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Imine-Decorated Copper-Based Metal-Organic Framework for the Photodegradation of Methylene Blue

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Abstract

A low cost imine-decorated linker, 4,4'-(hydrazine-1,2-diylidenedimethylylidene)dibenzoic acid was utilized for the preparation of copper-based metal–organic framework (MOF) denoted as Cu-L via a solvothermal technique. The synthesized MOF material has been fully characterized by different analytical techniques such as Fourier-transform infrared (FT-IR) spectroscopy, powder X-Ray diffraction (PXRD), scanning electron microscopy (SEM), energy dispersive X-Ray spectroscopy (EDX), nitrogen adsorption–desorption isotherm analysis, and thermogravimetric analysis (TGA). It has been found that the coordination of Cu2+ with L considerably reduced the band gap of the L of nearly about 1 eV, which is approximately 26% decline in total. Notably, a narrow band gap of the photocatalyst is an essential requirement for the proficient photodegradation of organic contaminants. An excellent optical properties and narrow band gap of (2.8 eV) of Cu-L ensure their suitability as a photocatalyst for the degradation of methylene blue (MB) dye. In the presence of Cu-L photocatalyst, 84.22% degradation of MB dye was observed after 150 min under sunlight exposure. It is the first time that imine-functionalized MOF was utilized for the degradation of MB dye under sunlight irradiation. For understanding the photodegradation of MB dye by the Cu-L photocatalyst, all the plausible mechanistic studies have been carried out in detail. Both theoretical (with the help of density functional theory (DFT) calculations) as well as experimental studies have been conducted to justify the possible mechanisms for the photodegradation of MB dye by Cu-L. The current work may open a new opportunity to construct a cheap MOF-based photocatalysts for fast degradation of dye contaminants.

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Acknowledgements

The author Manpreet Kaur (MK) thank the Chemistry Department, Punjabi University, Patiala, for providing the laboratory and instrument facilities. Manpreet Kaur is also grateful for the UGC-SRF fellowship, UGC, New Delhi, India.

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  1. Department of Chemistry, Punjabi University, Patiala-147002, Punjab, India

    Manpreet Kaur

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Manpreet Kaur: Performed the experimentation and done the writing of the research work.

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Correspondence to Manpreet Kaur.

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Highlights

• A low cost imine-decorated copper-based MOF coded as Cu-L was synthesized solvothermally.

• Cu-L photocatalytically decolorize the water containing methylene blue (MB) dye.

• Cu-L shows 84.22% degradation efficiency within 150 min under sunlight exposure.

• Cu-L photocatalyst could be easily recycled up to 4 cycles with no loss in photocatalytic activity.

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Kaur, M. Imine-Decorated Copper-Based Metal-Organic Framework for the Photodegradation of Methylene Blue. J Fluoresc 34, 1119–1129 (2024). https://doi.org/10.1007/s10895-023-03346-5

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