素酸配体的吸附,以改善从莫纳矿石中提取稀土元素
Muchu Zhou1, Luke D Gibson2, Diana Stamberga1
1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
Journal of colloid and interface science
|September 13, 2025
概括
新型胺酸连接物对稀土元素 (REE) 分离有希望. 乙酸 (OHA) 具有高吸附性,但4-乙氧-N,2-二基胺 (EDHBA) 提供更稳定的表面相互作用,以改善泡漂浮.
科学领域:
- 矿物加工和表面化学
- 开发用于稀土元素 (REE) 分离的新型配体.
背景情况:
- 在各种高科技应用中,高效的REE分离至关重要.
- 泡漂浮需要具有高吸附能力和对REE矿石的选择性的配体.
- 了解连接物-矿物表面相互作用是设计有效分离剂的关键.
研究的目的:
- 系统地评估基和芳香基替代胺酸连接体在莫纳表面的吸附行为.
- 阐明影响分离性能的吸附机制.
- 为了指导新的联结体的设计,以加强REE分离.
主要方法:
- 使用紫外可见 (UV-vis),拉曼,红外和振动总频率生成 (SFG) 谱学.
- 进行了ab initio分子动力学 (AIMD) 模拟,以研究连接体-表面相互作用.
- 在基本pH条件下 (8-10) 在莫纳表面上研究吸附.
主要成果:
- 乙酸 (OHA) 和4-乙氧-N,2-二基胺 (EDHBA) 形成了具有高吸附能力的多层.
- 与EDHBA相比,OHA表现出更高的平衡吸附,但形成不太稳定的多层.
- AIMD揭示了OHA (单化) 和EDHBA (多重相互作用) 的独特结合模式,影响了吸附动力学.
结论:
- 配体结构显著影响矿物表面的吸附动力学,容量和稳定性.
- 表面结合和分子间相互作用的差异影响漂浮性能.
- 这项研究为设计高效的REE分离的先进配体提供了关键的见解.
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