Kinetic, equilibrium and thermodynamic study of 2-chlorophenol adsorption ontoRicinus communispericarp activated carbon from aqueous solutions

Abstract

This study reports on the adsorption of 2-chlorophenol from an aqueous solution using activated carbon prepared by H 2 SO 4 activation of the pericarp of Ricinus communis (RCAC). The pericarp was carbonized and activated by treating with H 2 SO 4 solution followed by heating in an oven at 105°C for 12 hrs. Batch adsorption experiments were carried out as a function of pH, contact time, initial concentration of the adsorbate, adsorbent dosage and temperature of the solution. Kinetic data were best fit to a pseudo-first-order rate equation for the adsorption of 2-chlorophenol on RCAC. Thermodynamic parameters ΔH o , ΔS o and ΔG o for the adsorption were also determined which shows that adsorption on the surface of RCAC was spontaneous in nature, and exothermic between temperatures of 20°C and 80°C. The equilibrium data better fit the Langmuir isotherm model for 2-chlorophenol adsorption on RCAC. IR spectrum for loaded and unloaded RCAC was obtained and found to be in good agreement. ARTICLE HISTORY

Kinetic and Thermodynamic Study of Phenol Removal from Water Using Activated Carbon Synthesizes from Avocado Kernel Seed

“…Equilibrium studies were carried out by taking 0.3 g powdered activated Carbon with 25 mL phenol solution of different initial concentrations (10,20,30,50,60, and 70 μg/L) for the aqueous solution of phenol in twelve (250mL) conical flask. The pH of the solutions was adjusted to 6.0 by adding either 0.1 M HCl or 0.1 M NaOH solutions.…”

“…This technique is quite popular due to the availability of a wide range of adsorbents, which makes it an effective and attractive process for the removal of non-biodegradable pollutants (including dyes and phenolic compounds) from wastewater [18,19]. Activated carbon due to its extended surface area, high adsorption capacity, microporous structure and special surface reactivity makes it one of the most effective adsorbents for organic compounds removal [20,21]. Hence, this study was conducted to increase the characteristics adsorption of phenolic compounds from drinking and aqueous solution using both K 2 CO 3 and HCl as an activating agent and was also compared the adsorption capacity of activated carbons based on solution pH, contact time, the initial concentration of adsorbate, adsorbent doses, and temperature effect.…”

Saccharomyces cerevisiaeimmobilized onto cross-linked chitosan beads: application of a novel material for the removal of dye toxicity

“…Therefore, entropy values tend to be positive in the S. cerevisiae biomass [39]. These results also indicate that the association of the adsorbate at the solid-liquid interface becomes more random for all adsorbents [38].…”

“…Thermodynamic studies help us understand the nature of adsorption by analysing changes in Gibbs free energy (DG), entropy (DS) and enthalpy (DH) [38]. Equation 12 in which qe/Ce is the equilibrium constant obtained during temperature variation (mol g −1 ), T is the temperature (K) and Rg is the universal gas constant (8.314 J mol −1 K −1 ).…”

An approach to textile dye removal using sawdust from Aspidosperma polyneuron

“…The Rl value indicates whether the type of isotherm is irreversible (Rl = 0), favourable (0 < Rl < 1), linear (Rl = 1) or unfavourable (Rl > 1) [20].…”