Synthesis, Crystal Structure and Spectral Characterization of a New Caesium–Sodium-Isopolyvanadate: Photodegradation of Methylene Blue Dye

• Published in: Journal of chemical crystallography Vol. 54; no. 2; pp. 132 - 139
• Main Authors: Kohanfekr, Tahmineh, Hakimi, Mohammad, Hosseini, Hasan Ali, Dusek, Michal, Kucerakova, Monika
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-06-2024; Springer Nature B.V
• Subjects: Catalytic activity; Cesium; Chemistry; Chemistry and Materials Science; Coordination; Crystal structure; Crystallography and Scattering Methods; Energy dispersive X ray analysis; Energy gap; Fourier transforms; Infrared analysis; Infrared spectroscopy; Inorganic Chemistry; Light irradiation; Methylene blue; Organometallic Chemistry; Original Paper; Oxidation; Photocatalysis; Photodegradation; Physical Chemistry; Raman spectroscopy; Single crystals; Sodium; Spectrum analysis; Structural analysis; Valence; Vanadium; X ray analysis; Polymetavanadate; Photocatalytic performance; Band-gap energy; Crystal structure
• ISSN: 1074-1542; 1572-8854
• DOI: 10.1007/s10870-024-01005-6

A new aqua-tricaesium-sodium polymetavanadate compound, [Cs
3
Na(VO
3
)
4
(H
2
O)] (
1
), was synthesized by reacting caesium chloride and sodium metavanadate at ambient pH. The structure was characterized and identified using single-crystal X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectroscopy, and energy dispersive X-ray analysis (EDS). Compound (
1
) crystallizes in an orthorhombic system with a Pnma space group, and cell parameters a = 11.6554(4), b = 8.3408(2), c = 16.1121(5). Vanadium has tetrahedral coordination connected to the next vanadium atom through an oxygen bridge. The infinite zigzag metavanadate chains formed by corner-sharing VO
4
tetrahedral constitute a1D building block. The chains were laterally connected through Cs, Na, and H
2
O. This connectivity generates continuous 2D layers within the ab plane. The photocatalytic performance of (
1
) was evaluated by measuring the degradation of methylene blue under visible light. The results confirmed the efficiency of the photocatalytic activity because of the narrowed bandgap energy of 2.18 eV, and 85% degradation rate, making it suitable for absorbing visible light.
Graphical Abstract
The paper reports the synthesise and characterization of a new isopolyvanadate compound, [Cs
3
Na(VO
3
)
4
H
2
O], which contains vanadim in the five oxidation state with tetrahedral coordination.  It forms metavanadate chains interconnected by caesium and sodium cations. The photocatalytic activity was tested by degrading methylen blue under visible light irradiation. The results showed decent activity attributed to the narrowed bandgap energy of 2.18 eV.