Related Experiment Video
Updated: Jun 23, 2026
08:59
A Freeze-Thawing Method to Prepare Chitosan-Poly(vinyl alcohol) Hydrogels Without Crosslinking Agents and Diflunisal Release Studies
Published on: January 14, 2020
Comparative Study between Cryogel and Hydrogel-Based Chitosan: Relationship between Structure, Swelling Ability, and
Pennapa Amonkol1, Chantiga Choochottiros1
1Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.
ACS Omega
|June 22, 2026
Summary
The porous structure of chitosan-based materials significantly impacts heavy metal adsorption. Cryogels with interconnected pores show superior copper removal compared to hydrogels, highlighting structural importance for environmental remediation.
Area of Science:
- Materials Science
- Environmental Science
- Polymer Chemistry
Background:
- Chitosan-based materials are effective heavy metal adsorbents.
- The influence of their internal porous structure on adsorption is not well understood.
Purpose of the Study:
- To compare the adsorption performance of chitosan/star-shaped polycaprolactone (CS/stPCL) cryogels and hydrogels.
- To investigate the role of internal porous structure in heavy metal adsorption.
Main Methods:
- Synthesis of CS/stPCL cryogels and hydrogels using urethane/urea cross-linking.
- Scanning electron microscopy (SEM) to analyze porous structure.
- Swelling tests, Cu-(II) removal efficiency, adsorption kinetics, and isotherm studies.
Main Results:
- Cryogel exhibited a highly interconnected macroporous network; hydrogel had thicker pore walls.
- Cryogel showed higher equilibrium swelling ratio and better Cu-(II) removal efficiency.
- Adsorption followed a physisorption mechanism, with distinct kinetic and isotherm behaviors for each material.
Conclusions:
- The internal porous structure is crucial for designing effective heavy metal adsorbents, comparable in importance to chemical composition.
- CS/stPCL cryogels demonstrate potential as sustainable materials for environmental remediation due to their structure and biodegradability.
