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Related Concept Videos

Ion Exchange01:17

Ion Exchange

1.2K
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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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
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Polar modified dendritic post-cross-linked polymer for Cu2+ adsorption.

Xiaomi Yuan1, Fa Zhou1, Fang Long1

  • 1College of Chemistry and Chemical Engineering, Central South University, Changsha, People's Republic of China.

Environmental Technology
|September 25, 2019
PubMed
Summary

A novel polymer, HCPD, effectively removes copper ions (Cu2+) from water. Its amino and carbonyl groups enhance adsorption capacity, which increases with temperature, and the material is easily recyclable.

Keywords:
Cu2+Post-cross-linked polymeradsorptiondendrimersmechanism

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Polymer Chemistry

Background:

  • Copper (Cu2+) contamination in aqueous solutions poses environmental and health risks.
  • Effective and sustainable methods for heavy metal removal are crucial for water remediation.

Purpose of the Study:

  • To synthesize and characterize a polar modified dendritic post-cross-linked polymer (HCPD).
  • To investigate the adsorptive removal efficiency of HCPD for Cu2+ from aqueous solutions.
  • To elucidate the adsorption mechanism and recyclability of the synthesized polymer.

Main Methods:

  • Synthesis and characterization of HCPD.
  • Batch adsorption experiments for Cu2+ removal.
  • Adsorption isotherm and kinetic studies (Langmuir, pseudo-second-order, intra-particle diffusion).
  • Regeneration and recycling experiments.
  • Spectroscopic analysis (FT-IR, XPS) to determine adsorption mechanism.

Main Results:

  • HCPD exhibited high loading of amino (5.12 mmol/g) and carbonyl (2.25 mmol/g) groups.
  • Maximum adsorption capacity of 157.8 mg/g at 313 K, increasing with temperature.
  • Adsorption followed Langmuir isotherm and pseudo-second-order kinetics, indicating chemical interaction.
  • HCPD demonstrated excellent recyclability over five cycles without significant capacity loss.
  • FT-IR and XPS confirmed chelating coordination between polymer functional groups and Cu2+.

Conclusions:

  • HCPD is a highly effective adsorbent for Cu2+ removal from aqueous solutions.
  • The polar functional groups (amino and carbonyl) are key to the high adsorption capacity.
  • The material's regenerability and recyclability make it a promising candidate for sustainable water treatment.