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<p>Mixed metal vanadates, such as Zn<sub>2</sub>V<sub>2</sub>O<sub>7</sub> prepared via a wet chemical route, have shown great electrochemical biosensing potential owing to their distinctive electronic structure, redox behavior, and catalytic activity. The efficacy of the composite towards ascorbic acid determination was investigated under cyclic voltammetry and differential pulse voltammetry across varied pH conditions: 0.1&#xa0;M H<sub>2</sub>SO<sub>4</sub> (acidic), phosphate-buffered saline (PBS, neutral), and 0.1&#xa0;M KOH (alkaline). In the tested compositions, the Zn<sub>2</sub>V<sub>2</sub>O<sub>7</sub>/g-C<sub>3</sub>N<sub>4</sub> composite ZVOCN75 (0.75&#xa0;g&#xa0;g-C<sub>3</sub>N<sub>4</sub>) exhibited the best performance in PBS. It showed high linearity (<i>R</i><sup>2</sup> = 0.998), a low detection limit of 37&#xa0;µM, and quantification limit of 112.1&#xa0;µM. Although the highest anodic current (<i>I</i><sub>P</sub>) was observed in H<sub>2</sub>SO<sub>4</sub>, stability was poor. KOH provided greater stability and regression than H<sub>2</sub>SO<sub>4</sub> but was outperformed by PBS, which produced maximum analyte and material stability in addition to improved sensitivity. The sensing mechanism was established as diffusion-controlled. Moreover, spiked sample analysis was assessed using tomato and ginger juices in PBS electrolyte. All these findings support Zn<sub>2</sub>V<sub>2</sub>O<sub>7</sub>/g-C<sub>3</sub>N<sub>4</sub> composites, most notably ZVOCN75, in PBS as a sensitive and efficient material for electrochemical biosensing.</p> Graphical Abstract <p></p>

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Tailored g-C3N4/Zn2V2O7 Composite for Superior Electrochemical Sensing of Ascorbic Acid Across Acidic, Neutral and Alkaline Media

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Tahmina Maqsood,
  • Muhammad Danish Khan,
  • Iqra Fareed,
  • Rashid Ahmed,
  • Zulfiqar Ali,
  • Yayha Sandali,
  • Afrah Alzahrani,
  • Mashal Firdous,
  • Anwaar Ahmad,
  • Masood Ul Hassan Farooq,
  • Faheem K. Butt

摘要

Mixed metal vanadates, such as Zn2V2O7 prepared via a wet chemical route, have shown great electrochemical biosensing potential owing to their distinctive electronic structure, redox behavior, and catalytic activity. The efficacy of the composite towards ascorbic acid determination was investigated under cyclic voltammetry and differential pulse voltammetry across varied pH conditions: 0.1 M H2SO4 (acidic), phosphate-buffered saline (PBS, neutral), and 0.1 M KOH (alkaline). In the tested compositions, the Zn2V2O7/g-C3N4 composite ZVOCN75 (0.75 g g-C3N4) exhibited the best performance in PBS. It showed high linearity (R2 = 0.998), a low detection limit of 37 µM, and quantification limit of 112.1 µM. Although the highest anodic current (IP) was observed in H2SO4, stability was poor. KOH provided greater stability and regression than H2SO4 but was outperformed by PBS, which produced maximum analyte and material stability in addition to improved sensitivity. The sensing mechanism was established as diffusion-controlled. Moreover, spiked sample analysis was assessed using tomato and ginger juices in PBS electrolyte. All these findings support Zn2V2O7/g-C3N4 composites, most notably ZVOCN75, in PBS as a sensitive and efficient material for electrochemical biosensing.

Graphical Abstract