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<p>A voltammetric facile sensor based on ZIF-7 and calcined sodium alginate (SA) was investigated for Rho B detection. The porous carbon derived by calcination of SA at 700&#xa0;°C, significantly modified the surface chemistry and synergistic interactions including π–π stacking, hydrogen bonding, and electrostatic attraction which strengthen the binding ability between Rho B and the carbon lattice and oxygen-rich surface of SA. Similarly, the nanostructured ZIF-7 remarkably enhanced the electroactive surface area and more active sites for Rho B accommodation. Hence, the composite overall improved the electrochemical behaviors. The SEM study clearly supports the porous behavior of SA on thermal treatment and structural integrity of the composite. The electrochemical studies exhibit high electrical conductivity and excellent catalytic activity towards the Rho B sensing. As a result of porous SA, architecture decorated with ZIF-7 composite enabled the Rho B detection over a wide range of 90–400&#xa0;nM with a LOD of 27&#xa0;nM. The biocompatible SA demonstrated selective sensing of Rho B, exhibiting strong anti-interferent ability in the presence of common interferents. Finally, the proposed material was fruitfully explained for real-time detection of Rho B in chili powder and tomato sauce, signifying its practicality for reliable analytical device in food safety applications. The highlight of the work is ecofriendly SA-700 carbonized porous network combined with ZIF-7 nanocrystals, demonstrating excellent adsorption of Rho B by enhanced electron transfer and good electrocatalytic activity. Besides, the sensor showed excellent reproducibility and stability, promoting its possibility for environmental applications.</p> Graphical Abstract <p></p>

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ZIF-7@sodium alginate–derived porous carbon: a sustainable and efficient material for ultrasensitive monitoring of Rhodamine B

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • P. Satheesh Kumar,
  • S. Kiruthika,
  • P. Sakthivel,
  • V. Vasudevan,
  • K. Ramachandran,
  • Wilson Jeyaraj

摘要

A voltammetric facile sensor based on ZIF-7 and calcined sodium alginate (SA) was investigated for Rho B detection. The porous carbon derived by calcination of SA at 700 °C, significantly modified the surface chemistry and synergistic interactions including π–π stacking, hydrogen bonding, and electrostatic attraction which strengthen the binding ability between Rho B and the carbon lattice and oxygen-rich surface of SA. Similarly, the nanostructured ZIF-7 remarkably enhanced the electroactive surface area and more active sites for Rho B accommodation. Hence, the composite overall improved the electrochemical behaviors. The SEM study clearly supports the porous behavior of SA on thermal treatment and structural integrity of the composite. The electrochemical studies exhibit high electrical conductivity and excellent catalytic activity towards the Rho B sensing. As a result of porous SA, architecture decorated with ZIF-7 composite enabled the Rho B detection over a wide range of 90–400 nM with a LOD of 27 nM. The biocompatible SA demonstrated selective sensing of Rho B, exhibiting strong anti-interferent ability in the presence of common interferents. Finally, the proposed material was fruitfully explained for real-time detection of Rho B in chili powder and tomato sauce, signifying its practicality for reliable analytical device in food safety applications. The highlight of the work is ecofriendly SA-700 carbonized porous network combined with ZIF-7 nanocrystals, demonstrating excellent adsorption of Rho B by enhanced electron transfer and good electrocatalytic activity. Besides, the sensor showed excellent reproducibility and stability, promoting its possibility for environmental applications.

Graphical Abstract