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

Environ Res. 2022 Sep;212(Pt D):113497. doi: 10.1016/j.envres.2022.113497. Epub 2022 May 23.

Abstract

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.

Keywords: Activated carbon; Adsorption brilliant green; Isotherms.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Anacardium*
  • Charcoal
  • Hydrogen-Ion Concentration
  • Hydroxides
  • Kinetics
  • Nuts / chemistry
  • Potassium Compounds
  • Quaternary Ammonium Compounds
  • Spectroscopy, Fourier Transform Infrared
  • Water Pollutants, Chemical* / analysis

Substances

  • Hydroxides
  • Potassium Compounds
  • Quaternary Ammonium Compounds
  • Water Pollutants, Chemical
  • Charcoal
  • brilliant green
  • potassium hydroxide