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Low-temperature route to metal titanate perovskite nanoparticles for photocatalytic applications

Paper ID Volume ID Publish Year Pages File Format Full-Text
44939 46386 2015 9 PDF Available
Title
Low-temperature route to metal titanate perovskite nanoparticles for photocatalytic applications
Abstract

•Sonochemical route successful for low-temperature synthesis of titanates.•Presence of ionic liquid supports formation of cubic phase under mild conditions.•High photocatalytic activities observed for the titanates without calcination step.•The presence of different phases improves photocatalytic hydrogen production.•Nitrogen-doped SrTiO3 shows a shifted band edge and visible light activity.

MTiO3 (M = Ca, Sr, Ba) nanoparticles were synthesized by a one-step room-temperature ultrasound synthesis in ionic liquid. The obtained samples are characterized by X-ray diffraction, scanning electron microscopy, nitrogen adsorption, UV–vis diffuse reflectance, Raman and IR spectroscopy and their capability in photocatalytic hydrogen evolution and methylene blue degradation was tested. Powder X-ray diffraction and Raman spectroscopic investigations revealed the products to crystallize in the cubic perovskite structure. SEM observations showed that the obtained CaTiO3 consists of nanospheres, BaTiO3 of raspberry-like shaped particles of 20 nm in diameter. SrTiO3 particles have cubic-like morphology with an edge length varying from 100 to 300 nm. SrTiO3 exhibited the highest catalytic activity for photocatalytic H2 evolution using only 0.025 wt.% Rh as co-catalyst and for the degradation of methylene blue under UV irradiation. The influence of parameters such as synthesis method, calcination temperature, and doping with nitrogen on the morphology, crystallinity, chemical composition, and photocatalytic acivity of SrTiO3 was studied. Heating the as-prepared SrTiO3 to 700 °C for extended time leads to a decrease in surface area and catalytic activity. Ionothermal prepared SrTiO3 exhibits a higher activity than sonochemically prepared one without co-catalyst due to a synergistic effect of anatase which is present in small amount as a by-phase. After photodeposition of Rh, however, the activity is lower than that of the sonochemically prepared SrTiO3. Nitrogen-doped SrTiO3 showed photocatalytic acivity under visible light irradiation.

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Keywords
Titanates; Sonochemical synthesis; Photocatalysis; Hydrogen formation; Nitrogen doping
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Low-temperature route to metal titanate perovskite nanoparticles for photocatalytic applications
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 178, November 2015, Pages 20–28
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