POS7-0848
Functionalized Biomass Derived Hydrochar Microspheres for Selective Dye Removal from Wastewater
Topic
S7. Innovations in Polymeric Composites: From Design and Processing to Industrial Applications
When and Where
Sep 30, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Heesuk KIM
Jinhye BAE
Presenter(s)
Iqra Qayyum (Chonnam National University)
Co-Author(s)
Abstract
The efficient removal of cationic dyes from industrial wastewater remains challenging because of their chemical stability and persistent coloration. Herein, we rationally designed beta cyclodextrin grafted activated hydrochar, referred to as beta CD g AHC, microspheres as a multifunctional adsorbent integrating biomass derived carbon chemistry, supramolecular recognition, and hierarchical porosity. Hydrochar derived from biomass underwent NaOH based cold alkali activation to generate a mesoporous carbon scaffold enriched with surface hydroxyl groups. Beta CD was covalently grafted via epichlorohydrin crosslinking to form a selective supramolecular host layer. The hybrid microspheres were fabricated by embedding beta CD g AHC within an alginate matrix, producing a highly porous and accessible adsorption platform. Adsorption studies toward crystal violet, methylene blue, and rhodamine B revealed high uptake capacities and favorable monolayer adsorption behavior, outperforming many reported cyclodextrin based adsorbents. Equilibrium and kinetic analyses indicated strong adsorption affinity and rapid dye capture. Mechanistic investigations confirmed the synergistic contributions of electrostatic attraction, hydrogen bonding, and host guest complexation. Importantly, the adsorbent exhibited excellent regeneration stability, minimal beta CD leaching, and strong selectivity for cationic dyes in real industrial wastewater containing competing species. This cost effective and sustainable approach provides a scalable platform for advanced dye removal with regeneration capability, thereby advancing practical environmental remediation solutions.
