Photoelectrocatalytic oxidation of formaldehyde using a Ti/TiO _2 foil electrode. Application for its novel and simple photoelectrochemical determination

摘要

It was firstly described, that a TiO _2 film modified titanium foil electrode (Ti/TiO _2) shows an efficient photoelectrocatalytic activity towards formaldehyde oxidation in a phosphate buffer solution. Ti/TiO _2 foil electrode was prepared by anodizing Ti foil in aqueous solution. Also, this electrode was applied for the hydrodynamic photoamperometry measurement of formaldehyde in the optimum conditions (pH 7.0 as biological pH and bias potential 0.8 V vs. reference electrode). The photoelectrocatalytic oxidation photocurrent of the photoelectrode determined by photoamperometry method was linearly dependent on the formaldehyde concentration and the linearity range obtained was 6.70×10 ~(-4)-1.48×10 ~(-2) mol L ~(-1). Detection limit was found to be 3.09×10 ~(-4) mol L ~(-1) (2σ).