REMOVAL OF GOLDEN YELLOW 28 DYE FROM AQUEOUS SOLUTION USING THERMO-CHEMICAL MODIFIED PEANUT SHELL ACTIVATED CHARCOAL

In this study, modified activated carbon from agro by-product (peanut shell) has been successful-ly produced through chemical activation process using sodium hydroxide (NaOH) as an activat-ing agent and also the effect of activation agent and carbonization temperatures on adsorption efficiency, surface characteristics and yield were studied. To produce modified activated carbon, samples were heated to the final carbonization temperatures 400, 500 and 600oC respectively un-der a continuous pure nitrogen flow (99.6%) and at a heating rate of 10oC/min with an activation time150min. The physicochemical properties of the raw peanut shell and sodium hydroxide modified peanut shell based activated carbon were characterized by BET, FT-IR, XRD, pHPZC and proximate analysis. The adsorption efficiency tests were performed in the batch adsorption system at different initial concentrations of GY 28 dye 30-150 ppm, contact time 10-90 min, and solution pH 2-10 with 100ml volume of solution at constant solution temperature 25+5°C and 150rpm with 0.5gm of base modified activated carbon @500oC. This modified adsorbent (BM5) removes 83.3% and 25 mg/gm of the GY 28 dye from aqueous solution at optimal pH of 10 and 60 min with fixed amount of adsorbent, 0.5gm. The equilibrium data was analyzed by Freundlich and Langmuir isotherm models. Finally, the rate of the adsorption process was investigated using Pseudo first and Pseudo second order kinetic models.