X-Ray Absorption Fine Structure (XAFS) Study of the Effects of pH on Pb(Ⅱ) Sorption by Soil
HU Ning-jing1, 2, HUANG Peng3, LUO Yong-ming2*, HU Tian-dou4, XIE Ya-ning4, WU Zi-yu4
1. First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China 2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China 3. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266072, China 4. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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.
胡宁静1, 2, 黄 朋3, 骆永明2*, 胡天斗4, 谢亚宁4，吴自玉4 . XAFS研究不同pH下土壤对Pb的吸附 [J]. 光谱学与光谱分析, 2010, 30(12): 3425-3429.
HU Ning-jing1, 2, HUANG Peng3, LUO Yong-ming2*, HU Tian-dou4, XIE Ya-ning4, WU Zi-yu4 . X-Ray Absorption Fine Structure (XAFS) Study of the Effects of pH on Pb(Ⅱ) Sorption by Soil . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(12): 3425-3429.
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