Self-Reactive Carbon Dioxide Absorbent with Sodium Carbonate-Based Hydrogel

Area of Science:

• Materials Science
• Food Packaging Technology
• Chemical Engineering

Background:

• Sodium carbonate is a cost-effective food additive and CO2 absorbent.
• Current solid sodium carbonate applications in food packaging are limited by the need for external moisture and reduced performance at low temperatures.
• This necessitates the development of advanced CO2 absorbents for improved food preservation.

Purpose of the Study:

• To develop a self-reactive sodium carbonate-based hydrogel (SCH-PAAS) for CO2 absorption in food packaging.
• To evaluate the CO2 absorption capacity and rate of the SCH-PAAS, particularly under low-temperature conditions.
• To demonstrate the suitability of SCH-PAAS for fresh food packaging applications.

Main Methods:

• Synthesis of a sodium carbonate hydrogel incorporating polyacrylic acid sodium salt (PAAS).
• Characterization of the hydrogel's CO2 absorption performance at varying PAAS concentrations and temperatures (10 °C and 25 °C).
• Analysis of the hydrogel's structural properties and gas-liquid contact area.

Main Results:

• The developed SCH-PAAS hydrogel exhibits self-reactivity and high CO2 absorption capacity without external moisture.
• Increased PAAS content enhanced CO2 absorption rates, with faster absorption observed at 10 °C compared to 25 °C.
• SCH-PAAS demonstrated significantly improved low-temperature absorption performance compared to conventional sodium carbonate materials.

Conclusions:

• The novel SCH-PAAS hydrogel effectively overcomes the limitations of traditional sodium carbonate absorbents for food packaging.
• Its enhanced low-temperature CO2 absorption makes it ideal for preserving fresh foods under refrigeration.
• The material's self-reactivity and porous structure contribute to its high absorption efficiency and suitability for commercial applications.