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• W3096988704 endingPage "128847" @default.
• W3096988704 startingPage "128847" @default.
• W3096988704 abstract "Developing photoelectrochemical (PEC) sensors based on photocatalytic materials has recently attracted great interest as an emerging technology for environmental monitoring. TiO2 P25 is a well-known highly active photocatalyst, cheap, and produced commercially on a large scale. In the current work, a practical and durable TiO2-based PEC sensor has been fabricated by immobilizing TiO2 P25 nanoparticles at disposable screen-printed carbon substrates using drop-casting method. The fabricated PEC sensor has been applied for the anodic-detection and determination of nitrite (NO2−) ions under UV(A) light (LED, 365 nm) using chronoamperometry (CA) and differential pulse voltammetry (DPV). Linear calibration curves were obtained between the photocurrent responses and the concentrations of NO2− ions in the ranges of 0.1–5.0 and 0.5–10 mg L−1 for CA and DPV, respectively. Surprisingly, the detection limits (sensitivities) of the fabricated sensor towards NO2− ions under light were enhanced by a factor of 4.75 (4.1) and 8.3 (37.4) for CA and DPV, respectively, in comparsion with those measured in the dark. It is found that the photo-excitation of TiO2 facilitates the photooxidation of NO2− ions via the photo-generated holes whereas the photogenerated electrons contribute to the enhanced photocurrent and consequently the enhanced detection limit and sensitivity. The fabricated TiO2-based PEC sensor exhibits a good stability, durability, and satisfying selectivity for NO2− ions determination. These results indicate that the TiO2-based PEC sensor fabricated by utilizing cheap and commercially available components has great potential for being transferred from lab-to-factory." @default.
• W3096988704 created "2020-11-09" @default.
• W3096988704 creator A5039652047 @default.
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• W3096988704 date "2021-04-01" @default.
• W3096988704 modified "2023-09-26" @default.
• W3096988704 title "New application for TiO2 P25 photocatalyst: A case study of photoelectrochemical sensing of nitrite ions" @default.
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• W3096988704 doi "https://doi.org/10.1016/j.chemosphere.2020.128847" @default.
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