Modelling of the synthetic dye Orange II degradation using Fenton's reagent: From batch to continuous reactor operation

• Type: Article in International Scientific Journal
• Date: 2009

Authors

ramirez, jh (Author) Other; duarte, fm (Author) Other; martins, fg (Author) FEUP; costa, ca (Author) FEUP; madeira, lm (Author) FEUP

Journal

Title: Chemical Engineering Journal

Vol. 148

Pages: 394-404

ISSN: 1385-8947

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 99 Citations

ISI Web of Science

Scopus - 118 Citations

COMPENDEX

INSPEC

Scientific classification

FOS: Engineering and technology > Environmental engineering

CORDIS: Technological sciences ; Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-003-K3A

DOI: 10.1016/j.cej.2008.09.012

Abstract (EN): In this work, a simple kinetic model was used to study the azo dye Orange II (O-II) degradation using Fenton's reagent, in the Fenton-like stage. The effects of pH, temperature. Cl(-) concentration and initial concentrations of O-II, hydrogen peroxide (H(2)O(2)) and ferrous ion catalyst (Fe(2+)) on the degradation rate have been investigated in a batch reactor. The apparent kinetic constants, k(ap), for O-II degradation were determined in the following ranges of experimental conditions: 2.0 <= pH <= 4.0, 283 K <= T <= 323 K, 0M <= C(cl)- <= 1 x 10(-2) M, 3 x 10(-5) M <= C(Ollo) <= 1 x 10(-4) M, 1 x 10(-4) M <= C(H2O2o) <= 1 x 10(-3) M and 2.5 x 10(-6) M <= C(Feo)(2+) <= 2 x 10(-5) M. A pseudo first-order reaction rate with respect to O-II concentration was found to be adequate to fit the data in these experiments, in which k(ap) depends on the initial conditions following a power-law dependency (at optimum pH of 3 and absence of chloride ions). This equation, without further fitting parameters, was successfully used to validate experiments performed in a continuous stirred tank reactor (CSTR). The ability of the model predictions was also checked by performing experiments in the CSTR out of the above-mentioned ranges (used for the kinetic study).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11