Electrochemical degradation of formaldehyde with a novel Pd/GO modified graphite electrode

摘要

A novel Pd/GO modified graphite electrode for anodic degradation of formaldehyde was successfullyprepared via impregnation and electrodeposition processes. The surface morphology of the modifiedelectrode was characterized by scanning electron microscope (SEM), energy dispersive X-rayspectroscopy (EDX), X-ray diffraction (XRD) and X-ray photoelectron spectroscopic (XPS)techniques. The electrocalytic behavior of the electrode was characterized by cyclic voltammetry, itindicated that the modified graphite had excellent catalytic performance. The as-depositedPd/GO/graphite modified electrode was applied to electro-degradation formaldehyde. Various factorsinfluencing the degradation efficiency of formaldehyde such as current density, initial concentration offormaldehyde and initial pH were systematically investigated. The removal efficiency of formaldehyde,COD and TOC could reach 90.6%, 83.6% and 85% in pH 4 after 120 min electrolysis with a 0.5 mol-1 -2 L Na2SO4 at a current density of 15 mA cm , which gave the direct evidence of the electrocatalyticcapability of the electrode. The electrochemical degradation of formaldehyde at Pd/GO/graphitefollowed pseudo-first-order kinetics. These results indicated that the Pd/GO/graphite modifiedelectrode would be a promising anode for electrochemical degradation of formaldehyde.