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Photoelectrocatalytic technologies for environmental applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
28164 44062 2012 12 PDF Available
Title
Photoelectrocatalytic technologies for environmental applications
Abstract

This paper summarizes recent research works dealing with the development of photoelectrocatalytic oxidation technologies combining both electrolytic and photocatalytic processes. Photoelectrocatalytic technologies have received particular attention due to their potential and effectiveness in the photodegradation of refractory organic and microbial pollutants present in water and wastewater. Here, titanium dioxide (TiO2) plays the most important role compared to other semiconductor photocatalysts (CdS, ZnO, SnO2, etc.) due to its excellent chemical and physical properties. The recombination of the photogenerated electrons and holes is the main factor that generally limits the application of photocatalytic processes (PCPs) in the environmental field. Considerable efforts have been made to increase the photocatalytic efficiency and decrease the charge recombination by means of photoelectrocatalytic processes (PECPs), also referred to as electrochemically assisted photocatalytic processes, which consists of applying an external potential on photocatalysts. This paper deals with the mechanism of photoelectrocatalytic processes, the characteristics and methods for preparing a TiO2 electrode, the irradiation sources, and the types of reactors used. Moreover, the key factors affecting the photoelectrocatalytic oxidation efficiency are discussed, including the applied electrical potential, light intensity, pH, dissolved oxygen concentration, electrolyte concentration, and temperature. Finally, the paper emphasizes the recent applications of photoelectrocatalytic processes and suggests new research directions for the development of this promising technology.

► Photoelectrocatalytic technologies combine both electrolytic and photocatalytic processes. ► It retards the recombination of the electron–hole pairs (e−CB/h+VB). ► PECPs are alternative methods for refractory organic pollutant removal. ► TOC removal of 100% can be reached dependently on the type of organic compounds. ► PECPs can be advantageously combined with biological process.

Keywords
AOPs, advanced oxidation processes; CB, conduction band; COD, chemical oxygen demand; CTC, chlortetracycline hydrochloride; DP, direct photolysis; EAOPs, electrochemical advanced oxidation processes; E. coli, Escherichia coli; EO, electrochemical oxidatio
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 238, 15 June 2012, Pages 41–52
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us