Study of optical properties of TiO2 nanoparticles and CdS@TiO2 nanocomposites and their use for photocatalytic degradation of rhodamine B under natural light irradiation

Abstract

In this study, we report the synthesis of two CdS@TiO2 nanocomposites (CT1 and CT2) by two-step low temperature solvothermal decomposition method using two different stoichiometric combinations between CdS and TiO2 nanoparticles (NPs). CdCl2(3-chlorobenzaldehyde thiosemicarbazone)2 was used as a molecular precursor to obtain CdS NPs, whereas titanium isopropoxide was used to obtain TiO2 NPs. The as-prepared CT nanocomposites were characterized by powder X-ray diffraction, field emission scanning electron microscopy, Raman spectroscopy, transmission electron microscopy and X-ray photoelectron spectroscopy to evaluate their structures and properties. Further, these nanocomposites were used for the photocatalytic degradation of rhodamine B under solar light irradiation. It is found that CdS@TiO2 (CT1) nanocomposite shows highest degradation efficiency of 98.74% within 60 min as compared to bare TiO2 NPs which shows only 66.40% degradation efficiency. The enhanced photocatalytic efficiency due to charge transfer properties of bare NPs and CT nanocomposites was further investigated by electrochemical analysis and photoluminescence studies.

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Acknowledgements

We are thankful to the Department of Science and Technology (DST-EMRF grant nos. EMR/2016/007052 and DST-PURSE), India, for providing financial support. We also acknowledge Department of Earth Science, Indian Institute of Technology, Bombay, for providing Raman Facility and MNIT, Jaipur, for providing XPS analysis.

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Correspondence to Shivram S Garje.

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Badhe, R.A., Ansari, A. & Garje, S.S. Study of optical properties of TiO2 nanoparticles and CdS@TiO2 nanocomposites and their use for photocatalytic degradation of rhodamine B under natural light irradiation. Bull Mater Sci 44, 11 (2021). https://doi.org/10.1007/s12034-020-02313-1

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Keywords

  • Molecular precursor
  • solvothermal method
  • composite materials
  • optical properties
  • photocatalytic activity