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Cu2S/TiO2 heterojunction applied to visible light Orange II degradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
27979 44054 2012 9 PDF Available
Title
Cu2S/TiO2 heterojunction applied to visible light Orange II degradation
Abstract

We report on the study of some physical properties of Cu2S and their effects toward the photoactivity of the Cu2S/TiO2 heterojunction. Transport properties of Cu2S, i.e. thermoelectric power and electrical conductivity were studied and correlated to the photoelectrochemical characterization to establish the energetic diagram of the Cu2S/TiO2 heterosystem. Corrosion tests of Cu2S and Cu2S/TiO2 electrodes were carried out by plotting the polarization curves in Orange II solution in the dark and under illumination to simulate the photoactive environment. We evaluate the performance of Cu2S and Cu2S/TiO2 by determining the fill factor and the energy conversion efficiency. Electrical Impedance Spectroscopy (EIS) is used for investigation of charge carrier dynamics in these photocatalytic devices. The valence and the conduction bands were estimated to be respectively of −0.3 and of −1.5 V, which enable electron injection from activated Cu2S to an activated TiO2. The p-Cu2S/n-TiO2 is optimized by its application to Orange II degradation under visible light. The best configuration “Cu2S(60%)/TiO2” shows its maximum degradation rate (Rinitial = 9 × 10−2 mg l−1 min−1) at 15 mg l−1 of Orange II (pH ∼ 6.8). The ideal irradiation intensity is estimated to be 18.88 × 10−6 kW which results in an electrical energy consumption per order of magnitude (EE/O) of 20.95 kW h m−3.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The new heterojonction Cu2S/TiO2 is applied to Orange II degradation. ► The physical properties of Cu2S are correlated to the photosensitization effect. ► Cu2S amount, Orange II initial concentration and initial pH are optimized. ► Cu2S/TiO2 shows electrical energy consumption EE/O of 20.95 kW h m−3.

Keywords
p-Cu2S/n-TiO2 heterojunction; Electrochemical Impedance Spectroscopy (EIS) Visible light; Degradation; EE/O
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Cu2S/TiO2 heterojunction applied to visible light Orange II degradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 248, 15 November 2012, Pages 15–23
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
Online Support
Any Questions? feel free to contact us