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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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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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The stability and compatibility of column material with samples are crucial for efficient purification in chromatographic techniques. Various operating parameters such as pH, temperature, or solvent affect the packing of the column material, thereby determining the purification efficiency. The choice of column material also plays an essential role in deciding the operating parameters and can be modified based on the proteins that need to be purified.
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Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
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Biomass chitosan-derivative-based hypercrosslinked polymers as high-efficiency iodine adsorbents.

Chang Dong1, Zhichun Shi1, Jianjun Wang2

  • 1Technology Innovation Center of Industrial Hemp, State Administration for Market Regulation, College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, Heilongjiang, 161006, China.

International Journal of Biological Macromolecules
|April 3, 2026
PubMed
Summary

New chitosan-based hypercrosslinked polymers (MCHCPs) effectively capture radioactive iodine from nuclear waste. These materials offer high adsorption capacity and excellent recyclability for environmental remediation.

Keywords:
ChitosanHypercrosslinked polymersIodine adsorptionIodine breakthrough experiment

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nuclear Engineering

Background:

  • Nuclear energy is a growing source of clean energy, but spent fuel generates hazardous radioactive iodine.
  • Radioactive iodine poses significant risks due to its volatility and diffusion.
  • Effective methods are needed to manage and remove radioactive iodine from nuclear waste.

Purpose of the Study:

  • To synthesize novel chitosan-based hypercrosslinked polymers (MCHCPs).
  • To evaluate the adsorption performance of MCHCPs for radioactive iodine vapor and aqueous solutions.
  • To investigate the adsorption mechanism and recyclability of the developed materials.

Main Methods:

  • Chitosan modification via Schiff base and Friedel-Crafts reactions.
  • Characterization of MCHCPs for thermal stability, surface area, and porous structure.
  • Iodine adsorption experiments under static and dynamic conditions, and in aqueous solutions.
  • Kinetic and isotherm studies to determine adsorption mechanisms.
  • Recyclability tests over multiple adsorption-desorption cycles.

Main Results:

  • MCHCPs exhibited high thermal stability, large surface area, and rich porous structures.
  • MCHCP-1 showed high adsorption capacities for static (8.49 mg/g) and dynamic (2.38 mg/g) iodine vapor.
  • MCHCP-1 achieved 98.7% removal of iodine in aqueous solution within 2.5 min, with a max capacity of 1941 mg/g.
  • Adsorption followed pseudo-second-order kinetics and the Langmuir model, indicating chemisorption.
  • The materials retained over 85% of their iodine vapor uptake capacity after five cycles.

Conclusions:

  • Chitosan-based hypercrosslinked polymers are promising adsorbents for radioactive iodine.
  • The developed materials demonstrate efficient and rapid iodine capture from both vapor and aqueous phases.
  • Excellent recyclability and a chemisorption mechanism highlight the practical application potential for nuclear waste management.