Photocatalytic Oxidation of Cadmium-EDTA with Titanium Dioxide

摘要: Ethylenediaminetetraacetic acid (EDTA) forms stable complexes with toxic metals such as cadmium. Metal-EDTA chelates are chemically and occur in a number of waste situations. The viability using photocatalytic oxidation titanium dioxide to degrade Cd-EDTA was examined at concentrations from 2 × 10-5 10-3 M pH 3 8. Initially portion the complex adsorbed onto TiO2 photocatalyst low pH. However, independent degree initial adsorption, rapidly destroyed little dependence on Concurrently, most cases cadmium liberated Cd2+ no affiliation organic reaction products; its fate depended suspension At pH, Cdaq2+ released into solution. Also, carbon solution EDTA occurred. higher Cd adsorption equilibrium levels. Major products detected include formaldehyde, formic acid, acetic acid. Nitrate glyoxylic, malonic, a...