sono-heterogeneous fenton system for degradation of ab74 dye over a new tetraaza macrocyclic schiff base cellulose ligand-loaded fe3o4 nanoparticles

The study detailed herein is related to the synthesis of novel tetraaza macrocyclic schiff base cellulose ligand: (eda-g-dac) via condensation reaction of periodate oxidized developed microcrystalline cellulose (dac) with ethylenediamine (eda) was reported. additionally, tetraaza macrocyclic schiff base cellulose ligand-loaded fe3o4 nanoparticles: [(eda-g-dac)@fe3o4] was successfully prepared using in situ chemical co-precipitation of coordinated ferric and ferrous ions in the tetraaza macrocyclic schiff base cellulose ligand: (eda-g-dac) under mild conditions. the synthesized compounds were investigated by x-ray diffraction (xrd), fourier transform infrared (ft-ir) spectroscopy, scanning electron microscope (sem), thermogravimetric analysis (tga) and vibrating sample magnetometer (vsm). [(eda-g-dac)@fe3o4] was of a narrow size distribution, and exhibited ferromagnetic behaviors with saturation magnetization 24.63 emu g−1. the degradation of indigo carmine (ab74) over [(eda-g-dac)@fe3o4] was studied using a coupled ultrasound/heterogeneous or sono-heterogeneous fenton process. more importantly, us + [(eda-g-dac)@fe3o4] + h2o2 were demonstrated for the first time as a high efficient for the degradation of ab74. the pseudo first-order-reaction constant of us + [(eda-g-dac)@fe3o4] + h2o2 were measured to be 0.0979 min−1. total organic carbon (toc) and chemical oxygen demand (cod) removal rates are 0% and 98.7%, respectively. additionally, the [(eda-g-dac)@fe3o4] showed the higher enhanced sonocatalytic degradation of ab74 than other dyes mb and ay17. furthermore, the catalysts can be easily recycled within 10 s using an external magnetic field and a constant catalytic activity is retained even after five cycles.