Sorption of Se(VI) and Se(IV) on AFm phases

IF 3.1 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Applied Geochemistry Pub Date : 2024-09-14 DOI:10.1016/j.apgeochem.2024.106177

B. Lothenbach , L. Nedyalkova , E. Wieland , U. Mäder , H. Rojo , J. Tits

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引用次数: 0

Abstract

Selenate and selenite can sorb on AFm phases such as monosulfate, monocarbonate or hemicarbonate. Sorption and co-precipitation experiments were performed to determine their potential for the immobilization of two of the main aqueous species of selenium: Se^VIO₄²⁻ and Se^IVO₃²⁻. A preferential uptake by hemicarbonate over monosulfate, and a much weaker sorption on monocarbonate was observed for both Se(IV) and Se(VI). Increased sulfate and carbonate concentrations as present at higher pH lowered the uptake of Se(VI) and Se(IV).

Experimentally obtained sorption isotherms on hemicarbonate and monosulfate were reproduced with thermodynamic solid solution models, considering both surface sorption and interlayer bonding. For monocarbonate interlayer sorption was suppressed by the rigid structure and narrow interlayer distance. The observed limited uptake could be described by an anion exchange model on the outer surfaces only. This study shows that both anion exchange in the interlayer as well as sorption on outer surface sites can determine Se uptake by AFm phases.

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AFm 相对 Se(VI) 和 Se(IV) 的吸附作用

硒酸盐和亚硒酸盐可吸附在单硫酸盐、单碳酸盐或半碳酸盐等 AFm 相上。我们进行了吸附和共沉淀实验，以确定它们固定两种主要水生硒的潜力：SeVIO42- 和 SeIVO32-。结果表明，硒（IV）和硒（VI）对半碳酸盐的吸附优于对单硫酸盐的吸附，而对单碳酸盐的吸附要弱得多。考虑到表面吸附和层间结合，用热力学固溶体模型再现了实验获得的半碳酸盐和单硫酸盐吸附等温线。对于单碳酸盐，刚性结构和狭窄的层间距离抑制了层间吸附。观察到的有限吸收只能通过外表面的阴离子交换模型来描述。这项研究表明，层间的阴离子交换和外表面位点的吸附都能决定 AFm 相对 Se 的吸收。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.