Understanding of Cs(I) and Am(III) retention behaviour on Vindhyan argillaceous clay for evaluating its suitability for nuclear waste management

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Earth Sciences Pub Date : 2025-05-15 DOI:10.1007/s12665-025-12269-2

Aishwarya Soumitra Kar, Priyanka Balan, M. K. Das, S. Jeyakumar, R. K. Bajpai, M. K. Saxena

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引用次数: 0

Abstract

The global investigation of geological barriers is advancing for their use in nuclear waste management. Argillaceous clay-based repositories appear to be a suitable and viable option for the management of high-level nuclear waste (HLW). The retention behaviour of Cs(I) and Am(III) on Vindhyan argillaceous clay has been examined from this perspective. The characterization of Vindhyan argillaceous clay indicated that it mostly comprises illite (25%) and quartz (75%), with a cation exchange capacity (CEC) of 210 meq kg⁻¹, which is notably higher compared to other clays. The investigation of the influence of time, pH, ionic strength, radionuclide concentration, and temperature on the sorption of Cs(I) and Am(III) by Vindhyan argillaceous clay indicated that Cs(I) sorption occurs through ion exchange, whereas Am(III) sorption become apparent through both ion exchange and surface complexation. Thermodynamic parameters for the sorption reactions were derived from equilibrium constants determined by modelling the profiles of Cs(I) and Am(III). The sorption of Cs(I) was enthalpy-driven, whereas the sorption of Am(III) was entropy-driven.

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了解Cs(I)和Am（III）在Vindhyan泥质粘土上的保留行为以评价其对核废料管理的适用性

地质屏障在核废料管理中的应用的全球调查正在推进。泥质粘土资源库似乎是高放核废料管理的一种合适和可行的选择。从这个角度研究了Cs(I)和Am（III）在Vindhyan泥质粘土上的滞留行为。Vindhyan泥质粘土的特征表明，其主要成分为伊利石（25%）和石英（75%），阳离子交换容量（CEC）为210 meq kg−1，明显高于其他粘土。研究了时间、pH、离子强度、放射性核素浓度和温度对Vindhyan泥质粘土吸附Cs(I)和Am（III）的影响，表明Cs(I)的吸附是通过离子交换进行的，而Am（III）的吸附是通过离子交换和表面络合进行的。吸附反应的热力学参数由模拟Cs(I)和Am（III）的平衡常数推导而来。Cs(I)的吸收是焓驱动的，而Am（III）的吸收是熵驱动的。

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来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.