A novel biochar composite, Si-N@EBB2:1, has shown significant promise in removing dye from water, achieving an impressive dye removal efficiency of 96.03%. This composite is synthesized from eucalyptus bark modified with silica and nitrogen, using 3-aminopropyl triethoxysilane and diethylene triamine.

The study focuses on adsorbing Acid Blue 25 (AB25), a common dye in textile wastewater, which poses environmental risks. By optimizing conditions through response surface methodology, the research team found the best adsorption occurred at a specific pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More, adsorbent dosage, and contact time.

The composite’s effectiveness is underpinned by its adsorption capacity of 197.44 mg/g, fitting well within the Langmuir isotherm model, which suggests monolayer adsorption. The kinetic data further align with the pseudo-second-order model, indicating that chemisorption — a process involving chemical bonds between dye and adsorbent — predominantly drives the dye removal.

Characterization techniques such as scanning electron microscopy and Fourier transform infrared spectroscopy provide insights into the composite’s physical and chemical traits, affirming its robust structure and functional groups essential for dye sequestration.

This development not only addresses the crucial need for removing non-biodegradable contaminants from wastewater without secondary pollution but also utilizes sustainable materials, aligning with global environmental goals. This innovative approach leverages simple yet effective technology to enhance water quality and offers a greener alternative to traditional wastewater treatment methods.