Behavior of gold nanoparticles in a titania aerogel matrix: Photocatalytic activity assessment and structure investigations

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• 作者：Zsolt PAP^a ; Andreea RADU^b ; Izabella Jolan HIDI^b ; Georgian MELINTE^b ; Lucian DIAMANDESCU^c ; Traian POPESCU^c ; Lucian BAIA^b ; ^d ; Virginia DANCIU^a ; Monica BAIA^b ; ^d ; ^{monica.baia@phys.ubbcluj.ro}
• 关键词：Nanomaterial ; Sol-gel ; Titania ; Salicylic acid ; Photocatalytic performance
• 刊名：Chinese Journal of Catalysis
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：34
• 期：4
• 页码：734-740
• 全文大小：1338 K

文摘

TiO₂-Au aerogels containing different amounts of gold nanoparticles of different sizes (5 and 16 nm) were successfully synthesized using a sol-gel procedure, and were tested for salicylic acid photodegradation under UV irradiation. The structure and morphology of the obtained materials were investigated using X-ray diffraction, transmission electron microscopy, and N₂ adsorption-desorption measurements. UV-Vis spectroscopy was used to study the optical properties. The effects of the gold nanoparticles on the TiO₂ crystallization process were twofold, as follows: (i) the number of crystallized zones was strongly related to the concentration of the gold nanoparticles, and (ii) the smaller gold particles increased the time taken for the crystallization of the samples. It was found that the noble metal-doped samples exhibited higher degradation rates compared with bare titania. It was found that the most active photocatalyst in each studied system was the sample with the highest concentration of gold nanoparticles. Additionally, the highest degradation rate value was obtained with the smallest Au nanoparticles (46.4 ¡Á 10^?3 ¦Ìmol/(L¡¤s).