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功能化Li/NH₂/MIL-101(Cr) 和Li/NH₂/MIL-100(Fe) 用于吸附和从水溶液中分离

Yanjia Zhou¹, Xiaodong Tang¹, Jingjing Li¹

¹Southwest Petroleum University, Department of Chemistry and Chemical Engineering, Chengdu, 610500, Sichuan, China. txda429@163.com.

Dalton transactions (Cambridge, England : 2003)

|August 1, 2025

概括

功能化的金属有机框架 (MOF) 显示了增强的离子 (Li+) 吸附,以实现高效的回收. 这些材料在复杂的解决方案中具有很高的选择性和可重复使用性,这对于可持续的提取至关重要.

科学领域:

材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.
环境科学环境科学

背景情况:

金属有机框架 (MOF),特别是MIL-101 (Cr) 和MIL-100 (Fe),以其高表面积和可调节性质而闻名.
这些特性使它们成为选择性离子吸附的有希望的候选者,特别是从水溶液中回收 (Li+).
现有的MOF可能需要修改,以提高它们的吸附能力和对Li+的选择性.

研究的目的:

合成功能化的MIL型MOFs,Li/NH2/MIL-101 (Cr) 和Li/NH2/MIL-100 (Fe),以改善Li+的提取.
为了研究这些改性MOFs对Li+的吸附性能,动力学,热力学和选择性.
评估功能化MOF在回收过程中的可重复使用性和实际应用性.

主要方法:

使用LiNO3作为模板和矿化剂,合成MIL-101 (Cr) 和MIL-100 (Fe) 与引入的-NH2功能组.
吸附实验以确定不同条件下的Li+吸附能力 (矿化剂剂量,初始Li+度,吸附剂剂量,pH值,温度).
动力学 (伪第一阶,伪第二阶) 和热力学 (朗慕尔,弗洛因德利希) 建模,以了解吸附机制.
在Mg-Li混合溶液和多离子系统中进行选择性测试,以评估分离能力.

主要成果:

功能化MOFs,Li/NH2/MIL-101(Cr) 和Li/NH2/MIL-100(Fe),呈现出分别为43.58和38.22毫克g-1的增强Li+吸附能力.
吸附是单层化学吸附之后的,是外热的,最好用伪二阶动力学和兰木尔/弗朗德利希模型来描述.
材料表现出优异的Li+选择性超过Mg2+ (低Mg2+/Li+比率的分离因子α>80,高比率的~50) 和其他离子 (Li+ ≫ Mg2+ > Ca2+ > Na+ > K+).
观察到可重复使用性很高,在四个循环后保持超过85%的容量.

结论:

合成的Li/NH2/MIL-101 (Cr) 和Li/NH2/MIL-100 (Fe) 是有效的吸附剂,用于+的回收.
功能化策略显著提高了吸附能力和选择性,证明了提取的实际潜力.
基于化学吸收的外热过程和出色的可重复使用性突出显示了这些MOF的可行性,以实现可持续的回收.

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