• Spectroscopy and Spectral Analysis
  • Vol. 30, Issue 12, 3425 (2010)
HU Ning-jing1、2、*, HUANG Peng3, LUO Yong-ming2, HU Tian-dou4, XIE Ya-ning4, and WU Zi-yu4
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
  • 3[in Chinese]
  • 4[in Chinese]
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    DOI: Cite this Article
    HU Ning-jing, HUANG Peng, LUO Yong-ming, HU Tian-dou, XIE Ya-ning, WU Zi-yu. X-Ray Absorption Fine Structure (XAFS) Study of the Effects of pH on Pb(Ⅱ) Sorption by Soil[J]. Spectroscopy and Spectral Analysis, 2010, 30(12): 3425 Copy Citation Text show less

    Abstract

    Combined batch sorption and in situ X-ray absorption fine structure (XAFS) provide direct assessment of the mechanisms for Pb(Ⅱ) sorption at the soil-water interface under different pH conditions. The XAFS data indicated that the inner-sphere Pb sorption complex with ionic character (Pb4(OH)4+4) dominated the Pb surface speciation, and the outer-sphere Pb sorption complex and the precipitation of calcium carbonate containing Pb(PbCaCO3) were also involved in the adsorption samples. Coordination number and radial distance of the first-shell Pb—O decreased from 0.172 7 to 0.166 6 nm and the percentage of inner-sphere complexes increased when the initial pH changed from 6.0 to 8.5, indicating that the mechanism of Pb(Ⅱ) sorption by the soil was pH-dependent.
    HU Ning-jing, HUANG Peng, LUO Yong-ming, HU Tian-dou, XIE Ya-ning, WU Zi-yu. X-Ray Absorption Fine Structure (XAFS) Study of the Effects of pH on Pb(Ⅱ) Sorption by Soil[J]. Spectroscopy and Spectral Analysis, 2010, 30(12): 3425
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