Sorption Efficacy of Weathered Basalt Rock for Metal Ions of Nuclear Importance

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-03-11 DOI:10.2174/0115734110295747240305061230

Harshala Parab, Rahul Sirvi, Shrutika Kadam, Pranesh Sengupta, Sangita D. Kumar, Uttam K. Bhui

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Abstract

Background:: A safe and long-term isolation of radionuclides is crucial for efficient waste management in the nuclear fuel cycle. Clay minerals of geological origin are considered candidate barrier materials for the sequestration of nuclear waste for geological disposal applications. Objective:: The present study encompasses a systematic characterization of weathered basalt rock and the influence of its constituent clay minerals (formed mainly due to the weathering process) in the uptake of metal ions of nuclear importance, such as cesium (Cs+) and strontium (Sr2+). Method:: The structural profile of the weathered basalt has been investigated using different analytical techniques, including polarizing microscope, XRD, FTIR and EDXRF. The sorption behaviour of the rock sample for Cs+ and Sr2+ has been investigated in a comprehensive batch mode by varying the experimental conditions. The analytical findings for structure and batch sorption performance of the material have been further correlated to understand the influence of different parameters on the uptake of metal ions and the underlying mechanism. Results:: Structural analyses confirmed the presence of clay minerals viz., kaolinite, illite and montmorillonite in the sample. A comprehensive sorption performance assessment carried out in batch mode at different experimental conditions revealed that the uptake of both the metal ions was rapid and dependent on initial metal ion concentration and solution pH. The uptake of Cs+ ions was found to be higher as compared to the Sr2+ ions. EDXRF analysis confirmed the loading of Cs+ and Sr2+ on the weathered basalt. Experimental batch sorption data presented a better agreement with the theoretical Freundlich isotherm pertaining to the heterogeneous nature of the sorbent. Conclusion:: The studies highlight that the clay minerals formed by structural alteration of basalt rock upon intense weathering could be very useful in fixing the nuclear fission waste components such as Cs+ and Sr2+.

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风化玄武岩对核金属离子的吸附效能

背景安全、长期地隔离放射性核素对于核燃料循环中有效的废物管理至关重要。地质来源的粘土矿物被认为是封存核废料以进行地质处置的候选屏障材料。研究目的本研究包括风化玄武岩的系统特征及其组成粘土矿物（主要由风化过程形成）对吸收铯（Cs+）和锶（Sr2+）等核重要金属离子的影响。方法：利用不同的分析技术，包括偏光显微镜、XRD、傅立叶变换红外光谱和电离辐射吸收光谱，对风化玄武岩的结构剖面进行了研究。通过改变实验条件，以综合批次模式研究了岩石样本对 Cs+ 和 Sr2+ 的吸附行为。对材料结构和批量吸附性能的分析结果进行了进一步的关联分析，以了解不同参数对金属离子吸收的影响及其内在机制。结果结构分析证实样品中存在粘土矿物，即高岭石、伊利石和蒙脱石。在不同实验条件下以批处理模式进行的全面吸附性能评估表明，两种金属离子的吸附都很迅速，且取决于初始金属离子浓度和溶液 pH 值。与 Sr2+ 离子相比，Cs+ 离子的吸收率更高。电离辐射X射线荧光分析证实了风化玄武岩上的 Cs+ 和 Sr2+ 负荷。实验批次吸附数据与理论上的 Freundlich 等温线更为吻合，这与吸附剂的异质性有关。结论研究结果表明，玄武岩在强烈风化过程中发生结构改变而形成的粘土矿物对固定 Cs+ 和 Sr2+ 等核裂变废物成分非常有用。

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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.