Volume No. 11 Issue No.: 3 Page No.: 482-499 January-March 2017
ADSORPTIVE REMOVAL OF CATIONIC DYE, METHY- LENE BLUE FROM AQUEOUS SOLUTION USING RIND OF ORANGE (Citrus sinensis)(L.)OSBECK
Shrimant V. R. and Sandip D. Maind*
Department of Chemistry, Bharatiya Vidya Bhavan’s Hazarimal Somani College of Arts and Science, Mumbai (INDIA)
Received on : December 12, 2016
Adsorptive removal of cationic dye, methylene blue from aqueous solution using rind of orange (Citrus sinensis) (L.) Osbeck was investigated. The adsorbent was characterized by FTIR and SEM. The point of zero charge (pHpzc) of adsorbent, which determine the pH at which the adsorbent surface has net electrical neutrality was experimentally found to be 5.90. The batch experiments were performed in order to optimize the various parameters such as solution pH, adsorbent dose, initial dye concentration, contact time and temperature. Equilibrium data were well described by typical Langmuir, Freundlich,Dubinin-Kaganer-Redushkevich (DKR) and Temkin adsorption isotherm models. Langmuir adsorption isotherm model provided a better fit with the experimental data. The maximum adsorption capacity of dye, methylene blue which was determined from Langmuir adsorption isotherm model was found to be 35.971 mg per g of adsorbent. Furthermore, a detailed analysis has been conducted by testing simple chemical reaction kinetic models such as pseudo-first-order, pseudo-second-order, Elovich and Weber and Morris intra-particle diffusion. A prediction based on the so-called pseudo-second-order kinetic model was found in satisfactory accordance with experimental data which suggests that adsorption is chemical sorption controlled. Thermodynamic study revealed that the adsorption process was spontaneous, endothermic and increasing randomness of the solid solution interfaces. The rind of orange (Citrus sinensis) (L.) was found to remove dye, methylene blue very effectively from aqueous solutions and can be recommended for removal of dye from colored effluents.
Keywords : Adsorption, Methylene blue, Rind of orange (Citrus sinensis) (L.) Osbeck, Adsorption isotherms, Adsorption kinetics