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Reduced graphene oxide and PbS nanoparticles co-modified TiO2 nanotube arrays as a recyclable and stable photocatalyst for efficient degradation of pentachlorophenol

Paper ID Volume ID Publish Year Pages File Format Full-Text
40432 45853 2013 7 PDF Available
Title
Reduced graphene oxide and PbS nanoparticles co-modified TiO2 nanotube arrays as a recyclable and stable photocatalyst for efficient degradation of pentachlorophenol
Abstract

•One-step electrodeposition method to prepare RGO/PbS-TiO2 NTs is simple and green.•A heterogeneous, stable and eco-friendly reusable photocatalyst is utilized.•The ternary photocatalyst enhances photoinduced charges separation.•The photocatalyst displays almost 100% photocatalytic removal of PCP.

TiO2 nanotube arrays (TiO2 NTs) were simultaneously modified by reduced graphene oxide (RGO) and PbS nonoparticles (NPs) through a simple one-step electrodeposition process. RGO film is formed on the top surface of TiO2 NTs and PbS NPs showing size less than 20 nm are intercalated within the RGO sheets and also dispersed inside/outside walls the TiO2 NTs. Resulting from the synergetic effect of RGO and PbS, the photocatalytic activity of the ternary RGO/PbS-TiO2 NTs photocatalyst far exceeds those of bare TiO2 NTs, the binary RGO-TiO2 NTs and PbS-TiO2 NTs photocatalysts in the degradation of pentachlorophenol (PCP) under simulated solar light. After 120-min irradiation, almost 100% PCP removal is obtained on the RGO/PbS-TiO2 NTs, compared to 61% on bare TiO2 NTs, 76% on RGO-TiO2 NTs, and 86% on PbS-TiO2 NTs. Because the PbS NPs were covered by the RGO sheets, to a certain extent the photocorrosion of PbS was suppressed, and therefore the RGO/PbS-TiO2 NTs photocatalyst shows a good stability relative to the PbS-TiO2 NTs without RGO. This study will inspire better design of advanced photocatalysts with high visible-light photocatalytic activity, easy recovery, and good stability.

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Keywords
TiO2 nanotube; Reduced graphene oxide; PbS; Photocatalysis; Pentachlorophenol
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Reduced graphene oxide and PbS nanoparticles co-modified TiO2 nanotube arrays as a recyclable and stable photocatalyst for efficient degradation of pentachlorophenol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 457, 24 April 2013, Pages 78–84
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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