Removal of Chromium (VI) Ions from Aqueous Solution onto Micro Wave Assisted Activated Carbon Prepared from Phyillanthus Emblica Seeds

Abstract

The aim of this study is to evaluate adsorption isotherms, kinetics and thermodynamic parameters of Cr(vi) ions from aqueous solutions through adsorption technique using activated carbon prepared from Phyillanthus Emblica Seeds by using Micro Wave assisted Oven. The prepared carbon designated as Micro Wave assisted Phyillanthus Emblica Seeds Activated Carbon (MWPESAC). Experiments were carried out in a batch process. Effect of pH, activated carbon dosage and contact time with different initial Cr(vi) ion concentrations were investigated. Adsorption of Cr(vi) ion from aqueous solution onto the adsorbent was investigated by taking different initial concentrations at 305, 315, 325 & 335 K temperatures. Consequences obtained from the effect of initial concentrations and temperatures were discussed in detail. Kinetic data were fitted with Lagergren, Ho and Webber –Morris equations for pseudo first order and pseudo second order and intra particle diffusion models respectively. According to Mean of Sum of Squired Error (MSSE) tool, the adsorption followed pseudo second order kinetic equation. The equilibrium data were showed with Langmuir, Freundlich, Temkin and Dubinin-Radush-Kevich isotherm equations. Implications obtained from the isotherm parameters were discussed. . Thermodynamic parameters for such as ΔH, ΔS and ΔG were determined by means of Van’t Hoff plots. Investigation of these standards inferred that adsorption was spontaneous, endothermic with increased randomness. The consequences in this study designated that MWPESAC could be employed as an adsorbent for the adsorption of Cr(vi) ions from an aqueous solution.