REMOVAL OF RHODAMINE B FROM AQUEOUS SOLUTION BY USING PINE CONE ACTIVATED WITH HNO3

Year 2021, Volume: 16 Issue: 3, 123 - 132, 30.09.2021

Meryem Gören , Hatice Begüm Murathan , Nihan Kaya , Atilla M. Murathan

Abstract

In the experimental study, optimum conditions were determined for the adsorption of Rhodamine B dye, which is frequently used in the textile industry, on modified pine cone adsorbent. It was observed that the adsorption duration, solution pH, temperature and initial dye concentration affected the adsorption capacity of HNO3 activated pine cone. The maximum dye removal efficiency was found to be 97% on pine cone pretreated with HNO3 at T = 55 oC, pH = 3, Co=10-4 M dye concentration. Experimental data were applied to pseudo first order and pseudo second order kinetic models and Langmuir and Freundlich adsorption isotherms for investigating rate and kinetics of adsorption process. Kinetic analyzes demonstrated that the experimental data were highly compatible with the pseudo second order kinetic model. Besides it was seen that the equilibrium values were represented by the Langmuir isotherm equivalence for the whole process. From the calculations made as a result of thermodynamic studies, (∆Ho) and (∆So) were found to be positive, while (∆Go) was found to be negative. As a result, in this study, the applicability of pine cones, which is a cheap and natural material that can be used in the removal of dyestuffs from aqueous media, has been demonstrated.

Keywords

Adsorption, cationic dye, pine cone, rhodamine B

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