Modeling of the Linear Equations of Langmuir Isotherm in the Adsorption of Cd (II) Ion with Siirt Kurtalan Koçpinar Clay

Abstract

Langmuir isotherm model has been widely used by researchers in adsorption isotherm studies for more than a century. During the process, 6 linear equations have been derived from the Langmuir model, which is a non-linear model. This study focuses on these 6 equations which are rarely given together. In this study, the performance of clay mineral in the removal of a heavy metal known for its harmful effect, such as cadmium, from solution was measured. The data obtained as a result of adsorption of cadmium (II) ion with clay from Siirt Koçpınar region at a temperature of 298 K were applied to 6 linear equations derived from Langmuir isotherm model. As a result, it was determined that the degree of suitability of the models for adsorption was type 3= type 6 < type 1= type 4 < type 2 = type 5 and the most suitable R2 values belonged to type 2 and type 5 with values of 0.992. The largest qm value was found to belong to type 4 with a value of 86,608 gmg-1.

Keywords

• Cadmium
• Langmuir
• Linear Regression
• Adsorption Constants
• Isotherm
• Clay

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