Benzene, toluene and o-xylene (BTX) removal from aqueous solutions through adsorptive processes

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Fabíola V. Hackbarth (Author) Other; Vítor J. P. Vilar (Author) FEUP; Geerlesson B. De Souza (Author) Other; Selene M. A. Guelli U. De Souza (Author) Other; Antônio Augusto U. De Souza (Author) Other

Journal

Title: ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY

Vol. 20 No. 4

Pages: 577-590

ISSN: 0929-5607

Publisher: Springer

Indexing

ISI Web of Knowledge - 10 Citations

ISI Web of Science

Scopus - 18 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

CORDIS: Technological sciences > Technology > Environmental technology

Associated Projects

LA 20 - PROJECTO ESTRATÉGICO - LA 20 - 2013-2014

Other information

Authenticus ID: P-009-B3H

DOI: 10.1007/s10450-014-9602-3

Abstract (EN): In this study, the monocomponent adsorption of benzene, toluene and o-xylene (BTX) compounds, as model contaminants present in the petrochemical wastewaters, was investigated using three types of adsorbents: activated carbon (Carbon CD 500), a polymeric resin (MN-202) and a modified clay (Claytone-40). Langmuir and Freundlich models were able to fit well the equilibrium experimental data. The BTX adsorption capacity increased in the following order: Claytone-40 < CD 500 < MN-202. The maximum uptake capacity of MN-202, given by the Langmuir fitting parameter, for benzene, toluene and o-xylene was 0.8 +/- A 0.1, 0.70 +/- A 0.08 and 0.63 +/- A 0.06 mmol/g at 26 A degrees C. Desorption kinetics for polymeric resin with 50 % methanol solution were fast being able to reuse the resin in consecutive adsorption/desorption cycles without loss of sorption capacity. The adsorptive behaviour at batch system was modelled using a mass transfer kinetic model, considering that the sorption rate is controlled by a linear driving force model, which successfully predicts benzene, toluene and o-xylene concentration profiles, with homogeneous diffusivity coefficients, D (h) , between 3.8 x 10(-10) and 3.6 x 10(-9) cm(2)/s. In general, benzene diffuses faster than toluene and o-xylene, which is in agreement with molecular diffusivity in water.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14