Hydrothermal synthesis, phase structure, optical and photocatalytic properties of Zn<sub>2</sub>SnO<sub>4</sub> nanoparticles - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Colloid and Interface Science Année : 2015

Hydrothermal synthesis, phase structure, optical and photocatalytic properties of Zn2SnO4 nanoparticles

Résumé

Zinc stannate (Zn2SnO4 or ZTO) nanoparticles were synthesized via hydrothermal method using NaOH as a mineralizer. X-ray diffraction (XRD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) of the synthesized ZTO nanoparticles revealed the formation of highly pure ZTO phase with the spinel-like structure. The nanoparticles have spherical shape with an average size of about 25 nm. The Raman spectrum of the sample was dominated by the A1g vibration mode of pure ZTO phase. From UV–Vis measurement, a band gap Eg of 3.465 eV was determined. The photocatalytic activity of the ZTO nanoparticles was evaluated for the photodegradation of rhodamine B (RhB) under visible light irradiation. The influence of catalyst concentration and irradiation time on the photocatalytic process was investigated. The ZTO catalyst showed the best photocatalytic performance at a concentration of 0.2 g/L, and the photodecomposition of RhB followed first-order kinetics with a rate constant k<:i> = 0.0249 min−1. The ZTO-assisted photocatalytic degradation of RhB occurred via two competitive processes: a photocatalytic process and a photosensitized process. The detection of hydroxyl radicals by fluorescence measurements suggests that these species play an important role in the photocatalytic process.
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Dates et versions

hal-01246191 , version 1 (18-12-2015)

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Monaam Ben Ali, Fatiha Barka-Bouaifel, Habib Elhouichet, Brigitte Sieber, Ahmed Addad, et al.. Hydrothermal synthesis, phase structure, optical and photocatalytic properties of Zn2SnO4 nanoparticles. Journal of Colloid and Interface Science, 2015, 457, pp.360 - 369. ⟨10.1016/j.jcis.2015.07.015⟩. ⟨hal-01246191⟩
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