Synthesis of multicarboxylic hyperbranched polyglycerol (HPG) modified monodisperse superparamagnetic poly (glycidyl methacrylate) microspheres for capable dye adsorption

The article addresses the critical issue of water pollution caused by dyes, which are prevalent in industrial effluents from sectors such as textiles and paper. It introduces a novel approach to mitigate this problem through the synthesis of multicarboxylic hyperbranched polyglycerol (HPG) modified monodisperse superparamagnetic poly (glycidyl methacrylate) (PGMA) microspheres. These microspheres exhibit exceptional adsorption capabilities for cationic dyes, particularly methylene blue (MB) and rhodamine 6G (R6G), which are commonly used in various industrial applications. The synthesis process involves a two-step activated swelling method followed by surface modification, resulting in microspheres with uniform particle size and high reactivity. The modified microspheres demonstrate superior adsorption performance due to their abundant hydrophilic functional groups and magnetic properties, which facilitate easy separation and regeneration. The article provides a detailed characterization of the microspheres, including their structural, thermal, and magnetic properties, as well as their adsorption kinetics and isotherms. The results indicate that the PGMA-HPG-COOH adsorbent has a high adsorption capacity and fast adsorption rate, making it a promising candidate for the removal of cationic dyes from wastewater. Furthermore, the adsorbent shows excellent regeneration properties, retaining most of its original adsorption capacity after multiple cycles, which is crucial for practical applications and economic viability.