X-Ray Absorption Fine Structure (XAFS) Study of the Effects of pH on Pb(II) Sorption by Soil

被引：4

作者：

Hu Ning-jing ^{[1
,2
]}

Huang Peng ^{[3
]}

Luo Yong-ming ^{[1
]}

Hu Tian-dou ^{[4
]}

Xie Ya-ning ^{[4
]}

Wu Zi-yu ^{[4
]}

机构：

[1] Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Peoples R China

[2] State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China

[3] Chinese Acad Sci, Inst Oceanol, Qingdao 266072, Peoples R China

[4] Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Inst High Energy Phys, Beijing 100049, Peoples R China

来源：

SPECTROSCOPY AND SPECTRAL ANALYSIS | 2010年 / 30卷 / 12期

关键词：

Pb; Inner-sphere sorption; Precipitation; Soil; XAFS; WATER INTERFACES; ORGANIC-MATTER; LEAD SORPTION; ADSORPTION; EXAFS; COMPLEXATION; METALS;

D O I：

10.3964/j.issn.1000-0593(2010)12-3425-05

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

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 innersphere Pb sorption complex with ionic character (Pb-4 (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.

引用

页码：3425 / 3429

页数：5

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