Organometallic functionalized clays for technetium immobilization

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2024-10-09 DOI:10.1016/j.clay.2024.107588

Emily Maulden , Elizabeth Gager , An T. Ta , Rachel F. Wood , Daria Boglaienko , Juan C. Nino , Carolyn I. Pearce , Simon R. Phillpot , James E. Szecsody , Nathalie A. Wall

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Abstract

Nuclear waste repository designs require backfill materials to contain long-lived radionuclides, including technetium-99, present as the pertechnetate anion (TcO₄⁻) under oxic repository conditions and mobile in the environment. Bentonite has been proposed as a suitable backfill material, and it is composed of montmorillonite clay, which can be functionalized to optimize its performance for TcO₄⁻ sorption. In the current work, bentonite clay is functionalized with organic and inorganic moieties, and the impact of dual functionalization on TcO₄⁻ sorption is investigated. The results show that the ordering of the functionalization is essential and that adding metal to an organoclay improves TcO₄⁻ sorption compared to either the reverse ordering or the organic/inorganic clay alone. Furthermore, the TcO₄⁻ sorption to the organometallic clays was consistent with either chemisorption or cooperative sorption, with a multi-step mechanism determining the kinetics of sorption.

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用于固定锝的有机金属功能化粘土

核废料贮存库设计要求回填材料能够容纳长效放射性核素，包括锝-99，锝-99 在氧化贮存库条件下以过锝酸阴离子（TcO4-）的形式存在，并可在环境中移动。膨润土被认为是一种合适的回填材料，它由蒙脱石粘土组成，可以通过功能化来优化其对 TcO4- 的吸附性能。在当前的研究中，膨润土被有机和无机分子功能化，并研究了双重功能化对 TcO4- 吸附的影响。结果表明，官能化的排序至关重要，与反向排序或单独的有机/无机粘土相比，在有机粘土中添加金属可改善对 TcO4- 的吸附。此外，有机金属粘土对 TcO4- 的吸附与化学吸附或协同吸附一致，吸附动力学由多步骤机制决定。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...