Sunflower husks coated with copper oxide nanoparticles for reactive blue 49 and reactive red 195 removals: Adsorption mechanisms, thermodynamic, kinetic, and isotherm studies

• Main Authors: Alhares, Hasanain Saad, Shaban, Mohammed Ali A., Salman, Mohammed Sadeq, Ridha, Mohanad J. M. J., Mohammed, Sabah J. J., Abed, Khalid M. M., Ibrahim, Mohammed A. A., Al-Banaa, Ali K. K., Abu Hasan, Hassimi
• Format: Article
• Published: Springer International Publishing AG 2023
• Subjects: GE Environmental Sciences; TP Chemical technology
• Online Access: http://eprints.um.edu.my/38931/

The adsorption process of reactive blue 49 (RB49) dye and reactive red 195 (RR195) dye from an aqueous solutions was explored using a novel adsorbent produced from the sunflower husks encapsulated with copper oxide nanoparticle (CSFH). Primarily, the features of a CSFH, such as surface morphology, functional groups, and structure, were characterized. It was determined that coating the sun-flower husks with copper oxide nanoparticles greatly improved the surface and structural properties related to the adsorption capacity. The adsorption process was successful, with a removal efficiency of 97% for RB49 and 98% for RR195 under optimal operating conditions, contact time of 180 min, pH of 7, agita-tion speed of 150 rpm, initial dye concentration of 10 mg/L, CSFH mass of 0.2 g/100 mL dye solution, and temperature of 25 degrees C. According to findings of thermodynamic, adsorption process was a spontane-ous, chemical, and endothermic with increased vari-ability at the solid-solution interface during the stabi-lization of the reactive dyes onto the adsorption active sites. The second-order kinetic model fits the experi-mental results better, indicating that the chemisorp-tion mechanism controls the adsorption of RB49 and RR195. Meanwhile, the Sips isotherm best fitted to RB49 and RR19, indicating that both heterogeneous and homogenous adsorptions occurred. The findings suggest that CSFH has potential use as an efficient and profitable adsorbent for removing reactive dyes from aqueous solutions.