Study on Electrochemical Selenium Extraction by Voltammetry on a Glassy Carbon Electrode

Cyclic Voltammetry (CV) was employed to systematically investigate the electrochemical deposition and stripping behavior of selenium dioxide (SeO₂) in a nitric acid medium on a Glassy Carbon Electrode (GCE), aiming to reveal the reaction mechanism of low-cost electrode materials for selenium recovery. A three-electrode system was adopted in the experiment, with GCE as the working electrode, a graphite rod as the counter electrode, and an Ag/AgCl electrode as the reference electrode. Tests were conducted in an electrolyte containing 0.1 M SeO₂ and 0.1 M HNO₃ at scan rates ranging from 2 to 100 mV/s. Results from the scan rate experiment showed that the peak currents of C2 and C3 exhibited a linear relationship with the square root of the scan rate, indicating that the deposition process is diffusion-controlled and self-limiting. This study provides a key theoretical basis for the parameter optimization of low-cost electrochemical selenium extraction technology.