مشخصات پژوهش

Methylene blue is an instance of dyestuff that has considered as a harmful environmental pollutant and various studies have been taken for removing it from wastewaters during last years. At the present article, nanocrystalline M-type BaZn0.2Co0.2Sn0.4Fe11.2O19 hexagonal ferrite was prepared by sol-gel self-propagating combustion method. The synthesized sample decorated on modified multi-wall carbon nanotubes. For synthsise of BaZn0.2Co0.2Sn0.4Fe11.2O19/polyaniline, in-situ polymerization took place. The phase analyzing, morphology and magnetic properties of attained composites have been studied by X-ray diffractometer (XRD), Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared (FTIR) and Vibrating Sample Magnetometer (VSM) analyzes. The main purpose was photocatalytic degradation of MB by BaZn0.2Co0.2Sn0.4Fe11.2O19 (BZCS0.2) and its derivatives BaZn0.2Co0.2Sn0.4Fe11.2O19/MWCNT and BaZn0.2Co0.2Sn0.4Fe11.2O19/PANI composites under UV–visible irradiation. The results show that BaZn0.2Co0.2Sn0.4Fe11.2O19 has high magnetic saturation that makes it suitable for magnetic separation. On the other hand, UV–visible optical spectroscopy confirmed that BaZn0.2Co0.2Sn0.4Fe11.2O19 nanoparticles and its nanocomposites are capable of methylene blue (MB) degradation. The color of MB dispersion changed from deep blue to pale blue at the first 10 min of UV irradiation, and after 60 min BZCS0.2 shows photocatalytic degradation about 64%, while BaZn0.2Co0.2Sn0.4Fe11.2O19/PANI and BaZn0.2Co0.2Sn0.4Fe11.2O19/MWCNT degradation in 60 min is 80% and 87%, respectively. The reusability of samples repeated and represented that BaZn0.2Co0.2Sn0.4Fe11.2O19/MWCNT after three times had 80% photodegradation ability. So, based on the results, BaZn0.2Co0.2Sn0.4Fe11.2O19/MWCNT because of the extended surface of MWCNT, shows the best ability of MB degradation under UV–visible. Furthermore, Recycling experiment proves it as a potential practical application in MB removing from w