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Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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溶剂诱导的拓变化在Zn-Triazolate-Dicarboxylate柱状层框架的多元组件乙烯净化.

Rong Yang1, Jian-Wei Cao1, Tao Zhang1

  • 1Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Xi'an Key Laboratory of Functional Organic Porous Materials, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.

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溶剂的选择决定了金属有机框架 (MOF) 结构,产生了不同的支柱层拓. 一种MOF,Zn-mfa-atz-pcu,从气体混合物中实现了高纯度乙烯的分离.

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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) 是具有可调节结构的先进多孔材料.
  • 柱状层MOF,特别是金属三酸二碳酸盐,在气体吸附方面表现出潜力.
  • 了解溶剂效应是控制MOF合成和特性的关键.

研究的目的:

  • 为了研究不同溶剂对金属三酸二碳酸盐支柱层框架的合成的影响.
  • 探索通过溶剂模板合成可以实现的结构多样性.
  • 评估合成的MOF的气体分离性能,特别是用于乙烯净化.

主要方法:

  • 使用不同的溶剂混合物 (H2O/EtOH与DMF/H2O/MeOH) 的溶解热合成.
  • 通过X射线衍射来描述由此产生的框架拓 (rob型和pcu型).
  • 气体突破实验,以评估分离效率.

主要成果:

  • 通过改变溶剂系统,合成了两个不同的拓MOF结构,Zn-mfa-atz-rob (rob类型) 和Zn-mfa-atz-pcu (pcu类型).
  • 溶剂充当模板,指导不同框架结构的形成.
  • Zn-mfa-atz-pcu证明了高纯度乙烯 (>99.9%) 在环境温度下从复杂气体混合物中高效单步分离.

结论:

  • 溶剂的选择是控制金属三酸二碳酸盐柱状层MOF的拓学的关键因素.
  • 这种pcu类型的MOF,Zn-mfa-atz-pcu,在选择性乙烯生产中表现出色.
  • 这项工作突显了MOF在先进气体分离应用中的潜力.