Synthesis and Characterization of Poly(azomethine)/ZnO Nanocomposite Toward Photocatalytic Degradation of Methylene Blue, Malachite Green, and Bismarck Brown

Abstract

This research was carried out based on the significance of protecting the environment by preventing the contamination of water caused from effluents discharge from dyeing industries, effective nanocomposite were prepared to solve this problem. The poly(azomethine), ZnO, and poly(azomethine)/ZnO nanocomposites were prepared and characterized by Fourier transform-infrared spectroscopy, ultraviolet (UV)–visible spectroscopy, powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDAX), scanning electron Microscope (SEM), and transmission electron microscopy (TEM) techniques. Methylene blue (MB), Malachite green (MG), and Bismarck brown (BB) were degraded from water using poly(azomethine) (PAZ), zinc oxide (ZnO), PAZ/ZnO (PNZ) nanocomposites as photocatalyst in the presence of natural sunlight. The degradation efficiency and reaction kinetics were calculated, and the outcome of the photocatalytic experiments proved that the PAZ/ZnO nanocomposites reveals excellent photocatalytic activity and effective for decolorization of dye containing waste water than PAZ and ZnO in the presence of natural sunlight. The maximum degradation efficiency 97%, 96%, and 95% was obtained for PNZ nanocomposites at optimum dosage of catalyst as 500 mg and 50 ppm of MB, MG, and BB dye concentration, respectively. The maximum degradation time was 5 h. After photocatalytic study, the samples were characterized by Fourier-transform infrared spectroscopy (FT-IR) and UV–visible spectroscopy.

Conducting polymers/zinc oxide-based photocatalysts for environmental remediation: a review

“…The dose of the photocatalyst was taken 500 mg, while the dye was taken in 50 mg L −1 concentration. The degradation efficiency was found 97% for MB and 96%, 95% were found for malachite green and Bismarck brown dyes in 5 h and the rate constant of pseudo-first-order reaction kinetics was found 0.2803, 0.3232, and 0.3762 min −1 for methylene blue, malachite green, and brilliant blue dyes, respectively (Pradeeba and Sampath 2019 ).…”

Photodegradation, thermodynamic and kinetic study of cationic and anionic dyes from effluents using polyazomethine/ZnO and polyazomethine/TiO2 nanocomposites

“…Under sonication, ZnO or TiO 2 nanoparticles are liberated in acetone and simultaneously added to the polymeric solution. The precipitated ZnO incorporated polyazomethine (PNZ) or TiO 2 incorporated polyazomethine (PNT) composite material is filtered, washed repeatedly in acetone and dried out [24].FT-IR spectroscopy, UV-Vis spectroscopy, scanning electron microscopy, transmission electron microscopy and Energy Dispersive Analysis X-ray powder X-ray diffraction were used to verify the synthesised polyazomethines (PNT & PNZ) [25][26][27][28][29][30][31].…”

The effect of pH on the photocatalytic degradation of cationic and anionic dyes using polyazomethine/ZnO and polyazomethine/TiO2 nanocomposites

“…About 500 mg of polyazomethine (Vasanthi and Ravikumar, 2013) is suspended in 100 mL of dimethyl formamide solution under steady stirring and sonicated for 48 h. Simultanously, nanoparticles (TiO2&ZnO) is diffused in acetone, sonicated and added immediately into the polymeric solution under sonication. The precipitated polyazomethines (PNT & PNZ) composite material is filtered, washed repeatedly in acetone and dried out 2019). The synthesized polyazomethines (PNT & PNZ) were verified using FT-IR spectroscopy (BRUKER EQUINOX-55), UV-Vis spectroscopy (SHIMADZU), powder X-ray diffraction (Scintag-XDS-2000 meter), scanning electron microscope (JSM-7600F Japan), transmission electron microscopy (JEOL model 2100) and energy dispersive analysis X-ray 2019).…”

“…The precipitated polyazomethines (PNT & PNZ) composite material is filtered, washed repeatedly in acetone and dried out 2019). The synthesized polyazomethines (PNT & PNZ) were verified using FT-IR spectroscopy (BRUKER EQUINOX-55), UV-Vis spectroscopy (SHIMADZU), powder X-ray diffraction (Scintag-XDS-2000 meter), scanning electron microscope (JSM-7600F Japan), transmission electron microscopy (JEOL model 2100) and energy dispersive analysis X-ray 2019).…”

“…Photodegradation efficiency was found to be low in acidic pH but with gradually rise in pH and efficient decolourization of the MB dye was attained at basic pH at 8. At basic pH, OH‾ radical shall mix with the holes situated in the photocatalyst exterior, creating additional OH‾ radical (Pradeeba et al, , 2019. While the OH‾ radical are the mainly domineering oxidizing group in the photo deprivation method, elevated deprivation of MB dye occurs at the basic medium.…”