ORIGINAL RESEARCH
Optimum Isotherm Parameters for Reactive
Azo Dye onto Pistachio Nut Shells:
Comparison of Linear and Non-Linear Methods
Bulent Armagan1, Fatih Toprak2
1Environmental Engineering Department, Faculty of Engineering, Istanbul University,
34320 Istanbul, Turkey
2Dimin Mining Co. Diyarbakir, Turkey
34320 Istanbul, Turkey
2Dimin Mining Co. Diyarbakir, Turkey
Pol. J. Environ. Stud. 2013;22(4):1007–1011
KEYWORDS
ABSTRACT
omparison analysis of linear least-square method and non-linear method of three widely used
isotherms (Langmuir, Freundlich, and Redlich-Peterson) were examined to experiment with Remazol Red
(C.I. 18221) onto pistachio nut shells at a solution temperature of 293 K. All three isotherm equations showed
a better fit to the experimental equilibrium data. The results show that the Langmuir model shows the best fit
compared to Freundlich and Redlich-Peterson models using the linear method. However, when using the nonlinear
method the Freundlich and Langmuir models show the best fit compared to others. Redlich-Peterson
isotherm is a special case of Langmuir isotherm when the Redlich-Peterson isotherm constant g was unity.
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