fulltext.study @t Gmail

Gold nanoparticles supported on cerium(IV) oxide powder for mineralization of organic acids in aqueous suspensions under irradiation of visible light of λ = 530 nm

Paper ID Volume ID Publish Year Pages File Format Full-Text
41712 45897 2011 6 PDF Available
Title
Gold nanoparticles supported on cerium(IV) oxide powder for mineralization of organic acids in aqueous suspensions under irradiation of visible light of λ = 530 nm
Abstract

Gold (Au) nanoparticles supported on cerium(IV) oxide (CeO2) were prepared by the photodeposition method. These samples showed strong absorption at around 550 nm due to localized surface plasmon resonance (LSPR) of Au. These Au/CeO2 samples were used for mineralization of organic acids (formic acid, oxalic acid and acetic acid) in the aqueous suspensions under irradiation of visible light (>ca. 520 nm) and three acids were stoichiometrically decomposed to carbon dioxide. Apparent activation energy for mineralization of formic acid was very small (2.4 kJ mol−1) compared with those by thermocatalytic reactions, and the action spectrum was in good agreement with the photoabsorption spectrum, indicating that the rate-determining step in mineralization of organic acids in the irradiated Au/CeO2 system was different from the thermal activation process and that this mineralization involved a photoinduced step by LSPR of Au supported on CeO2. When a green light-emitting diode (center wavelength = 530 nm) was used as the light source of visible light, mineralization of formic acid also occurred. Apparent quantum efficiency of formic acid mineralization increased with decrease in the intensity of the green light and reached 4.7% at 0.4 mW cm−2.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (144 K)Download as PowerPoint slideResearch highlights► Gold (Au)/cerium oxide (CeO2) samples were prepared by the photodeposition method. ► Au/CeO2 showed absorption at ca. 550 nm due to surface plasmon resonance of Au. ► Formic acid, oxalic acid and acetic acid were stoichiometrically decomposed to CO2. ► A green light-emitting diode (λ = 530 nm) can be used as the light source. ► Apparent quantum efficiency of formic acid mineralization reached 4.7%.

Keywords
Photocatalyst; Gold nanoparticles; Cerium(IV) oxide; Mineralization of organic acids; Visible light; Localized surface plasmon resonance
First Page Preview
Gold nanoparticles supported on cerium(IV) oxide powder for mineralization of organic acids in aqueous suspensions under irradiation of visible light of λ = 530 nm
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 397, Issues 1–2, 30 April 2011, Pages 121–126
Authors
, , ,
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