Synthesis and characterization of polymer supported Fe-phthalocyanine entangled with carboxyl functionalized benzimidazolium moiety: A heterogeneous catalyst for efficient visible-light-driven degradation of organic dyes from aqueous solutions

摘要

Phthalocyanines (Pc) are good photosensitizers due to the intensive colour that makes them suitable in oxidation and reduction besides their applications in pigments. In this study, a polymer supported Fe-Phthalocyanine entangled with carboxyl functionalized benzimidazolium moiety (PSFePcCFBM) was synthesized and characterized by analytical techniques such as Fourier-Transform Infrared Spectroscopy (FT-IR), Fourier-Transform Nuclear Magnetic Resonance (FT-NMR) and Thermo Gravimetric Analysis (TGA). The photocatalytic activity of the heterogeneous PSFePcCFBM catalyst was assessed for the degradation of the Methylene Blue (MB), Methyl Violet (MV) and Congo Red (CR). The change in concentration of the dyes was studied by UV-Visible spectroscopy and the degradation dye was confirmed by GC MS. The complete photocatalytic degradation of the MB, MV and CR was achieved in 60 min with 10 mg, 15 mg and 12.5 mg catalyst respectively with atmospheric air. The catalyst showed admirable activity towards the degradation, devoid of any additives such as ZnO/FiO(2) in the presence of 5 W LED lamp as a source of light, and was highly recyclable. Therefore, it was inferred that this protocol is suitable for the degradation of organic pollutants effectively in the absence of any additives. (C) 2019 Elsevier B.V. All rights reserved.