Synthesis and Characterization of a Perovskite Nanocomposite of CdTiO 3 @S with Orthorhombic Structure: Investigation of
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Synthesis and Characterization of a Perovskite Nanocomposite of CdTiO3@S with Orthorhombic Structure: Investigation of Photoluminescence Properties and Its Photocatalytic Performance for the Degradation of Congo Red and Crystal Violet Under Sunlight Tayebeh Tavakoli‑Azar1 · Ali Reza Mahjoub2 · Mirabdullah Seyed Sadjadi1 · Nazanin Farhadyar3 · Moayad Hossaini Sadr4 Received: 17 March 2020 / Accepted: 15 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Perovskite phase of CdTiO3 nanoparticles (CTO NP) was synthesized by a simple hydrothermal method at 180 °C for 12 h and 24 h. It was then annealed at 1050 °C for 3 h. Perovskite CdTiO3@S nanocomposites (CTO@S NCs) with a needle-like morphology were synthesized by mixing CTO and S powders at 600 °C for 2 h. The obtained samples were characterized by Fourier transform-infrared (FT-IR), X-ray diffraction (XRD), Thermogravimetric/differential scanning calorimetry analysis (TGA–DSC), Transmission electron microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDS), Zeta potential, N 2 adsorption–desorption isotherms, and UV–visible diffuse reflectance spectroscopy (DRS). The optical, photoluminescence, and photocatalytic properties were investigated further. The diffuse reflection adsorption spectrum indicated that absorption peaks of the CTO@S NCs with the various S contents (5–30%) shifted towards the visible region. Tauc’s plots presented the band gap energy values for direct transitions, whereby 2.98 eV and 2.51 eV were obtained for CTO and CTO@S NCs (30), respectively. Photoluminescence spectra excited at both 370 nm and 400 nm wavelengths revealed a decline in the intensity of the emission spectra and had a minor red-shift at λex = 370 nm. The photocatalyst performance was investigated for degradation of Crystal violet (CV) and Congo red (CR) dyes under natural sunlight. The results showed that the degradation efficiency of CTO@S NCs was better than that of CTO NP in both dyes. Kinetics studies indicated CTO@S NCs fallowed Pseudo-first- order kinetics for CV degradation and pseudo-second-order kinetics for CR degradation.
* Ali Reza Mahjoub [email protected] Tayebeh Tavakoli‑Azar [email protected] Mirabdullah Seyed Sadjadi [email protected] Nazanin Farhadyar [email protected] Moayad Hossaini Sadr [email protected] 1
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran
2
Department of Chemistry, Faculty of Basic Sciences, Tarbiat Modares University, Tehran 14115–175, Iran
3
Department of Chemistry, Varamin‑Pishva Branch, Islamic Azad University, Varamin 33817‑74895, Iran
4
Department of Chemistry, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, Iran
13
Vol.:(0123456789)
Journal of Inorganic and Organometallic Polymers and Materials
Graphic Abstract
Keywords Perovskite · CdTiO3@S NCs · Photoluminescence · Photocatalyst · Degradation · Sunlight
1 Introduction Perovskite is a compound with the general formu
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