在Cu3(BTC)2上增强气体吸附金属有机框架,通过合成后的酸交换和计算分析进行计算分析
José M Veleta1, Roy A Arrieta1, Yanyu Wu1
1Department of Chemistry and Biochemistry, University of Texas at El Paso, El Paso, Texas 79968, United States.
Langmuir : the ACS journal of surfaces and colloids
|June 2, 2023
概括
金属有机框架 (MOF) 的合成后修改增强了气体吸附. 在HKUST-1类型的MOF中,特别是Cu3(BTC) 2中,通过创建结构缺陷,改善了CO2吸收.
科学领域:
- 材料科学 材料科学 材料科学
- 化学 化学 化学
- 纳米技术 纳米技术
背景情况:
- 金属有机框架 (MOF) 是具有可调节性质的多孔材料.
- HKUST-1 (Cu3(BTC) 2) 是一个众所周知的MOF,在气体储存中具有应用.
- 合成后修改提供了一条进一步提高MOF性能的途径.
研究的目的:
- 调查阴离子交换对HKUST-1.1气体吸附性质的影响.
- 通过合成后的修改来探索MOF属性的可调性.
- 确定离子交换的最佳条件,以最大限度地增加气体吸附.
主要方法:
- 通过与TM2+ (Mn,Fe,Co,Ni) 溶液进行阴离子交换,对Cu3(BTC) 2进行合成后的修饰.
- 使用粉末X射线衍射,FTIR,ICP-OES和SEM进行表征.
- 气体吸附测量 (CO2) 和表面积分析.
主要成果:
- 实现了Cu节点的部分替换,保留了MOF晶体结构.
- 铁和显示显著的转移 (高达39%和18%),而Mn和Ni显示低的交换 (2.40%和2.02%).
- (Cu/Mn) 3 (BTC) 2表现出最高的二氧化碳吸附能力 (5.47 mmol/g),比原始Cu3 (BTC) 2 (3.08 mmol/g) 显著增加.
- 增加的气体吸附与在阴离子交换期间引入的结构缺陷相关.
结论:
- 合成后的阴离子交换是调整MOF属性的有效策略.
- 缺陷的形成在提高气体吸附能力方面起着至关重要的作用.
- 这种方法为优化现有MOF架构的特定应用提供了一种通用方法.
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