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Related Experiment Video

Updated: Jun 25, 2026

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition

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Photoelectrocatalytic COD determination method using highly ordered TiO(2) nanotube array.

Jialing Zhang1, Baoxue Zhou, Qing Zheng

  • 1School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Water Research
|March 10, 2009
PubMed
Summary

This study presents a rapid photoelectrocatalytic method for chemical oxygen demand (COD) determination using titanium dioxide (TiO2) nanotube arrays. The new method offers a faster, greener alternative to traditional techniques, with high accuracy and a wide working range.

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Chemical oxygen demand (COD) is a critical water quality parameter.
  • Traditional COD determination methods, like the K2Cr2O7 method, are time-consuming and generate hazardous waste.
  • There is a need for faster, more environmentally friendly COD analysis techniques.

Purpose of the Study:

  • To develop and optimize a photoelectrocatalytic method for COD determination.
  • To utilize a highly effective TiO2 nanotube array electrode in a thin-cell reactor.
  • To evaluate the performance and applicability of the developed method for real-world water samples.

Main Methods:

  • Experimental studies on TiO2 nanotube array electrode preparation and optimization.

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Last Updated: Jun 25, 2026

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition

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  • Investigation of parameters including electrolyte, anodic potential, time, pH, and calcination conditions.
  • Utilizing a thin-cell photoelectrocatalytic reactor for COD analysis.
  • Comparative analysis with the standard K2Cr2O7 method.

    • Main Results:

    • Optimized TiO2 nanotube array electrode prepared in 1% HF, 20V, 5min, 450°C showed high photoelectrocatalytic performance.
    • The method achieved rapid COD determination (1-5 min) without titration, significantly faster than the standard method.
    • A wide dynamic working range (0-850 mg/L) was established, exceeding other photoelectrocatalytic methods.
    • Real sample analysis demonstrated good agreement with the standard dichromate method, indicating accuracy, stability, and reproducibility.

    Conclusions:

    • The developed photoelectrocatalytic method using TiO2 nanotube arrays is a highly effective and rapid technique for COD determination.
    • This method offers significant advantages over traditional approaches, including speed, reduced environmental impact, and a broad working range.
    • The method shows excellent potential for practical application in water quality monitoring.