Hydrogel-Based Sensor for the Detection of Iron Ions and Excessive Alerting

Area of Science:

• Materials Science
• Environmental Science
• Analytical Chemistry

Background:

• Heavy metal ion contamination in water poses significant risks to human health and ecosystems.
• Developing sensitive and straightforward water quality monitoring methods is crucial.

Purpose of the Study:

• To construct a dual-network hydrogel for sensitive and convenient detection of iron(III) ions (Fe3+).
• To explore the application of this hydrogel in water quality and human health monitoring.

Main Methods:

• Synthesis of a dual-network hydrogel: poly(acrylic acid-co-N-methylolacrylamide)/poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (P(AA-co-N-MA)/PEDOT:PSS).
• Utilizing the hydrogel's conductivity changes in response to Fe3+ concentration for detection.

Main Results:

• The P(AA-co-N-MA)/PEDOT:PSS hydrogel demonstrated high sensitivity and convenience for Fe3+ detection.
• Achieved a lower limit of detection of 0.52 ppm (0.06 S/m) for human health monitoring and a threshold of 0.16 S/m for water quality monitoring.

Conclusions:

• The developed hydrogel offers a promising platform for sensitive Fe3+ detection in water.
• Its conductivity-based response enables integration with electronic devices for early warning systems in human health monitoring.