Synthesis of a simplified iron(III) tetraamido macrocyclic ligand (FeIII-TAML) catalyst and its catalytic activity for degradation of dye wastewater by H2O2

Abstract

To reduce the cost of water treatment reagents, a simplified iron(III) tetraamido macrocyclic ligand compound (FeIII-TAML) was synthesized with a total yield of 53.3%. For comparison, two second generation FeIII-TAML catalysts were synthesized. The synthetic route was optimized, and the total yield increased from 30.1% to 49.5%. The catalytic activity of the simplified catalyst for degradation of dye wastewater by hydrogen peroxide was tested and compared with that of the second generation FeIII-TAML catalysts. The experimental results show that the simplified catalyst has good catalytic activity. At 25 °C, pH = 8, CFe-TAML = 50 mg/L, and Chydrogen peroxide = 1.5 g/L, the decolorization and chemical oxygen demand removal of methylene blue, methyl orange, neutral red, and Rhodamine B dye wastewater were 74.8%–96.1% and 46.9%–63.7%, respectively.