部。这清楚地表明，Eu〜（3+）被活的蓝细菌主动吸收。因此，可以排除由于与细胞外多糖（EPS）相互作用而引起的细胞壁沉淀引起的Eu〜（3+）生物吸附。最后，通过XRD分析表明，所检测到的particles颗粒具有无定形而不是晶体结构。在本文中，我们通过Anabaena规格介绍了稀土元素euro，sa和钕的快速生物富集。和鱼腥藻，并首次通过鱼腥藻规格形成胞内euro颗粒。

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