Adsorption of brilliant green dye onto activated carbon prepared from cashew nut shell by KOH activation: Studies on equilibrium isotherm

• Published in: Environmental research 2022-09, Vol.212 (Pt D), p.113497-113497, Article 113497
• Main Authors: Samiyammal, P., Kokila, A., Pragasan, L. Arul, Rajagopal, Rajakrishnan, Sathya, Rengasamy, Ragupathy, S., Krishnakumar, M., Minnam Reddy, Vasudeva Reddy
• Format: Article
• Language: English
• Subjects: Activated carbon; Adsorption brilliant green; Isotherms
• ISSN: 0013-9351; 1096-0953
• DOI: 10.1016/j.envres.2022.113497

Activated carbon from cashew nut shell via a potassium hydroxide (KOH) at 600 °C in an N2 atmosphere and their characteristics using FT-IR, XRD, SEM with EDS, and BET analysis was investigated. The cashew nut shell activated carbon obtained by KOH activation with a CNS/KOH ratio of 1:1 at 600 °C (N2 atmosphere) for 2 h had the highest surface area (407.80 m2/g) as compared to other ratio samples. Amongst, CNS/KOH ratios of 1:1 sample are used for the adsorbent, they are effects of contact time, pH, adsorbent dose, and initial dye concentration on brilliant green (BG) removal efficiency were studied. Moreover, the Langmuir and Freundlich adsorption models consisted utilized to affirm the adsorption isotherms. They are, best fitting for BG experimental equilibrium data was achieved with the Langmuir isotherm, giving a maximum BG adsorption capacity of 243.90 mg/g. •The activated carbon was prepared through the KOH activation method.•The characterizations of the prepared CNSAC have been determined by FT-IR, XRD, SEM with EDS and N2 adsorption and desorption isotherms.•The product exhibited large surface area with enhanced porosity.•The adsorbent possessed good adsorption ability towards brilliant green dye.