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
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
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DOI：
10.1016/j.apcata.2011.02.029
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发表时间：
2011-04
影响因子：
5.5
通讯作者：
H. Kominami;A. Tanaka;K. Hashimoto
中科院分区：
文献类型：
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作者：
H. Kominami;A. Tanaka;K. Hashimoto
采用光沉积法制备了CeO 2负载金（Au）纳米粒子。由于Au的局域表面等离子体共振（LSPR），这些样品在550 nm附近显示出强吸收。这些Au/CeO 2样品被用于在可见光（>ca.）照射下矿化水悬浮液中的有机酸（甲酸、草酸和乙酸）。520 nm）和三种酸化学计量地分解成二氧化碳。甲酸矿化的表观活化能很小（2.4kJmol−1），作用光谱与光吸收光谱符合良好，这表明，在辐照Au/CeO 2系统是不同的热活化过程，这种矿化涉及的LSPR的Au负载在CeO 2上的光诱导步骤。当使用绿色发光二极管（中心波长= 530 nm）作为可见光光源时，也发生甲酸的矿化。甲酸矿化的表观量子效率随着绿色光强度的降低而增加，在0.4 mWcm −2时达到4.7%。
Gold (Au) nanoparticles supported on cerium(IV) oxide (CeO2) were prepared by the photodeposition method. These samples showed strong absorption at around 550nm due to localized surface plasmon resonance (LSPR) of Au. These Au/CeO2samples were used for mineralization of organic acids (formic acid, oxalic acid and acetic acid) in the aqueous suspensions under irradiation of visible light (>ca. 520nm) and three acids were stoichiometrically decomposed to carbon dioxide. Apparent activation energy for mineralization of formic acid was very small (2.4kJmol−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/CeO2system 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=530nm) 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 0.4mWcm−2.