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Synthesis of mesoporous TiO2 and its role as a photocatalyst in degradation of indigo carmine dye

  • Brief Communication: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)
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Abstract

A modified sol–gel route without the use of acid or base was used to synthesize mesoporous TiO2 catalyst which was characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, atomic force spectroscopy, optical absorption spectroscopy and Brunauer–Emmett–Teller adsorption isotherm technique. The synthesized mesoporous TiO2 is highly crystalline, pure and consisting of very high porosity and surface area 226.25 m2 g−1. The catalyst showed an excellent photocatalytic activity against the degradation of indigo carmine in the presence of visible light. It was found that 50 mL dye solution of 4 × 10−5 M concentration has been completely degraded and decolorized with optimum catalyst dose of 1.5 g/L in 180 min, acidic pH and at 25 ± 1 °C reaction temperature. The reaction kinetic was studied, and it was found that the indigo carmine dye photocatalytic degradation followed pseudo first-order reaction kinetics with rate constant, k of 0.007 min−1. Degradation of dye was confirmed by chemical oxygen demand analysis and UV–Vis spectrophotometry.

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Acknowledgments

The authors like to acknowledge Department of Science & Technology, New Delhi, for funds and Junior Research Fellowship (JRF) and sophisticated instrumental laboratory, Department of Chemistry, Dr. Hari Singh Gour Central University, Sagar, India, for research facility.

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Authors and Affiliations

  1. Nanomaterials Discovery Laboratory, Department of Chemistry, Dr. H. S. Gour Central University, Sagar, Madhya Pradesh, 470 003, India

    Devendra Ahirwar, Mustri Bano & Farid Khan

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  1. Devendra Ahirwar
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  2. Mustri Bano
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  3. Farid Khan
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Correspondence to Farid Khan.

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Ahirwar, D., Bano, M. & Khan, F. Synthesis of mesoporous TiO2 and its role as a photocatalyst in degradation of indigo carmine dye. J Sol-Gel Sci Technol 79, 228–237 (2016). https://doi.org/10.1007/s10971-016-4039-7

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  • DOI: https://doi.org/10.1007/s10971-016-4039-7

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