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Optimization and Analysis of Ag–TiO2 Nanotube Electrode for the Degradation of Tetracycline

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Ag–TiO2 nanotube electrodes were prepared by Ag doping of TiO2 nanotube electrodes. Modification of the electrodes was confirmed by scanning electron microscopy and X-ray diffraction. The electrodes were subsequently examined in the photoelectrocatalytic degradation of tetracycline (as a measure of total organic content (TOC) removal rate) by three-dimensional fluorescence spectroscopy. Optimization of the photoelectrocatalytic process was theoretically determined. Specifically, using the single-factor test and response surface methods based on central composite design, the influence of bias, initial solution pH, Cl concentration, reaction time, and their interactive effects was determined. A second-order polynomial regression equation was developed to describe the TOC removal rate, which was validated by analysis of variance. The significance of the influential factors decreased in the order of reaction time, Cl concentration, initial pH, and bias potential-the interactive influence between the Cl concentration and reaction time was the most significant. The optimal conditions to generate a predicted TOC removal of 86.72% were determined as bias potential of 3.12 V, initial pH of 3.7, initial Cl concentration of 62.5 mmol/L, and reaction time of 133.2 min. Under these conditions, the actual TOC removal rate was 83.56%, which was highly consistent with the predicted result of the model equation. This finding also shows that the Ag–TiO2 electrode displays excellent photoelectrocatalytic activity.
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Document Type: Research Article

Publication date: August 1, 2017

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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