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

Abstract

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@catechin assembly structure has significant potential for advancing the field of wastewater treatment.