Electroresponsive Supramolecular Graphene Oxide Hydrogels for Active Bacteria Adsorption and Removal

Area of Science:

• Materials Science
• Biotechnology
• Environmental Engineering

Background:

• Bacterial contamination in drinking water and medical supplies poses significant health risks.
• Current sterilization methods, primarily size-exclusion filtration, are often slow and inefficient for large volumes.

Purpose of the Study:

• To develop an electroresponsive hydrogel for effective bacteria adsorption and removal.
• To engineer a reusable and cost-efficient sterilization technology for water and medical products.

Main Methods:

• Graphene oxide hydrogels were synthesized using redox-active ruthenium complexes as noncovalent cross-linkers.
• The hydrogels' properties were modulated by an applied electric field, altering ruthenium ion oxidation states.
• Bacteria adsorption capacity and inactivation via electric pulse were evaluated.

Main Results:

• The engineered hydrogels demonstrated strong bacteria adsorption capabilities, with 1 cm³ adsorbing up to 1 × 10⁸ E. coli.
• Adsorbed bacteria were effectively inactivated by a high-voltage electric pulse.
• The hydrogels exhibited reusability and a high bacteria removal rate.

Conclusions:

• Electroresponsive graphene oxide hydrogels offer a promising new approach for bacteria removal.
• This technology presents a viable, cost-effective solution for sterilizing medical products and purifying large volumes of drinking water.