4.6 Article

Ultrasensitive electrochemical determination of phosphate in water by using hydrophilic TiO2 modified glassy carbon electrodes

Journal

ANALYTICAL METHODS
Volume 13, Issue 8, Pages 996-1002

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ay01854f

Keywords

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Funding

  1. National Key Research and Development Program of China [2017YFA0205303]
  2. National Natural Science Foundation of China [61804158]
  3. Chenguang Scholar of Shanghai Municipal Education Commission [18CG67]
  4. Shanghai Sailing Program [18YF1428300, 18YF1422500]
  5. Research start-up project of Shanghai Institute of Technology [YJ2017-8]

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An ultrasensitive electrochemical determination of phosphate in water was achieved using hydrophilic TiO2 modified glassy carbon electrodes for the first time, with a detection limit of 0.1 μg L-1 and a linear relationship between phosphate concentration and peak current.
In this paper, ultrasensitive electrochemical determination of phosphate in water is achieved by using hydrophilic TiO2 modified glassy carbon electrodes for the first time. The differential pulse voltammetry (DPV) method is proposed to measure phosphate in water as pulse techniques offer higher sensitivity compared with the conventional cyclic voltammetry (CV) method. Hydrophilic TiO2 films were obtained upon ultraviolet (UV) illumination after TiO2 precursor emulsions were coated on the surfaces of glassy carbon electrodes, and used for phosphate determination. Contact angle measurements (around 23.4 degrees) proved the good hydrophilicity of the TiO2 modified surface upon UV illumination. A detection limit of 0.1 mu g L-1 is obtained, and a linear relationship (R-2 = 0.99) between the phosphate concentration (ranging from 0.1 mu g L-1 to 1 mu g L-1) and the peak current was observed.

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