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首页> 外文期刊>Environmental Science & Technology >Recovery of Rare Earth Elements from Geothermal Fluids through Bacterial Cell Surface Adsorption
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Recovery of Rare Earth Elements from Geothermal Fluids through Bacterial Cell Surface Adsorption

机译：通过细菌细胞表面吸附从地热流体中回收稀土元素

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摘要

The increasing demand for rare earth elements (REEs) in the modern economy motivates the development of novel strategies for cost-effective REE recovery from non-traditional feedstocks. We previously engineered E. coli to express lanthanide binding tags on the cell surface, which increased the REE biosorption capacity and selectivity. Here we examined how REE adsorption by the engineered E. coli is affected by various geochemical factors relevant to geothermal fluids, including total dissolved solids (TDS), temperature, pH, and the presence of specific competing metals. REE biosorption is robust to TDS, with high REE recovery efficiency and selectivity observed with TDS as high as 165,000 ppm. Among several metals tested, U, Al, and Pb were found to be the most competitive, causing 25% reduction in REE biosorption when present at concentrations to similar to 3- to11-fold higher than the REEs. Optimal REE biosorption occurred between pH 5-6, and sorption capacity was reduced by similar to 65% at pH 2. REE recovery efficiency and selectivity increased as a function of temperature up to similar to 70 degrees C due to the thermodynamic properties of metal complexation on the bacterial surface. Together, these data define the optimal and boundary conditions for biosorption and demonstrate its potential utility for selective REE recovery from geofluids.
机译：现代经济中对稀土元素（REEs）的需求不断增长，促使人们开发出从非传统原料中回收具有成本效益的REE的新策略。我们以前对大肠杆菌进行了改造，使其在细胞表面表达镧系元素结合标签，从而提高了REE的生物吸附能力和选择性。在这里，我们检查了工程化大肠杆菌对REE的吸附如何受到与地热流体有关的各种地球化学因素的影响，包括总溶解固体（TDS），温度，pH值和特定竞争金属的存在。 REE生物吸附对TDS稳健，在高达165,000 ppm的TDS上观察到高REE回收效率和选择性。在几种测试的金属中，U，Al和Pb具有最强的竞争力，当以比REE高出3到11倍的浓度存在时，会导致REE生物吸附降低> 25％。最佳的REE生物吸附发生在pH 5-6之间，并且在pH 2下的吸附能力降低了约65％。由于金属络合的热力学性质，REE的回收效率和选择性随温度升高而升高，直至接近70摄氏度。在细菌表面上。这些数据共同定义了生物吸附的最佳条件和边界条件，并证明了其对从地流体中选择性回收REE的潜在效用。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7714-7723|共10页
  • 作者

    Brewer Aaron; Chang Elliot; Park Dan M.; Kou Tianyi; Li Yat; Lammers Laura N.; Jiao Yongqin;

  • 作者单位

    Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA|Univ Washington, Dept Earth & Space Sci, Seattle, WA 98185 USA;

    Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94270 USA;

    Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA;

    Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA;

    Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA;

    Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94270 USA;

    Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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