Paraquat removal from water by oxidation with Fenton's reagent

• Type: Article in International Scientific Journal
• Date: 2011-11

Authors

Mónica S. F. Santos (Author) FEUP; A. Alves (Author) FEUP; Luís M. Madeira (Author) FEUP

Journal

Title: Chemical Engineering Journal

Vol. 175 No. 1

Pages: 279-290

ISSN: 1385-8947

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 50 Citations

ISI Web of Science

Scopus - 85 Citations

INSPEC

Associated Projects

SECUREAU - Security and decontamination of drinking water distribution systems following a deliberate contamination

ACQUASAFE - Segurança química em sistemas de abastecimento de água

Other information

Authenticus ID: P-002-JM4

DOI: 10.1016/j.cej.2011.09.106

Abstract (EN): Fenton's reaction, an advanced oxidation process (AOP), was studied for paraquat degradation purposes. A parametric study was conducted and the variables considered were the temperature, the pH and the initial iron, hydrogen peroxide and paraquat concentrations, the latter in the range 50-200 mg/L. Under the optimum conditions (T = 30.0 degrees C, [Fe(2+)](0) = 5.0 x 10(-4) M, [H(2)O(2)](0)=1.6 x 10-2 M, and pH(0) = 3.0, for [PQ](0) = 100 mg/L), complete paraquat degradation and about 40% of mineralization were reached after 4h of reaction (batch reactor). Gramoxone commercial product revealed a slower initial rate of degradation than the paraquat analytical standard, probably due to the parallel consumption of the hydroxyl radicals by other organic compounds. A semi-empirical kinetic model was proposed to simulate the paraquat dichloride concentration histories under a wide range of conditions; the adequacy of the model was statistically checked and also validated by comparison with some additional experiments. The biodegradability and toxicity of the final oxidation products were assessed.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12