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Related Concept Videos

Ionic Radii03:10

Ionic Radii

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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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High-Performance Liquid Chromatography: Elution Process01:05

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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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Supported ionic liquids as highly efficient and low-cost material for CO2/CH4 separation process.

Bárbara B Polesso1, Franciele L Bernard2, Henrique Z Ferrari2

  • 1Post-Graduation Program in Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul - PUCRS, Brazil.

Heliyon
|August 8, 2019
PubMed
Summary
This summary is machine-generated.

Immobilizing ionic liquids (ILs) in silica supports enhances CO2/CH4 separation from natural gas. Supported ILs show improved selectivity and faster kinetics, offering efficient, low-cost solutions.

Keywords:
CO2 separationImmobilizationIonic liquidsNatural gasPetroleum engineering

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Ionic liquids (ILs) immobilization in solid materials is a promising strategy for CO2 capture.
  • Developing efficient CO2 separation techniques is crucial for natural gas processing and environmental protection.

Purpose of the Study:

  • To evaluate the effect of physically immobilizing two ionic liquids (ILs) with different anions (bmim[Cl] and bmim[OAc]) on mesoporous silica supports (SBA-15 and rice husk-derived silica) for CO2 separation from natural gas.
  • To assess the CO2 sorption capacity, CO2/CH4 selectivity, and sorption kinetics of the immobilized ILs.

Main Methods:

  • Experimental determination of CO2 sorption capacity.
  • Measurement of CO2/CH4 selectivity.
  • Analysis of sorption kinetics for pure supports, pure ILs, and ILs immobilized on supports.

Main Results:

  • Pure silica supports exhibited higher CO2 sorption capacity than immobilized ILs.
  • Immobilization of ILs significantly improved CO2 removal efficiency in CO2/CH4 mixtures.
  • Supports immobilized with bmim[Cl] showed the highest selectivity, with SIL-Cl increasing by 37% and SBA-Cl by 51% compared to their respective supports.
  • Supported ILs demonstrated faster sorption kinetics compared to pure ILs.

Conclusions:

  • Physically immobilized ILs on mesoporous silica supports are effective for CO2/CH4 separation, offering enhanced selectivity and kinetics.
  • The choice of IL anion (Cl- vs. OAc-) and support material influences separation performance.
  • Supported ILs present a viable, cost-effective alternative for efficient CO2 separation processes in natural gas.