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Ion Exchange

Ion Exchange

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 basic...

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A Polyelectrolyte Complexation Strategy Enabling Tough and Absorbent Chitosan-Based Xerogels via Simple Atmospheric

Jiangyang Su¹, Sijing Liang¹, Ouyang Zheng¹

¹Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China.

Foods (Basel, Switzerland)

|April 14, 2026

Summary

Chitosan/carboxymethyl cellulose xerogels resist air-drying collapse, offering superior absorption and stability for absorbent pads. This breakthrough overcomes limitations of traditional bio-based materials.

Keywords:

chitosan mechanical strength polyelectrolyte complex water absorption rate xerogel

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Area of Science:

Materials Science
Biomaterials Engineering

Background:

Traditional air-drying of bio-based xerogels causes structural collapse and performance issues.
This limits their use as absorbent pads.

Purpose of the Study:

To develop an air-drying collapse-resistant xerogel using chitosan and polyanions.
To evaluate its potential as an absorbent pad material.

Main Methods:

Chitosan (CS) combined with various polyanions (CMC, SA, HA, PT, XG) at different ratios.
Preparation of xerogels and evaluation of their structural integrity, porosity, water absorption, hardness, and toughness.
Characterization using FTIR, XRD, and SEM.

Main Results:

CS/CMC xerogel at a 1:3 ratio showed minimal shrinkage, high porosity, and superior water absorption (140% higher than CS/PT).
This xerogel exhibited enhanced hardness (96% higher than CS/SA and CS/HA) and toughness compared to CS/XG and CS/PT.
FTIR, XRD, and SEM confirmed a stable, homogeneous network formed by electrostatic interactions and potential amide bonds.

Conclusions:

CS/CMC xerogel demonstrates excellent comprehensive properties, making it ideal for absorbent pad applications.
The developed material overcomes the limitations of traditional xerogels, offering high absorption, stability, and structural integrity.