Solvation Cyclic voltammetry Parameters for Na2WO4 In NaClO4 , HCl Media and lnteraction with Congo Red Dye | ||||
| Egyptian Journal of Chemistry | ||||
| Volume 68, Issue 7, July 2025, Page 387-395 PDF (1.4 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2024.322483.10483 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ghada M.Z. El-Sayed 1, 2; Safa Q. Hussein1; Esam A. Gomaa 1; Mahmoud N. Abd El-Hady  1; Nermeen M. Hassan1
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| 1Chemistry Department, Faculty of Science, Mansoura University, Egypt. | ||||
| 2Higher Future Institute of Engineering and Technology,Mansoura,Egypt. | ||||
| Abstract | ||||
| The study examined the effects of different concentrations of sodium tungstate (Na₂WO₄) using cyclic voltammetry with a glassy carbon electrode (EGC). In acidic HCl and neutral NaClO₄ media, the cathodic reaction of sodium tungstate was characterized by the transfer of tungstate ions to WO₂. Additionally, the oxidation of WO₂ ions to WO₃ was observed. Cyclic voltammetry parameters for sodium tungstate in the absence and presence of Congo red dye were analyzed in both NaClO₄ and HCl media. The stability constants and Gibbs free energies of complexation were estimated for both media, revealing higher values in NaClO₄ compared to HCl. This suggests that the complexation reaction between Na₂WO₄ and Congo red dye is more favorable in NaClO₄ than in HCl. Furthermore, the kinetic and solvation parameters for the interaction of Na₂WO₄ with Congo red in 0.1 M NaClO₄ were lower than those observed in 0.1 M HCl, attributed to a faster electron transfer rate in the HCl medium. | ||||
| Keywords | ||||
| Cyclic voltammetry; Na2WO4; Congo Red | ||||
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