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Synthesis of La-doped Ag1.4K0.6Ta4O11 nanocomposites as efficient photocatalysts for hydrogen production and organic pollutants degradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
40066 45843 2013 7 PDF Available
Title
Synthesis of La-doped Ag1.4K0.6Ta4O11 nanocomposites as efficient photocatalysts for hydrogen production and organic pollutants degradation
Abstract

•A new silver tantalate photocatalyst, Ag1.4K0.6Ta4O11, has been synthesized.•The Ag nanoparticles on the surface enhance absorption in the visible region.•The photocatalytic activity of this material is also enhanced by doping with a few % of La3+.•The photocatalytic activity of La-Ag1.4K0.6Ta4O11 is higher than that of P25 TiO2.

A new silver tantalate material has been synthezied by heating a mixture of AgNO3, Ta2O5 and KCl at 850 °C for 20 h. XRD, EDX, XPS, SEM, TEM and HRTEM show that the material consists of Ag1.4K0.6Ta4O11 nanoplates, with Ag nanoparticles present on the surface, which is consistent with enhanced absorption of the material in the visible region. Addition of 0.5–5 mol% of La2O3 in the preparation of Ag1.4K0.6Ta4O11 results in significant change in the morphology from nanoplates to nanoplates/nanowire composites. The photocatalytic activities of Ag1.4K0.6Ta4O11 and La-Ag1.4K0.6Ta4O11 have been evaluated by degradation of the organic pollutants rhodamine B (RhB) and pentachlorophenol (PCP) in water under visible light (λ > 420 nm), as well as by photocatalytic reduction of water to H2 at λ > 390 nm. The photocatalytic activity of Ag1.4K0.6Ta4O11 is significantly enhanced by La-doping; the optimal La content is 1 mol% for degradation of organic substrates and 5 mol% for H2 evolution, with photocatalytic activity significantly higher than that of P25 TiO2. The enhancement of photocatalytic activity upon La doping is attributed to trapping of excited electrons by La3+, and the formation of nanowires which further promote charge separation.

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Keywords
Tantalum oxide; Lathanum doping; Photodegradation; Organic pollutants; Hydrogen generation
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Synthesis of La-doped Ag1.4K0.6Ta4O11 nanocomposites as efficient photocatalysts for hydrogen production and organic pollutants degradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 467, 2 October 2013, Pages 335–341
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