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在自然和热处理的粘土材料中的湿度的热重力测量分析
Giulia Lo Dico1,2,3,4, Lorenzo Lisuzzo4, Verónica Carcelén2,3
1IMDEA Materials Institute, C/Eric Kandel 2, Getafe, 28906 Madrid, Spain.
Materials (Basel, Switzerland)
|May 25, 2024
概括
粘土矿物的热处理会影响它们的水分特性和分子吸附. 纤维粘土比状粘土需要更多的能量来释放水分,这会影响亚毒素B1和β-胡卜素的吸附.
科学领域:
- 材料科学 材料科学 材料科学
- 粘土矿物学是指粘土矿物学.
- 表面化学 表面化学
背景情况:
- 粘土是具有自然潮湿表面的多孔材料.
- 水分子影响粘土表面的特性和可访问性.
- 热处理可以修改这些分子相互作用的特性.
研究的目的:
- 使用调制热重力测量分析 (MTGA) 调查五种粘土矿物的水分行为.
- 评估温和热处理 (150°C) 对水分去除的影响.
- 相关热特性与阿弗拉托辛B1 (AFB1) 和β-胡卜素的吸附.
主要方法:
- 模块化热重力测量分析 (MTGA) 对于湿度行为.
- 清除水的激活能量 (Ea) 的计算.
- MTGA结果与物理化学性质和分子吸附的统计相关性.
主要成果:
- 清除水的激活能量在纤维 (160-190 kJ mol-1) 和叶片粘土 (80-100 kJ mol-1) 之间有所不同.
- 热处理改变了Na-montmorillonite,stevensite和sepiolite的补水能量,但在 palygorskite中增加了它.
- 吸附率有所不同:AFB1的12-97%,β-胡卜素的22-35%,与Ea相关.
结论:
- 热处理对粘土的水分动态和吸附能力产生重大影响.
- 清除水的激活能量是AFB1吸附的关键预测因素.
- 粘土结构在吸附中起着至关重要的作用,特别是在积极的水分去除后.
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