Catalytic activity evaluation of mesoporous α-GaOOH microspheres self-assembly

Muruganandham, M.; Suri, Rominder; Ahmmad, Bashir; Lee, Gang-Juan; Wu, Jerry J.

doi:10.1016/j.jiec.2014.12.008

Cited by 5 publications

(1 citation statement)

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“…According to the literature, the bandgap energy of gallium oxyhydroxide, determined by UV-vis spectroscopy, is between 4.75 and 5.06 eV; whereas for gallium oxide spans from 4.8 to 4.9 eV. [29][30][31][32][33] In this work, the bandgap energy value obtained for GaOOH and α-Ga 2 O 3 was the same for both compounds (5 eV) and is consistent with the literature (Figure 6). A gallium oxide sample taken after the degradation of malachite green was analyzed, and a slight reduction of the bandgap energy to 4.5 eV was measured (Figure 6c).…”

Section: Resultssupporting

confidence: 89%

α-Ga₂O₃ as a Photocatalyst in the Degradation of Malachite Green

Rodríguez

Álvarez

Flores‐Rivera

et al. 2019

ECS J. Solid State Sci. Technol.

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α-Ga2O3 is a wide-bandgap semiconductor material which was prepared by a novel synthesis method from metallic gallium. It was characterized by X-ray diffraction, infrared spectroscopy, ultraviolet spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy. This oxide was also evaluated as a photocatalyst toward the decomposition of malachite green (MG). X-ray photoelectron spectroscopy was used with the purpose of analyzing the changes on the surface of the material before and after the photocatalytic reaction. The results found by X-ray diffraction shows that alfa phase did not transform to another crystalline phase during the reaction. However, a slight change on the relative intensities of the planes (104) and (110), may explain the variation of the morphology of the oxide, associated to a preferential particle erosion. High resolution XPS analyses revealed a shift toward lower binding energies of the O1s level after the photocatalytic reaction, suggesting the presence of oxygen bound to carbonyls or alcohols. Organic nitrogenous residues associated to MG were also detected by the presence of the N1s band observed at 396.7 eV.

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Section: Resultssupporting

confidence: 89%