Polycyclic Aromatic Hydrocarbon Detection by Electrochemiluminescence Generating Ag/TiO2 Nanotubes

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• 作者：Juanxiu Li ; Lixia Yang ; Shenglian Luo ; Beibei Chen ; Jie Li ; Hailan Lin ; Qingyun Cai ; Shouzhuo Yao
• 刊名：Analytical Chemistry
• 出版年：2010
• 出版时间：September 1, 2010
• 年：2010
• 卷：82
• 期：17
• 页码：7357-7361
• 全文大小：233K
• 年卷期：v.82,no.17(September 1, 2010)
• ISSN：1520-6882

文摘

Highly ordered TiO₂ nanotube arrays are with unique photoelectrical properties due to their highly ordered nanostructure and the resulted short charge transportation path. We report, for the first time, on the application of Ag nanoparticle-modified TiO₂ nanotubes (Ag/TiO₂ NTs) in the electrochemiluminescence detection of polycyclic aromatic hydrocarbons (PAHs) using the Ag/TiO₂ NT film as working electrode and S₂O₈²⁻ as coreactant, with benzo(a)pyrene (BaP) as the model compound. The hydrophobic BaP absorbs onto the TiO₂ NTs surface, and oxidized with consumption of the excited TiO₂ (TiO₂^*+) resulting in a decrease in ECL. Under the optimal conditions, a detection limit of 1.0 × 10⁻¹² M is achieved with a linear range of 3.0 × 10⁻¹² 1.0 × 10⁻⁹ M. Compounds which can not be oxidized by the excited TiO₂ (TiO₂^*+), such as benzene, naphthalene (NAP), anthracene (ANT), and tris-2,3-dibrominepropyl isocyanurate (TBC) show little interference on the detection, whereas PAHs with more than four rings can be detected by the proposed method.