关键词: 金刚石薄膜电极, 亚甲基蓝, 影响因素, 反应动力学模拟

Abstract: Herein, the simulated methylene blue dye wastewater was treated by boron-doped diamond film electrode group. Film quality and effects of initial concentration of methylene blue, solution pH, electrolyte dosage, and applied current density on the removal of boron-doped diamond film were investigated, and reaction kinetics simulation was conducted. Results show that the removal rate constant, removal rate of methylene blue, and solution COD removal rate increased with an increase in the pH, electrolyte, and current density. When the initial pH increased from 4 to 10, the methylene blue removal rate constant increased from 0.001 4 s^-1  to 0.003 3 s^-1, whereas removal rate increased from 53.9% to 85.8%. With the electrolyte dosage increased from 1 g to 4 g, the removal rate constant increased from 0.001 7 s^-1 to 0.005 1 s^-1, whereas the removal rate increased from 61.0% to 94.2%. When the current density increased from 18.75 mA/cm² to 75.00 mA/cm², the removal rate constant increased from 0.000 3 s^-1 to 0.003 8 s^-1, whereas the removal rate increased from 18.1% to 92%. The effect of the initial concentration of methylene blue was small. When the addition of electrolyte is insufficient or the current density was significantly large, the temperature of the solution increased considerably, and the excess electric energy is converted into the thermal energy of the solution.

Key words: boron-doped diamond film electrode, methylene blue, nfluence factors, reaction kinetics simulation