通过实验和数值建模,探索pH,离子强度和温度对双硫化物吸附在本托尼特上的影响
Sifat Azad Papry1, Reza Rahimi1, Tarek L Rashwan2
1Department of Civil Engineering, York University, Toronto, ON, Canada.
Journal of contaminant hydrology
|February 15, 2026
概括
了解二硫化物在本托尼特上的吸附对于核废物处理至关重要. 这项研究表明,温度,pH值和离子强度显著影响本托尼特粘土屏障中的二硫化物保留.
科学领域:
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 班托尼特粘土对于加拿大深层地质储藏库 (DGR) 的工程屏障系统 (EBS) 是至关重要的.
- 使用过的燃料容器 (UFC) 的微生物学影响的腐蚀由二硫化物 (HS-) 是一个关键的安全问题.
- 了解HS-吸附在本托尼特上的理解对于减轻铜腐蚀至关重要.
研究的目的:
- 为了研究二硫化物 (HS-) 对本托尼特的吸附动态.
- 为了确定温度,pH值和离子强度对HS-吸收的影响.
- 开发和验证HS-在本托尼特中的热力学吸附模型.
主要方法:
- 实验室批量实验使用本托尼特泥进行.
- 在各种温度 (10-40°C),pH (9-11) 和离子强度 (0.01-1 M NaCl) 中测量了HS吸附.
- 一个热力学吸附模型被开发和校准使用PHREEQC.
主要成果:
- HS-吸附随温度增加,但随着pH值和离子强度的增加而减少.
- 一个三向ANOVA证实了测试变量的个体和相互作用效应的统计学意义.
- 热力学模型成功地描述了实验趋势,强调了氧化还原反应,FeS沉和表面复杂化作为关键的吸附机制.
结论:
- 这项研究提供了新的实验和建模洞察力,了解HS-吸收到托尼特上.
- 这些发现有助于更好地了解土矿在缓解DGR中的二硫化物运输中的作用.
- 结果与加拿大DGR和其他全球核废物存储库设计相关.
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