Porous calcium titanate and sorption and desorption of water under ambient conditions: a study by conventional and synchronous luminescence spectroscopy

Alzahrani, Azzah; Samokhvalov, Alexander

doi:10.1007/s10934-016-0354-1

Cited by 7 publications

(2 citation statements)

References 45 publications

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“…A band appears in this region at ~601 nm, corresponding to orange (2.1 eV), which indicates the presence of Ti 3+ ions located in octahedral sites, related to the strong crystalline field of the structure. Furthermore, these bands suggest the presence of surface defects and oxygen vacancies in the system [60,78].…”

Section: Photoluminescence Spectroscopymentioning

confidence: 96%

Nanoparticles of the Perovskite-Structure CaTiO3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants

Cerón-Urbano,

Aguilar,

Diosa

et al. 2023

Nanomaterials

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In this research work, the photocatalytic capacity shown by the nanoparticles of the CaTiO3 system was evaluated to degrade two pollutants of emerging concern, namely methyl orange (MO)—considered an organic contaminating substance of the textile industry that is non-biodegradable when dissolved in water—and levofloxacin (LVF), an antibiotic widely used in the treatment of infectious diseases that is released mostly to the environment in its original chemical form. The synthesis process used to obtain these powders was the polymeric precursor method (Pechini), at a temperature of 700 °C for 6 h. The characterization of the obtained oxide nanoparticles of interest revealed the presence of a majority perovskite-type phase with an orthorhombic Pbnm structure and a minority rutile-type TiO2 phase, with a P42/mnm structure and a primary particle size <100nm. The adsorption–desorption isotherms of the synthesized solids had H3-type hysteresis loops, characteristic of mesoporous solids, with a BET surface area of 10.01m2/g. The Raman and FTIR spectroscopy results made it possible to identify the characteristic vibrations of the synthesized system and the characteristic deformations of the perovskite structure, reiterating the results obtained from the XRD analysis. Furthermore, a bandgap energy of ~3.4eV and characteristic emissions in the violet (437 nm/2.8 eV) and orange (611 nm/2.03 eV) were determined for excitation lengths of 250 nm and 325 nm, respectively, showing that these systems have a strong emission in the visible light region and allowing their use in photocatalytic activity to be potentialized. The powders obtained were studied for their photocatalytic capacity to degrade methyl orange (MO) and levofloxacin (LVF), dissolved in water. To quantify the coloring concentration, UV–visible spectroscopy was used considering the variation in the intensity of the characteristic of the greatest absorption, which correlated with the change in the concentration of the contaminant in the solution. The results showed that after irradiation with ultraviolet light, the degradation of the contaminants MO and LVF was 79.4% and 98.1% with concentrations of 5 g/L and 10 g/L, respectively.

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Section: Photoluminescence Spectroscopymentioning

confidence: 96%

Nanoparticles of the Perovskite-Structure CaTiO3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants

Cerón-Urbano,

Aguilar,

Diosa

et al. 2023

Nanomaterials

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“…Recently, SLS was successfully applied for size dependent simultaneous analysis of CdTe nanocrystals (NCs) and their mixtures [5], to study the midgap electronic states in nanocrystalline SrTiO3 [6], CaTiO 3 [7], anatase and rutile TiO 2 [8,9]. Herein, we report the application of SLS to detect luminescence centers in homogeneous Cd 0.3 Zn 0.7 S NCs prepared by wet chemical method.…”

Section: Introductionmentioning

confidence: 99%

Detection of Luminescence Centers in Colloidal Cd\(_{0.3}\)Zn\(_{0.7}\)S Nanocrystals by Synchronous Luminescence Spectroscopy

Thang¹,

Tuyen

Quang

et al. 2020

Comm. in Phys.

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With the advantages of selectivity, spectral resolution and reduction of interference on account of light scattering, synchronous luminescence spectroscopy (SLS) is successfully applied to analyze complex mixtures with overlapped emission and/or excitation spectra. In fact, it is difficult to clearly distinguish the contributions of various luminescence centers to low-energy band of semiconductor nanocrystals (NCs). Herein, we report the application of SLS method to detect luminescence centers in colloidal Cd0.3Zn0.7S NCs. Their conventional luminescence and synchronous luminescence spectra were comparatively investigated. Differently from conventional luminescence spectrum, the emission peaks at 460 and 515 nm were found using SLS method. They are attributed to the emission transitions related to sulfur and zinc/cadmium vacancies. The obtained results are useful to clarify the nature of luminescence centers as well as relaxation mechanism in CdxZn1-xS NCs.

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Effect of Mg2+ doping and Mn2+ Co-doping on the structural, optical, and photocatalytic properties of CaTiO3 nanopowders prepared by the sol–gel method

Mihoubi,

Belmokhi,

Dogan

et al. 2024

Appl. Phys. A

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Porous calcium titanate and sorption and desorption of water under ambient conditions: a study by conventional and synchronous luminescence spectroscopy

Cited by 7 publications

References 45 publications

Nanoparticles of the Perovskite-Structure CaTiO3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants

Nanoparticles of the Perovskite-Structure CaTiO3 System: The Synthesis, Characterization, and Evaluation of Its Photocatalytic Capacity to Degrade Emerging Pollutants

Detection of Luminescence Centers in Colloidal Cd\(_{0.3}\)Zn\(_{0.7}\)S Nanocrystals by Synchronous Luminescence Spectroscopy

Effect of Mg2+ doping and Mn2+ Co-doping on the structural, optical, and photocatalytic properties of CaTiO3 nanopowders prepared by the sol–gel method

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