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Videos de Conceptos Relacionados

Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
32.2K
Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
18.8K
Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
25.4K
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

4.8K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Extraction: Advanced Methods00:56

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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...
1.3K
Gravimetry: Inorganic And Organic Precipitating Agents00:49

Gravimetry: Inorganic And Organic Precipitating Agents

5.9K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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Marco de azolato metálico multivariado con pilares de sulfato con flexibilidad ajustable para la captura de CO2 a

Hanze Wang1, Weixiang Zuo1, Zhe Wang1

  • 1School of Physical Science and Technology, Shanghai Key Laboratory of High-Resolution Electron Microscopy, State Key Laboratory of Advanced Medical Materials and Devices, ShanghaiTech University, Shanghai, 201210, China.

Angewandte Chemie (International ed. in English)
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Los investigadores desarrollaron marcos de azolatos metálicos flexibles (MAF) utilizando una estrategia multivariada para una mayor separación de gases. Este enfoque optimiza la captura de CO2 y la purificación de etileno y etano de las mezclas de gases.

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Purificación de los alcanosCaptura de carbonoDesarrollo dinámicoCuadro orgánico de metalBloqueo estructural

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ingeniería Química
  • Nanotecnología

Sus antecedentes:

  • Las estructuras de azolato metálico (MAF) son materiales porosos prometedores para la separación de gases.
  • La flexibilidad del marco de ajuste es crucial para optimizar la absorción y la selectividad del gas.
  • Una estrategia de síntesis multivariada (MTV) ofrece una vía para controlar sistemáticamente las propiedades de MAF.

Objetivo del estudio:

  • Para sintetizar MAFs con pilares de sulfato utilizando una estrategia de MTV para ajustar la flexibilidad del marco y el rendimiento de la separación de gases.
  • Investigar las relaciones estructura-propiedad que rigen la adsorción y la separación de gases en estos MAF.
  • Lograr una mayor separación del CO2 de los hidrocarburos ligeros, en particular la purificación del etileno.

Principales métodos:

  • Síntesis MTV de MAFs con pilares de sulfato con diferentes composiciones de enlaces.
  • Experimentos de adsorción de gases (CO2, C2H4, C2H6) para evaluar la absorción y la selectividad.
  • Experimentos innovadores para evaluar el rendimiento de la separación en el mundo real.
  • Análisis estructurales (por ejemplo, difracción de rayos X) y cálculos de la energía de interacción.

Principales resultados:

  • Un MAF monótono con pilares de sulfato, Zn2 ((daTz) 2SO4, mostró cambios estructurales dinámicos para la absorción eficiente de CO2, C2H4 y C2H6.
  • La incorporación de un enlace asimétrico bloqueó el marco, mejorando la selectividad de CO2 sobre los hidrocarburos.
  • El enfoque MTV permitió un control estructural preciso, lo que condujo a una separación superior de CO2 / C2H6 y CO2 / C2H4.
  • Una composición específica de MAF logró una mejora de 17 veces en la purificación de etileno.

Conclusiones:

  • La estrategia MTV es eficaz para ajustar la flexibilidad del MAF y el rendimiento de la separación de gases.
  • La dinámica estructural y la modificación del enlace son fundamentales para optimizar la captura de CO2 y las separaciones de hidrocarburos.
  • Estos hallazgos proporcionan información para el diseño de materiales porosos avanzados para aplicaciones de separación selectiva de gases.