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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Factors Affecting Solubility04:01

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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:
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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

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The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
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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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
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Capturing Acidic CO2 Using Surface-Active Difunctional Core-Shell Composite Polymer Particles via an Aqueous Medium.

M Asheq Mahamud1, A S M Maruf Galib1, Md Muhyminul Islam1

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ACS Omega
|December 4, 2023
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Summary

New amine-functionalized composite polymer particles show enhanced carbon dioxide (CO2) adsorption. These dual-functionalized particles achieved a CO2 uptake of 209 mg/g, nearly double that of reference materials, demonstrating their potential for gas capture applications.

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Environmental Science

Background:

  • Multifunctional surface-active polymeric composites are essential for adsorbing small molecules.
  • Developing efficient adsorbents for carbon dioxide (CO2) is critical for environmental remediation and industrial processes.

Purpose of the Study:

  • To synthesize dual-functionalized, micron-sized, surface-active composite polymer particles for enhanced CO2 adsorption.
  • To investigate the structural, surface, and pH-dependent properties of the synthesized composite particles.

Main Methods:

  • A three-step synthesis involving dispersion polymerization, seeded copolymerization, and Hofmann degradation.
  • Characterization using FTIR, SEM, EDX, BET, BJH, DLS, and ζ-potential measurements.
  • Evaluation of CO2 adsorption capacity by bubbling CO2 through an aqueous medium.

Main Results:

  • Amine-functionalized composite particles were successfully synthesized with primary amine groups on the surface.
  • Characterization confirmed particle morphology, surface composition, porosity, and pH-dependent surface properties.
  • The aminated composite particles exhibited a CO2 adsorption capacity of 209 mg/g, significantly higher than reference particles.

Conclusions:

  • The synthesized aminated composite polymer particles are effective adsorbents for CO2.
  • The dual-functionalization strategy enhances CO2 adsorption performance.
  • These materials hold promise for applications in carbon capture technologies.