Isotherms and thermodynamics by linear and non-linear regression analysis for the sorption of methylene blue onto activated carbon: Comparison of various error functions

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Vasanth V Kumar (Autor) Outra; Porkodi, K (Autor) Outra; Rocha, F (Autor) FEUP

Revista

Título: Journal of Hazardous Materials

Vol. 151 Nº 2

Páginas: 794-804

ISSN: 0304-3894

Editora: Elsevier

Indexação

ISI Web of Knowledge - 140 Citações

ISI Web of Science

Scopus - 156 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia civil

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

Outras Informações

ID Authenticus: P-004-17V

DOI: 10.1016/j.jhazmat.2007.06.056

Abstract (EN): A comparison of linear and non-linear regression method in selecting the optimum isotherm was made to the experimental equilibrium data of methylene blue sorption by activated carbon. The r(2) was used to select the best fill linear theoretical isotherm. In the case of non-linear regression method, six error functions, namely coefficient of determination (r(2)), hybrid fractional error function (HYBRID), Marquardt's percent standard deviation (MPSD), average relative error (ARE), sum of the errors squared (ERRSQ) and sum of the absolute errors (EABS) were used to predict the parameters involved in the two and three parameter isotherms and also to predict the optimum isotherm. For two parameter isotherm, MPSD was found to be the best error function in minimizing the error distribution between the experimental equilibrium data and predicted isotherms. In the case of three parameter isotherm, r2 was found to be the best error function to minimize the error distribution structure between experimental equilibrium data and theoretical isotherms. The present study showed that the size of the error function alone is not a deciding factor to choose the optimum isotherm. In addition to the size of error function, the theory behind the predicted isotherm should be verified with the help of experimental data while selecting the optimum isotherm. A coefficient of non-determination, K-2 was explained and was found to be very useful in identifying the best error function while selecting the optimum isotherm.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11