低分子量有机酸在西利曼石上的溶解机制
Chenyang Zhang1, Yaling Yu1, Mingfeng Zhong2
1School of Materials Science and Engineering, Hanshan Normal University, Chaozhou 521041, China.
Materials (Basel, Switzerland)
|October 28, 2023
概括
这项研究调查了低分子量有机酸 (LMWOAs) 如何影响西利曼石溶解. 有机酸加速Si和Al的释放,溶解通过表面反应控制,特定的矿物平面被不同的酸所准.
科学领域:
- 矿物学和地质化学
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 低分子量有机酸 (LMWOAs) 与矿物质的相互作用得到了充分的研究,但在有机酸中西利曼酸的溶解机制仍未得到充分探索.
- 了解这些相互作用对于矿物加工和环境应用至关重要.
研究的目的:
- 在不同LMWOAs (酸,酸和混合物) 的存在下研究西利曼酸的溶解机制.
- 在不同的有机酸条件下确定西利曼酸溶解的动力学和控制因素.
- 探索使用LMWOAs对西利曼的环保激活的潜力.
主要方法:
- 用酸,酸和在控制pH的复合溶液进行了西利曼酸溶解实验.
- 随着时间的推移,对 (Si) 和 (Al) 的溶解率进行了监测.
- 使用X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 进行了处理过的西利曼的表面表征.
主要成果:
- LMWOAs显著增加了来自岩的Si和Al的初始溶解速率,随着时间的推移,速度会下降.
- 溶解动力学遵循一个第一阶方程 (Ct = a(1 - exp(-kt))) ,R2 > 0.991,表明表面化学反应控制了这个过程.
- 酸优先溶解Si丰富的平面 ((120)),而酸则准Al丰富的平面 ((210)). 复合酸通过交替攻击Si-O和Al-O键来诱导更深的孔.
结论:
- 石灰岩在LMWOAs中的溶解主要由表面化学反应控制,特定的晶体平面具有差异反应性.
- 酸和酸对西利曼酸溶解具有明显的选择性,对Si和Al的释放产生不同的影响.
- 这些发现提供了关于西里马尼特溶解机制的见解,并表明了对环境友好的矿物激活策略的潜力.
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