Modeling the biosorption of basic dyes from binary mixtures
- PDF / 1,548,658 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 3 Downloads / 219 Views
Modeling the biosorption of basic dyes from binary mixtures M. E. Fernandez • P. R. Bonelli • A. L. Cukierman N. O. Lemcoff
•
Received: 20 August 2014 / Revised: 24 January 2015 / Accepted: 2 February 2015 Springer Science+Business Media New York 2015
Abstract The biosorption of basic dyes, methylene blue and rhodamine B, from binary aqueous solutions onto cypress cone chips, was analyzed through mathematical modeling. This study aimed at introducing a novel model to predict the dynamic binary sorption of the dyes. It consisted of a modified Langmuir multicomponent isotherm coupled with a linear driving force model. Experimental data from recent studies using the untreated and alkaline-treated biosorbent was used to determine the model parameters, and the breakthrough predictions are in good agreement with the experimental results. Useful information on the effects of bed length and feed concentration on the breakthrough time and mass transfer length was obtained. This can guide the design and optimization of the biosorbent column. Keywords Modeling
Biosorption Basic dyes Dynamic studies
1 Introduction Industrial effluents are often contaminated and need to be processed before their discharge in bodies of water. One
M. E. Fernandez P. R. Bonelli A. L. Cukierman Programa de Investigacio´n y Desarrollo de Fuentes Alternativas de Materias Primas y Energı´a-PINMATE, Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina N. O. Lemcoff (&) Department of Engineering and Science, Rensselaer Polytechnic Institute Hartford, 275 Windsor Street, Hartford, CT 06120, USA e-mail: [email protected]
group of contaminants are the dyes used in textile, paper and plastic industries. In particular, dyes used by the textile industry are mainly synthetic and derived from either coal tar or petroleum-based intermediates (US EPA 1997). Most dyes are classified either as acid or basic dyes, and its use depends on the substrate involved. Acid dyes contain sulfonic acid groups and are preferentially used with protein fibers. Basic dyes are cationic salts which can interact with the surface of the substrate, and are mainly used with wool, silk and some acrylic fibers (Pereira and Alves 2012). Activated carbons are the traditional adsorbents used for dyes, but a large number of alternative low-cost adsorbents have also been reported in the literature (Gupta and Suhas 2009). Adsorption studies are usually carried out in batch systems, and both kinetic and equilibrium data for single and/or multicomponent mixtures is obtained. The experimental results are modeled using mainly Langmuir and Freundlich isotherms, multilayer models, and the ideal adsorption solution (IAS) theory (Walker and Weatherley 2000, Ozcan et al. 2004, Turabik 2008, Crini and Badot 2008, Noroozi and Sorial 2013). The kinetic uptake is represented in most cases by general rate models (pore diffusion, surface diffusion), linear driving force (LDF) model, and pseudo first and
Data Loading...
