EXAFS study of the local environment of lead and iron sorbed onto volcanic ash

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2023-08-01 DOI:10.1016/j.elspec.2023.147379

Bridinette Thiodjio Sendja , Duclair Tchana Kamgne , Rene Loredo Portales , Giuliana Aquilanti

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Abstract

This work focuses on the EXAFS investigation of the local environment of lead and iron sorbed onto volcanic ash materials previously studied using XANES technique. Different compounds found in the composition of volcanic ash were used as the models in the EXAFS fitting procedure of the experimental EXAFS spectra collected at the Fe K edge and Pb L3 edge in the Fe- and Pb-sorbed volcanic ash samples. The results showed two types of interactions involving in the adsorption process of both samples. The first is related to iron or lead absorber with oxygen atoms in the first coordination shell. The second interaction occurred between the absorbers (Fe or Pb) and the backscatters (Fe or Pb) in the second shell. The local environment of the iron-sorbed element may have a cubic geometry with different crystallographic sites related to oxygen and iron atoms. On the other hand, the lead-sorbed element may be in orthorhombic geometry with different sites related to oxygen atoms and lead atoms. The adsorption mechanisms involved in the process of iron and lead sorption are ion exchange with probable chemisorption for iron and microprecipitation for lead.

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火山灰吸附铅和铁的局部环境EXAFS研究

这项工作的重点是利用EXAFS对先前使用XANES技术研究的火山灰材料吸附铅和铁的局部环境进行调查。在EXAFS拟合过程中，采用火山灰成分中发现的不同化合物作为模型，对吸附铁和铅的火山灰样品中Fe K边缘和Pb L3边缘采集的EXAFS实验光谱进行拟合。结果表明，两种样品的吸附过程中存在两种类型的相互作用。第一种是在第一配位壳层中具有氧原子的铁或铅吸收体。第二次相互作用发生在吸收体(Fe或Pb)和后向散射体(Fe或Pb)之间。铁吸附元素的局部环境可能具有立方几何形状，具有与氧原子和铁原子相关的不同晶体学位点。另一方面，铅吸附元素可能呈正交几何，与氧原子和铅原子相关的位置不同。铁和铅的吸附机制主要是离子交换和可能的化学吸附和铅的微沉淀。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.