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Influence of radiation and TiO2 concentration on the hydroxyl radicals generation in a photocatalytic LED reactor. Application to dodecylbenzenesulfonate degradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
44955 46386 2015 5 PDF Available
Title
Influence of radiation and TiO2 concentration on the hydroxyl radicals generation in a photocatalytic LED reactor. Application to dodecylbenzenesulfonate degradation
Abstract

•Photocatalytic degradation of DBS in UV-LED reactor.•Determination of OH generation rate.•Modelling DBS degradation rate as function of OH generation.

One of the main issues associated to the development of photocatalysis is the lack of adequate indexes that allow the comparison of the results obtained in different experimental setup designs. The hydroxyl radicals (OH) generation rate is a key factor to determine the overall oxidation rate.In this work, using a Light Emitting Diodes (LEDs) reactor aimed to maximize light efficiency and minimize energy consumption, the OH generated have been determined as a function of the radiation and catalyst concentration following an indirect method based on the reaction between OH and dimethyl sulfoxide (DMSO) to produce formaldehyde.Finally, the methodology has been applied to analyze the degradation kinetics of the anionic surfactant dodecylbenzenesulfonate (DBS), frequently used in shampoo formulations and detergents for washing machines. We propose a method based on the indirect determination of OH radicals generation rate that allows the assessment and comparison of the kinetics of photocatalytic oxidation of pollutants.

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Keywords
DBS; Hydroxyl radicals; Light emitting diode; Photocatalysis; Kinetic modeling
First Page Preview
Influence of radiation and TiO2 concentration on the hydroxyl radicals generation in a photocatalytic LED reactor. Application to dodecylbenzenesulfonate degradation
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 178, November 2015, Pages 165–169
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis