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首页> 外文期刊>Environmental Science & Technology >Size-Dependent Pb Sorption to Nanohematite in the Presence and Absence of a Microbial Siderophore
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Size-Dependent Pb Sorption to Nanohematite in the Presence and Absence of a Microbial Siderophore

机译：在存在和不存在微生物铁载体的情况下，对纳米赤铁矿的尺寸依赖性铅吸附

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摘要

This study focused on the effects of particle size (40, 8.6, and 3.6 run) and the presence of the microbial ligand desferrioxamine B (DFOB) on Pb(II) sorption to hematite, based on sorption edge experiments (i.e., sorption as a function of pH). Effects of hematite nanopartide size on sorption edges, when plotted either as sorption density or as % Pb uptake, depended on whether the experiments were normalized to account for differences in specific surface area within the reaction vessels or postnormalized after the fact. Accounting for specific surface area within reaction vessels is needed to maintain comparable ratios of sorbate to sorbent surface sites. When normalized for BET specific surface area (A_(sfBET)) within the reaction vessels, the Pb(II) sorption edge shifted ~0.5 pH units to the left for <10 nm hematite particles, but maximum sorption density (at pH ≥ 6) was unaffected by particle size. DFOB had little or no effect on Pb(II) sorption to <10 nm particles, but DFOB decreased Pb(II) sorption to the 40 nm particles at pH ≥ 6 by~20%. Hematite (nano)particle size thus exerts subtle effects on Pb(II) sorption, but the effects may be more pronounced in the presence of a metal complexing agent.
机译：这项研究的重点是吸附边缘实验（例如，以吸附的形式吸附）对粒径（40、8.6和3.6运行）和微生物配体去铁胺B（DFOB）对Pb（II）吸附至赤铁矿的影响。 pH的函数）。当将赤铁矿纳米粒子尺寸对吸附边缘的影响（以吸附密度或Pb吸收百分比绘制）时，取决于是否对实验进行归一化以考虑反应容器中比表面积的差异还是事后进行归一化。需要考虑反应容器内的比表面积，以保持山梨酸酯与吸附剂表面部位的可比比例。当对反应容器中的BET比表面积（A_（sfBET））进行标准化时，对于<10 nm赤铁矿颗粒，Pb（II）的吸附边缘向左偏移〜0.5 pH单位，但最大吸附密度（在pH≥6时）不受粒度的影响。 DFOB对<10 nm颗粒的Pb（II）吸附几乎没有影响，但在pH≥6时，DFOB降低了对40 nm颗粒的Pb（II）吸附〜20％。因此，赤铁矿（纳米）的粒径对Pb（II）的吸附有微妙的影响，但在存在金属络合剂的情况下，这种影响可能会更加明显。

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  • 来源
    《Environmental Science & Technology》 |2011年第8期|p.3231-3237|共7页
  • 作者

    Lauren E. Barton; Katherine E. Grant; Thomas Kosel; Andrew N. Quicksall; Patricia A. Maurice;

  • 作者单位

    Department of Civil Engineering & Geological Sciences and Department of Electrical Engineering, University of Notre Dame,Notre Dame, Indiana 46556, United States Department of Civil Engineering & Geological Sciences;

    Department of Civil Engineering & Geological Sciences and Department of Electrical Engineering, University of Notre Dame,Notre Dame, Indiana 46556, United States Department of Civil Engineering & Geological Sciences;

    Department of Electrical Engineering;

    Department of Civil Engineering & Geological Sciences and Department of Electrical Engineering, University of Notre Dame,Notre Dame, Indiana 46556, United States Department of Civil Engineering & Geological Sciences;

    Department of Civil Engineering & Geological Sciences and Department of Electrical Engineering, University of Notre Dame,Notre Dame, Indiana 46556, United States Department of Civil Engineering & Geological Sciences;

  • 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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