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Passivated n–p co-doping of niobium and nitrogen into self-organized TiO2 nanotube arrays for enhanced visible light photocatalytic performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
45369 46410 2014 10 PDF Available
Title
Passivated n–p co-doping of niobium and nitrogen into self-organized TiO2 nanotube arrays for enhanced visible light photocatalytic performance
Abstract

•Passivated n–p co-doping of niobium and nitrogen into TiO2 nanotube arrays.•Anodization of Ti–Nb alloys for Nb dopant incorporation and uniform distribution.•Nb doping was found to promote the subsequent N doping into the anatase lattice.•Largely enhanced visible light response from Nb/N co-doping.•Largely enhanced visible light photocatalytic degradation of MB from Nb/N co-doping.

Passivated n–p co-doping of niobium and nitrogen was successfully incorporated into self-organized TiO2 nanotube arrays by anodizing Ti–Nb alloys, followed with the heat treatment in a flow of ammonia gas. Nb was doped into TiO2 nanotube arrays during the anodization by substituting Ti4+ with Nb5+, while N was doped into TiO2 nanotube arrays during the heat treatment by substituting O2− with N3−. Since Nb in TiO2 enhanced the adsorption of NH3 molecules onto the nanotube arrays, Nb doping was found to promote the subsequent N doping into the anatase lattice. As predicted by first-principles band structure calculations, Nb/N co-doped titanium oxide nanotube arrays demonstrated a largely enhanced visible light response and visible light photocatalytic performance on the degradation of methylene blue, compared to TiO2 nanotube arrays or TiO2 nanotube arrays with either dopant. The passivated n–p co-doping approach may also be applied to other material systems and promise a wide range of technical applications.

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Keywords
Passivated n–p co-doping; Niobium; Nitrogen; TiO2 nanotube arrays; Enhanced visible light photocatalytic performance
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Passivated n–p co-doping of niobium and nitrogen into self-organized TiO2 nanotube arrays for enhanced visible light photocatalytic performance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 343–352
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