REMOVAL OF METHYLENE BLUE DYES FROMAQUEOS SOLUTIONBYUSING ACTIVATED CARBON PREPARED FROMSTEMPARTOFCROTON MACROSTACHYUS (BISANA)

Abstract

In this study activated carbon was prepared from Stem part of Croton macrostachyus andutilizedas adsorbent to study its adsorption ef iciency towards removal of Methylene blue dye fromaqueoussolution. The AC was prepared by acid treatment and calcinated in muf le furnace at dif erenttemperature ranging from 400 0C to 700 0C. The prepared AC was characterized by usingFT-IRandscanning electron microscope (SEM).FT-IR results showed that dif erent functional groupslikehydroxyl, aldehydes, and carbon-carbon double bond functional groups were observed at dif erentwave numbers. The amount of MB dyes adsorbed was determined using UV-Vis spectrometeryat itsλ max of 664 nm. It was found that the adsorption of MB on adsorbent obeys the Langmuiradsorption isotherms. The Values of the equilibrium parameter ‘RL’ from the Langmuir isothermwas0.040. These results confirmed that the adsorption process of MB dye on the preparedActivatedcarbon is favorable.The ef ects of some working parameters like pH, dye initial concentration, temperature and contact time on the adsorption of MB dyes were also studied. The optimumconditions were maximum removal ef iciency occur was at dose of 0.1 gram, initial concentrationof10 ppm, contact time of 90 minutes, pH of 8 and temperature of 45 0C. The dye adsorptionwas foundto decrease with increasing initial dye concentration and the percentage removal of the dyeandtheamount adsorbed on the surface of the adsorbent both showed significant increase with increaseintemperature up to 45 oC. The ef ect of contact time on the percent removal of MBdyeshowedincreasing trend as the reaction time increase. It was observed that the pseudo-second-order kineticmodel fits better with good correlation coef icient and the equilibrium data fitted well withlangmuirmodel.