Multi-functional nanocomposite hydrogels based on assembled catechin-modified TiO2 nanoparticle crosslinker for efficient dye removal from wastewater

The removal of contaminants from wastewater is a crucial step towards achieving sustainable development. Nanocomposite hydrogels have emerged as effective adsorbents; however, their limited elasticity, low light transmission, and insufficient self-healing properties hinder their practical applications. Here, we present durable and self-repairing nanocomposite hydrogels produced by free radical polymerization using an assembled structure of TiO2 and catechin, which acts as a crosslinking agent. This assembly enhances the hydrogel's mechanical properties and provides UV shielding and antioxidant features. This hydrogel, with its well-dispersed TiO2, can be activated by UV light to effectively eliminate heavy metal ions and degrade dye molecules from wastewater. These exceptional qualities demonstrate that the nanocomposite hydrogel based on the TiO2@ca-techin assembly structure has significant potential for advancing the field of wastewater treatment.

Automated summary

In this study, durable and self-repairing nanocomposite hydrogels were successfully synthesized using an assembled structure of TiO2 and catechin. The hydrogel exhibited excellent mechanical properties, UV shielding, and antioxidant features, and demonstrated effective removal of heavy metal ions and degradation of dye molecules.