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Titre du document / Document title

Degradation of melatonin by UV, UV/H2O2, Fe2+/H2O2 and UV/Fe2+/H2O2 processes

Auteur(s) / Author(s)

XU Xiang-Rong (1) ; LI Xiao-Yan (2) ; LI Xiang-Zhong (1) ; LI Hua-Bin (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Kowloon, HONG-KONG
(2) Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, HONG-KONG
(3) School of Biological Sciences, The University of Hong Kong, Pokfulam Road, HONG-KONG

Résumé / Abstract

Melatonin is a hormone, which may suppress the production of testosterone, decrease semen quality, and affect sexual activity and reproduction of animals and humans. Degradation of melatonin in aqueous solutions were investigated and compared by different advanced oxidation processes, including ultraviolet radiation (UV) alone, ultraviolet radiation assisted by hydrogen peroxide (UV/H2O2), Fenton's reagents (Fe2+/H2O2), and combination of Fenton's reagent with UV light (photo-Fenton, UV/H2O2/Fe2+). The exper- iments were conducted in a laboratory-scale batch photoreactor equipped with a 8W low-pressure mercury lamp. The degradation of melatonin by all these processes was found to follow pseudo-first-order reaction kinetics. The effect of pH on the degradation of melatonin in the UV irradiation process was studied, and found that removal efficiencies of melatonin were 18%, 28% and 32% at 60 min and the rate constants were 0.0018, 0.0030 and 0.0048 min―1 at pH value of 4.0, 7.0 and 10.0, respectively. The degradation efficiency of melatonin was greatly enhanced by UV/H2O2 process. Furthermore, effects of operating parameters (pH and concentrations of Fe2+ and H2O2) on the degradation of melatonin by Fenton's reagent were investigated, and the degradation of melatonin was more efficient by Fenton's reagent than by UV/H2O2 process. The fastest degradation of melatonin and highest TOC removal was achieved by UV/Fe2+/H2O2 process among the four different processes tested.

Revue / Journal Title

Separation and purification technology    ISSN  1383-5866 

Source / Source

2009, vol. 68, no2, pp. 261-266 [6 page(s) (article)] (32 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1997) (Revue)

Mots-clés anglais / English Keywords

Operating conditions

;

Rate constant

;

pH

;

Kinetics

;

First order

;

Photochemical reactor

;

Batchwise

;

Laboratory scale

;

Photooxidation

;

Fenton reaction

;

Oxidation

;

Aqueous solution

;

Human

;

Production

;

Hydrogen peroxide

;

Ultraviolet radiation

;

Mots-clés français / French Keywords

Condition opératoire

;

Constante vitesse

;

pH

;

Cinétique

;

Ordre 1

;

Réacteur photochimique

;

En discontinu

;

Echelle laboratoire

;

Photooxydation

;

Réaction Fenton

;

Oxydation

;

Solution aqueuse

;

Homme

;

Production

;

Peroxyde d'hydrogène

;

Rayonnement UV

;

Mots-clés espagnols / Spanish Keywords

Condición operatoria

;

Constante velocidad

;

pH

;

Cinética

;

Orden 1

;

Reactor fotoquímico

;

En discontinuo

;

Escala laboratorio

;

Fotooxidación

;

Reacción Fenton

;

Oxidación

;

Solución acuosa

;

Hombre

;

Producción

;

Peróxido de hydrogeno

;

Radiación ultravioleta

;

Mots-clés d'auteur / Author Keywords

Melatonin

;

Degradation

;

Kinetics

;

Advanced oxidation processes

;

Comparison

;

Localisation / Location

35400017084055.0210

Nº notice refdoc (ud4) : 21749199



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