Removal of dissolved natural organic matter by the Al/Fe pillared clay-activated-catalytic wet peroxide oxidation: Statistical multi-response optimization

摘要: The removal of dissolved Natural Organic Matter (NOM) using the Fenton-like Catalytic Wet Peroxide Oxidation (CWPO) activated by an Al/Fe-pillared clay catalyst (Al/Fe-PILC) was optimized in a semi-batch reactor. The Al/Fe-PILC was prepared from concentrated precursors and fully characterized by standard physicochemical techniques (DRIFTS, powder XRD, XRF, CEC, N2-adsorption, and TGA/DSC analyses). NOM mineralization (removal of dissolved organic carbon – DOC), color removal, and the fraction of H2O2 consumed were all successfully maximized by a multi-response, statistical Desirability function. Circumneutral pH, starting NOM concentration, and temperature were all assessed as non-controllable variables (covariates) within ranges typical of real surface water. Found overall optimal conditions of reaction were 0.45 mg H2O2/mg DOC (∼3.2 mg/dm3 for 7.0 mg DOC/dm3) and 5.97 g/dm3 of the …