Abstract
Recently, the fabrication of heterogeneous catalysts using biopolymers has been considered due to some advantages such as biodegradability, easy handling, high efficiency and so on. In this work, 5-amino-1H-tetrazole modified kraft lignin/Fe3O4 supported highly catalytic active copper complex (Fe3O4@LigA/Cu) has been synthesized as a novel catalyst. The support was prepared by the Mannich reaction of 5-amino-1H-tetrazole and kraft lignin. The prepared catalyst was characterized by different techniques including Fourier transform infrared (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), field emission scanning electron microscopy (FE-SEM), Energy-dispersive X-ray spectrometry (EDX), elemental mapping, Brunauer-Emmett-Teller (BET) and vibrating sample magnetometry (VSM). The Fe3O4@LigA/Cu catalyst was used in the catalytic reduction of organic pollutants such as 4-nitrophenol (4-NP), methylene blue (MB), and congo red (CR) using sodium borohydride (NaBH4) as the reducing agent and the catalytic efficiency was studied by UV–visible spectroscopy. Fe3O4@LigA/Cu catalyst showed high yield (˃ 99%) in the reduction of 4-NP in four min. Moreover, Fe3O4@LigA/Cu catalyst showed good recyclability and reusability. This work provides a simple method for the preparation of lignin based catalysts with high catalytic activity and easy recovery to degrade organic pollutants from aqueous solution.
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