Methylene blue adsorption capacity and coherent isotherm model of commercial activated carbon

Abstract

The use of dyes that pollute the earth and adversely affect the health of human beings is increasing day by day and it is important to remove them from nature. Methylene blue (MB), which is one of the most commonly used dyestuffs that affects natural life negatively, was the subject of this study. In this study, the adsorption mechanism of commercial activated carbon to remove MB was investigated. In the study, activated carbon was added to MB solution taken in different concentrations and the results were applied to ten different adsorption isotherms which are Langmuir, Freundlich, Temkin, Harkins-Jura, Halsey, Dubinin- Radushkevich, Janovich, Redlich-Peterson, Henry's and Hills. Adsorption isotherm graphs were drawn with the obtained results and constant parameters in adsorption isotherm equations were calculated through graphics. The adsorption mechanism was examined according to the correlation coefficients(R 2 ) from the graphs obtained. The highest correlation coefficients were calculated as 0,9993 and 0,9954 from Redlich-Peterson and Langmuir isotherm equations respectively. Adsorption isotherm was coherent Langmuir and maximum adsorption capacity was determined 208,3 mg/g.