Photocatalytic Reactors Dedicated to the Degradation of Hazardous Organic Pollutants: Kinetics, Mechanistic Aspects, and Design – A Review
Résumé
In recent years, heterogeneous photocatalysis has emerged as a new effective, powerful, clean, and safe decontamination technology for the treatment of organic pollutants and the transformation of hazardous chemicals into different forms. This review focuses on the recent development of various conventional technologies of reactors designated for the photodegradation of hazardous organic pollutants with their limitations. This phenomenon is strongly influenced by reaction conditions such as temperature of reaction, pH, light intensity and wavelength, pollutant concentration, photocatalyst quantity, relative humidity (RH), and other parameters. The catalyst photoactivity depends on the structural characteristics of the semiconductor, its morphology, and its particles size. This paper presents the progression of photocatalytic reactors for synthetic dyes degradation with special consideration to the use of supported photocatalyst and nanostructured titanium supported over volcanic ashes, owing to the major advantage of an easy separation of the catalyst when compared to homogenous system, namely suspended catalyst. In addition, special attention was paid to the literature dealing with the promotion of light efficiency by testing various light sources. © 2016, Copyright © Taylor & Francis Group, LLC.
Mots clés
Catalysis
Catalysts
Chemical warfare
Hazards
Light sources
Organic chemicals
Photocatalysis
Pollution
Volcanoes
Water pollution
Water treatment
Heterogeneous photocatalysis
Nanostructured titanium
Photocatalytic reactors
Photoreactors
Pollutant concentration
Structural characteristics
Supported photocatalyst
Synthetic dyes
Organic pollutants