Electrolysis Conditions Optimization of 4-Chlorophenol Degradation with Pd/graphene Gas-diffusion Electrode by Response Surface Methodology

摘要

In order to find the best electrolysis conditions for 4-Chlorophenol degradation, adopted responsesurface methodology (RSM) and central composite design (CCD) to investigate the current density,electrolyte concentration, initial pH and reaction time. A basic quadratic equation for the degradationefficiency of 4-chlorophenol was expressed as a function of individual variables. The results indicated2 that the linear effects and the quadratic effects of the individual variables (R reached 0.8062 and0.8230 and was close to 1) were statistically significant. The model provided the optimized conditionsas follows: the initial pH was 7.00, electrolyte (Na2SO4) concentration was 0.02 mol/L, the current2 density was 23 mA/cm , and the reaction time was 120 min. The degradation efficiency of the cathodiccompartment was more than 95.4%, while anodic compartment degradation efficiency was 91.1%.Ultimately, 4-chlorophenol was efficiently degraded under the synergistic effect of reduction andoxidation in the present system.