Speciation and oxidation reaction analysis of selenium in aqueous solution using X-ray absorption spectroscopy for management of trace element in FGD liquor

被引：12

作者：

Akiho, Hiroyuki ^{[1
]}

Yamamoto, Tohru ^{[1
]}

Tochihara, Yoshihisa ^{[1
]}

Noda, Naoki ^{[1
]}

Noguchi, Shinichi ^{[2
]}

Ito, Shigeo ^{[1
]}

机构：

[1] Cent Res Inst Elect Power Ind, Energy Engn Res Lab, Yokosuka, Kanagawa 2400196, Japan

[2] Elect Power Engn Syst DTS, Yokosuka Off, Yokosuka, Kanagawa 2400101, Japan

来源：

FUEL | 2012年 / 102卷

关键词：

XAFS; XANES; EXAFS; Selenium; Wet FGD; CRYSTAL-STRUCTURE; COAL; ASH; SELENATE;

D O I：

10.1016/j.fuel.2012.06.076

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Batch and in situ X-ray absorption spectroscopy (XAS) analysis were applied to the identification of selenium in aqueous solution containing selenite (Sed(IV)O-3(2-)) and selenate (Sed(VI)O-4(2-)) ranging from 10 to 1000 mg-Se/L, respectively. Se K-edge XANES spectra were detected by means of a multi-channel silicon drift detector (SDD). Furthermore, the oxidation state of selenium was identified by measuring the energy of X-ray absorption, and the local structure around selenium atom was determined by analyzing the EXAFS. The Se K-edge XANES spectrum of selenite was gradually shifted to that of selenate in the presence of peroxodisulfate ion (S2O82-) which was the dominant oxidizing agent in wet flue gas desulfurization (FGD) liquor and had a subsequent effect on the selenium oxidation in the liquid phase. Concentrations of selenite and selenate calculated by linear fitting analysis of the XANES spectra were in good agreement with the results of quantitative analysis for selenite and selenate by ICP-AES. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：156 / 161

页数：6

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