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Outstanding performance of p-Nitrophenol detection in alkaline solution by Bi2O3@Ru-TiO2 nanotube array composite
Yaya Liu1, Mengyao Yang1, Kai Lin1
1School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.
Abstract:
In this study, Ru-doped TiO2 nanotube arrays (Ru-TNA) were prepared by anodizing RuTi alloy sheets. Subsequently, Bi2O3@Ru-TNA composite electrodes were fabricated by depositing Bi2O3 onto the Ru-TNA using the vacuum impregnation-precipitation method. The electrode was used for the electrochemical detection of p-nitrophenol (p-NP) in a 0.5 M NaOH aqueous solution. The effects of Ru content and Bi2O3 deposition quantity on the detection performance were systematically investigated and performance comparison was conducted between TNA, Ru-TNA, Bi2O3@TNA and Bi2O3@Ru-TNA. The results demonstrate that different from common p-NP detection under neutral and acidic conditions, the Bi2O3@Ru-TNA electrode exhibits superior detection performance for p-NP in alkaline solution, with a linear range of 5-16000 μM, a sensitivity of 1.656 μA/μM·cm2, and a detection limit of 0.029 μM. Moreover, the electrode shows excellent selectivity, stability and high practical applicability.
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