Chromium ions in the solution were electro-oxidized using a novel carbon paste electrode containing Cr_(2)O_(3) nanoparticles.As a result of the modification,the voltammetric response of Cr-ion could be resolved into ...Chromium ions in the solution were electro-oxidized using a novel carbon paste electrode containing Cr_(2)O_(3) nanoparticles.As a result of the modification,the voltammetric response of Cr-ion could be resolved into one well-defined peak.As a result,the quest-reversible mechanism was activated.Researchers investigated the electrode’s kinetics between 20 and 30 degrees Celsius.In the redox process of Cr-ion oxidation,the voltammogram data indicated a rise in temperature that increased negative shift,which implied diffusion electron transfer.The Randles-Sevcik equation gave a diffusion coefficient of 1.9×10^(-3);the rate constant K was 0.3×10^(-3);and According to the study,In the range of 2-10 ppm,the peak current of Cr-ion rose linearly with its concentration,thermodynamic and kinetic parameters was calculated such as ΔE,ΔH,ΔG andΔS equal to-58.2,-4.9,-65.1 and 0.11 KJ/mol respectively.展开更多
文摘Chromium ions in the solution were electro-oxidized using a novel carbon paste electrode containing Cr_(2)O_(3) nanoparticles.As a result of the modification,the voltammetric response of Cr-ion could be resolved into one well-defined peak.As a result,the quest-reversible mechanism was activated.Researchers investigated the electrode’s kinetics between 20 and 30 degrees Celsius.In the redox process of Cr-ion oxidation,the voltammogram data indicated a rise in temperature that increased negative shift,which implied diffusion electron transfer.The Randles-Sevcik equation gave a diffusion coefficient of 1.9×10^(-3);the rate constant K was 0.3×10^(-3);and According to the study,In the range of 2-10 ppm,the peak current of Cr-ion rose linearly with its concentration,thermodynamic and kinetic parameters was calculated such as ΔE,ΔH,ΔG andΔS equal to-58.2,-4.9,-65.1 and 0.11 KJ/mol respectively.
