Adsorption isotherm, kinetic and mechanism studies of crystal violet dye by activated carbon from sugarcane leaves

Suchada Sawasdee; Prachart  Watcharabundit

Suchada Sawasdee Department of Chemistry, Faculty of Science and Technology, Thepsatri Rajabhat University
Prachart Watcharabundit Department of Chemistry, Faculty of Science and Technology, Thepsatri Rajabhat University

Keywords: Adsorption, crystal violet, activated carbon, sugarcane leaves, mechanism

Abstract

In this study, the activated carbon was prepared from sugarcane leaves under the chemical activation with NaCl for the adsorption of crystal violet dye in aqueous solution. The effect of various parameters, such as pH (2-10), contact time (10-420 min), and initial dye concentration (25-300 mg/L) were investigated. The results showed that the equilibrium adsorption data were better described by the Langmuir than the Freundlich and Dubinin-Radushkevich isotherm models, and the maximum adsorption capacity was found to be 9.47 mg/g at 30°C. The kinetic data of adsorption were analyzed by pseudo-first-order, pseudo-second-order, and intraparticle diffusion models, and the kinetic results agreed well with the pseudo-second-order model. Thermodynamically, the process was spontaneous and endothermic. The mechanisms of crystal violet adsorption onto activated carbon were electrostatic attraction, hydrogen bonding, Yoshida hydrogen bonding and n-p interaction.

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