A Metal-Free Approach Based on Graphene Oxide-Modified Electrode for Monitoring the Photoelectrocatalytic Degradation of EDTA

A novel voltammetric method for the sensitive determination of ethylenediaminetetraacetic acid (EDTA) was developed based on a graphene oxide (GO) modified electrode. In acetate buffer solution, GO showed a voltammetric response composed of a sharp anodic peak and a weak cathodic peak. When EDTA was present in the solution, the voltammetric response of GO was suppressed. Under optimum conditions, the response of the GO-modified electrode was inversely proportional to the concentration of EDTA from 6.0 x 10(-7) to 1.0 x 10(-4) mol/L. Using such a GO-based voltammetry, the effective photoelectrocatalytic degradation of EDTA over a TiO2 film electrode was evaluated and some influencing factors were investigated.