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Related Concept Videos

Dialysis01:15

Dialysis

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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Detergent Purification of Membrane Proteins01:18

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Entropy and Solvation02:05

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Ion Exchange

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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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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and...
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Hydrogen Separation Membranes: A Material Perspective.

Dixit V Bhalani1, Bogyu Lim1

  • 1Department of Engineering Chemistry, Chungbuk National University (CBNU), Cheongju 28644, Chungbuk, Republic of Korea.

Molecules (Basel, Switzerland)
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The global shift to renewable energy necessitates advanced hydrogen purification. This review highlights membrane technologies as a sustainable alternative to conventional methods for efficient hydrogen separation and a greener energy future.

Keywords:
hydrogen purificationmembrane materialsmixed-matrix membranespolymer membranessustainable energy

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Technology

Background:

  • Global environmental concerns drive a transition towards low-carbon hydrogen energy.
  • Conventional hydrogen production methods like steam methane reforming are carbon-intensive and require purification.
  • There is a critical need for sustainable and efficient hydrogen generation and purification technologies.

Purpose of the Study:

  • To review the evolution of hydrogen purification technologies from conventional methods to advanced membrane-based systems.
  • To analyze various membrane materials, including metal, inorganic, polymeric, and mixed-matrix membranes, for hydrogen separation.
  • To provide a comprehensive material perspective on hydrogen separation membranes for practical applications.

Main Methods:

  • Exploration of conventional separation techniques such as pressure swing adsorption and cryogenic distillation.
  • Detailed discussion of advanced membrane-based gas-separation technologies.
  • Analysis of diverse membrane materials (metal, inorganic, polymeric, mixed-matrix) and their performance metrics (selectivity, permeability, durability).

Main Results:

  • Membrane-based technologies offer higher efficiency and selectivity for hydrogen purification compared to conventional methods.
  • Various materials, including dense, alloyed, amorphous metals, zeolites, silica, CMSMs, polymers, and mixed-matrix membranes, show promise for hydrogen separation.
  • Advancements in membrane materials significantly enhance hydrogen selectivity, permeability, and durability for practical applications.

Conclusions:

  • Membrane technology is a key enabler for efficient and sustainable hydrogen purification.
  • Continued development of advanced membrane materials is crucial for realizing the potential of hydrogen energy.
  • This review supports the adoption of hydrogen energy as a sustainable solution for future energy demands.