Electrochemical Reduction Reaction of Potassium Chromate with Orange G and Giemsa Stain Dyes in HCl Solution Using Cyclic Voltammetry and Quantum Chemistry Properties

Document Type : Original Article

Authors

Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt.

Abstract

The cyclic voltammetry of potassium chromate, K2CrO4 was studied in 0.1 mol/L HCl at 291.15 and 299.15 K, respectively, using a glassy carbon electrode. The effects of various scan rates were studied in this medium. Cyclic voltammetry was also done for potassium chromate in the presence of Orange G dye at 291.15K and Giemsa stain dye at 299.15K, and further scan rate effects were discussed. The stability constants and Gibbs free energies of complexation resulting from the interaction of chromate ions with dyes were evaluated and found to be complexation reactions. All the Nicholson parameters for potassium chromate are increased by the increase of orange G or Giemsa Stain dyes concentration indicating the possibility of using this medium as a leaching solution. The molecular Gibbs free energies for potassium chromate are increased by increasing the concentration of the dyes till it reached -62.846 K.J using 2 x10-3 M Orange G dye and -44.951 K.J using 2x10-3 M Giemsa Stain dye, The stability constants and Gibbs free energy of complexation of potassium chromate with dyes are decreased by the decrease of the scan rate till they reached to 3.069 and -17.107 K.J using 2 x10-3 M Orange G dye and 5.056 and -28.961 K.J using 2x10-3 M Giemsa Stain dye for log stability constant and Gibbs free energy of complexation using scan 0.01 V/Sec scan. Molecular docking was also performed for studying the binding modes between Orange G or Giemsa Stain dyes and active sites of the structure of the SARS-CoV-2 N protein (7N0R).

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History

  • Receive Date: 24 October 2022
  • Revise Date: 12 December 2022
  • Accept Date: 18 December 2022

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