Methylene blue adsorption from aqueous solution using activated carbon of spathodeacampanulata

• Published in: Results in engineering 2024-03, Vol.21, Article 101910
• Main Authors: Dimbo, Derese, Abewaa, Mikiyas, Adino, Eba, Mengistu, Ashagrie, Takele, Temesgen, Oro, Abebe, Rangaraju, Magesh
• Format: Article
• Language: English
• Subjects: Activated carbon; Adsorption; Methylene blue; Spathodea campanulata; Wastewater treatment
• ISSN: 2590-1230; 2590-1230
• DOI: 10.1016/j.rineng.2024.101910

This study aimed to determine the effectiveness of Spathodea Campanulata derived activated carbon in removing methylene blue (MB) from wastewater. The activated carbon was prepared through chemical impregnation with H3PO4 and thermal activation at 500 °C for 2 h. The adsorption experiments were optimized using 24 full factorial designs, considering pH, contact time, initial MB concentration, and adsorbent dosage as parameters. The characterization of the activated carbon revealed favorable properties, including multiple surface functional groups, a maximum specific surface area of 1054 m2/g, and a highly porous surface morphology. The optimized conditions achieved a maximum removal efficiency of 99.95%, with pH 9, a contact time of 120 min, a dye concentration of 90 mg/L, and an adsorbent dosage of 0.2 g/100 mL being the most effective parameters. The Freundlich isotherm model provided the best fit to the experimental data, indicating a heterogeneous and multilayer adsorbent surface. The kinetics study indicated that chemisorption was the primary mechanism. In conclusion, the study indicated that Spathodea Campanulata based activated carbon could serve as a cost-effective adsorbent for removing MB from aqueous solutions •Methylene saturated wastewater poses serious harm to human health and environmental ecology.•Spathodea campanulata based activated is a good adsorbent material characterized by a large specific surface area of 1054 m2/g.•The maximum methylene blue removal of 99.95% highlights the effectiveness of Spathodea campanulata based activated carbon.•The interactive regression model represents the adsorption pattern of Methylene blue indicating the significance of the interaction effect.•Freundlich isotherm model accurately fits the batch adsorption data showing the multilayer adsorption surfaces.