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首页> 外文期刊>Environmental Science & Technology >X-ray Absorption Near Edge Structure Study Of Lead Sorption On Phosphate-treated Kaolinite
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X-ray Absorption Near Edge Structure Study Of Lead Sorption On Phosphate-treated Kaolinite

机译：磷酸盐处理高岭石对铅的X射线吸收近缘结构研究

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摘要

Presorted phosphate significantly increases Pb sorption on the phyllosiiicate kaolinite in the pH range from 4 to 8. The sorbed Pb-to-P molar ratios over this pH range stray little from the molar ratio found in the mineral pyromorphite, suggesting sorbed phosphate reacts with soluble Pb to form a surface precipitate similar to pyromorphite. X-ray absorption near edge structure (XANES) studies at the Pb L_3-edge support this interpretation. In particular, the fine structure of first-derivative Pb L_3-edge XANES spectra of Pb species sorbed to phosphate-treated kaolinite samples covering a pH range extending from 4 to 10 match the fine structure of the spectrum of pyromorphite. Although the product is structurally and compositionallysimilarto pyromorphite, the ion activity product in the pH range 4-6 was undersaturated with respect to the solubility product of pyromorphite.
机译：在pH范围为4至8时，预分选的磷酸盐显着增加了叶绿素高岭石上Pb的吸附。在该pH范围内，吸附的Pb-P摩尔比与矿物次黄铁矿中的摩尔比几乎没有偏差，表明吸附的磷酸盐与可溶性铅形成类似于焦晶石的表面沉淀。 Pb L_3边缘的X射线近边缘结构吸收（XANES）研究支持这种解释。特别是，吸附到磷酸盐处理的高岭石样品上的Pb物种的一阶Pb L_3-edge XANES光谱的精细结构覆盖了从4到10的pH范围，与亚铁矿的光谱的精细结构匹配。尽管产物在结构和组成上与焦晶石相似，但相对于焦晶石的溶解度产物，pH范围为4-6的离子活性产物不饱和。

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  • 来源
    《Environmental Science & Technology》 |2009年第3期|711-717|共7页
  • 作者

    ROBERT W. TAYLOR; WILLIAM F. BLEAM; THILINI D. RANATUNGA; CRISTIAN P. SCHULTHESS; ZACHARY N. SENWO; AND DON RUFUS A. RANATUNGA;

  • 作者单位

    Department of Natural Resources and Environmental Sciences, P.O. Box 1208, Alabama ASM. University, Normal, Alabama 35762;

    Department of Soil Science, University of Wisconsin-Madison, 1525 Observatory Drive, Madison, Wisconsin 53706;

    Department of Plant Science, University of Connecticut, 1376 Storrs Road, U-4067, Storrs, Connecticut 06269;

    and Department of Chemistry, Oakwood University, 7000 Adventist Boulevard, Huntsville, Alabama 35896;

  • 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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