The mechanism of uranium biosorption by Rhizopus arrhizus
The mechanism of uranium biosorption by Rhizopus arrhizus
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DOI：
10.1002/bit.260240211
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发表时间：
1982-02
影响因子：
3.8
通讯作者：
M. Tsezos;B. Volesky
中科院分区：
文献类型：
--
作者：
M. Tsezos;B. Volesky
元素的生物吸附是一种很少被理解的现象，某些类型的甚至是无生命的微生物生物质也表现出这种现象。一种常见的真菌少根根霉（Rhizopus arrhizus）据报道从水溶液中吸收铀的程度为180 mg U6+/g。利用电子显微镜、X射线能量色散分析、红外光谱等实验技术研究了这种类型的生物质的铀螯合机制，并获得了至少由三个过程组成的生物吸附机制的支持证据。细胞壁几丁质结构中的铀配位和吸附同时快速发生，而几丁质微晶细胞壁结构中的氢氧化铀的沉淀以较低的速率发生。Fe ~（2+）和Zn ~（2+）共存离子对铀的生物吸附有干扰作用。
Biosorption of elements is a little understood phenomenon exhibited by some types of even nonliving microbial biomass. A common fungus Rhizopus arrhizus has been reported to take up uranium from aqueous solutions to the extent of 180 mg U6+/g. The mechanism of uranium sequestering by this type of biomass was studied by using experimental techniques such as electron microscopy, x‐ray energy dispersion analysis, IR spectroscopy, and supporting evidence was obtained for a biosorption mechanism consisting of at least three processes. Uranium coordination and adsorption in the cell‐wall chitin structure occur simultaneously and rapidly whereas precipitation of uranylhydroxide within the chitin microcrystalline cell‐wall structure takes place at a lower rate. Interference of Fe2+ and Zn2+ coions with uranium biosorption is indicated.