Bulrush Biomass and Copper Yield Green Adsorbent for Wastewater Dyes
Researchers at Doshisha University used a single-step co-pyrolysis process to convert bulrush biomass and a copper precursor into an adsorbent material. The resulting composite removes synthetic dyes from wastewater without hazardous chemical reducing agents. The approach aims to address persistent dye pollution from textile and other industrial wastewater.
The Doshisha team, led by Asif Ali with Michiaki Matsumoto and Yoshiro Tahara, reported the work in the Journal of Environmental Chemical Engineering. They combined bullrush waste with copper(II) nitrate trihydrate and potassium hydroxide, then co-pyrolyzed the mixture in one step. Gases released by the biomass itself, carbon monoxide and hydrogen, reduced the copper precursor, forming zero-valent copper nanoparticles inside a mesoporous carbon framework.
The resulting ZVCu@BAC had a surface area of 984.5 m²/g and pore volume of 0.615 cm³/g. The proposed mechanism suggests it can adsorb both cationic Methylene Blue and anionic dyes such as Methyl Orange and Sunset Yellow through electrostatic attraction, pore filling, hydrogen bonding, π–π stacking, and coordination with metallic copper sites.
This material could offer textile, paper, leather, and food processors a lower-cost route to treat dye-laden wastewater, potentially reducing releases that may harm aquatic life and communities reliant on waterways. Because it uses agricultural waste and avoids added reducing chemicals, it may also lessen waste and chemical handling burdens. However, real-world adoption would depend on scalability, regeneration, and performance across varied effluents.