10.1016/j.ultsonch.2016.09.004
The research investigates the use of ultrasound-assisted removal of Acid Red 17 (AR17) dye using Fe3O4-loaded coffee waste hydrochar (Fe3O4-CHC) as an adsorbent. The study aims to develop an effective method for treating wastewater containing organic dyes, which pose significant environmental and health risks due to their toxic and carcinogenic effects. The Fe3O4-CHC was synthesized through a simple precipitation method and characterized using various techniques such as SEM, TEM, EDX, XRD, BET, and FT-IR. The results showed that the specific surface area of the hydrochar increased from 17.2 to 34.7 m2/g after loading Fe3O4 nanoparticles, enhancing its adsorption capacity. The ultrasound-assisted process significantly improved the removal efficiency of AR17, achieving 100% decolorization under optimal conditions. The study concluded that Fe3O4-CHC is a promising adsorbent for dye removal, with good stability and reusability, and the high correlation coefficient from the Langmuir model indicated monolayer adsorption of dye molecules on the Fe3O4-CHC surface.