Synthesis and characterization of Dawson heteropolyanion [H_3Fe][α_2P_2MoW_(17)O_(62)]: application on dye degradation

摘要

An heteropolyanion compound consisting of saturated Dawson anions and trivalent iron cations, alpha 2H3FeP2W17MoO62 has been synthesized and characterized by various spectroscopic methods, IR, UV-Vis, P-31 NMR and ESI-MS. The catalytic performances of heteropolyanion were tested for degradation of aqueous Malachite Green dye under Fenton process. The degradation reaction was monitored by UV-visible and IR spectroscopy. The effects of different reaction parameters such as the initial pH of the medium, the initial hydrogen peroxide concentration, the catalyst mass, the initial MG concentration and the reaction temperature on the oxidative degradation of malachite green has been investigated. The optimal reacting conditions were found to be pH = 3, initial hydrogen peroxide was 0.31 M, and the catalyst mass was 0.03 g, for initial MG concentration of 20 mg.L-1 at 30 degrees C. After optimizing operating parameters, the dye was demineralized after 7 h of reaction.