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  3. Biomass Chitosan-derivative-based Hypercrosslinked Polymers As High-efficiency Iodine Adsorbents.
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  3. Biomass Chitosan-derivative-based Hypercrosslinked Polymers As High-efficiency Iodine Adsorbents.

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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

View abstract on PubMed

Summary
This summary is machine-generated.

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.