A visible light-sensitive argentous oxide/calcium aluminate nanocomposite photocatalyst

Sun, Zizhan; Cong, Qianmin; Wang, Xiaoyu; Cui, Jiayin; Cai, Zhengyu; Fan, Chuangang; Pei, Lizhai

doi:10.1080/02670836.2023.2237273

Materials Science and Technology

2023

DOI: 10.1080/02670836.2023.2237273

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A visible light-sensitive argentous oxide/calcium aluminate nanocomposite photocatalyst

Zizhan Sun,

Qianmin Cong,

Xiaoyu Wang

et al.

Abstract: A photo-deposition method was developed to synthesise argentous oxide/calcium aluminate nanocomposites (Ag2O-CAONCS) with orthorhombic Ca5Al6O14 and cubic Ag2O phases. Micro-morphology, micro-structure, optical, and visible-light catalytic properties were investigated via different techniques. Ag2O enhances visible-light absorption performance and decreases the band gap of the Ag2O-CAONCS. About 20 mL crystal violet (CV) dye (10 mgL–1) is totally degraded using 20 mg Ag2O-CAONCS under sunlight irradiation for … Show more

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2024

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Cited by 3 publications

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Effect of modified Ca-Al adsorbents on heavy metal fixation during co-combustion of coal and coconut shells: Experiments and simulations

You,

Yu,

et al. 2024

Environmental Pollution

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Effect of modified Ca-Al adsorbents on heavy metal fixation during co-combustion of coal and coconut shells: Experiments and simulations

You,

Yu,

et al. 2024

Environmental Pollution

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Lanthanide Metal-Doped Ca Aluminate Nanoflakes with Enhanced Photocatalytic Activity

Zhang,

Sun,

Ban

et al. 2024

MNS

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Background: Ca aluminate (CaAlO) is an important aluminate material that shows promising applications in optics, catalysts, photoelectrons, semiconductors, and biological materials. The band gap of the CaAlO nanoflakes is as large as 3.87 eV, limiting the application of the CaAlO nanoflakes. Thus, it is essential to research efficient methods for improving the photocatalytic performance of the CaAlO nanoflakes. The improvement of gentian violet degradation can be further enhanced by lanthanide metal doping. Methods: Lanthanide metal (La or Pr)-doped CaAlO nanoflakes were prepared using a simple method. Lanthanide metal-doped CaAlO nanoflakes were analyzed by electron microscopy, X-ray diffraction, photoelectron spectra, solid diffusion reflectance, and photoluminescence spectra. Results: La or Pr was incorporated into the CaAlO nanoflakes with orthorhombic Ca5Al6O14 phase. La dopant with the content of 8wt.% existed in the form of hexagonal La0.9Al11.7O19. Pr dopant induced the phase transformation from the orthorhombic Ca5Al6O14 phase to the cubic Ca3Al2O6 phase. The size of the doped nanoflakes reduced from 2 μm to 500 nm with increasing the content of lanthanide metal dopants. The band gap of the lanthanide metal-doped CaAlO nanoflakes decreased from 3.74 eV to 2.98 eV, decreasing the La dopant from 8 wt.% to 2 wt.%, 3.62 eV to 3.34 eV and improving Pr dopant from 2 wt.% to 8 wt.%. About 20 mL of 10 mgL-1 gentian violet was entirely removed using 2 wt.%-La-doped CaAlO nanoflakes under irradiation for 30 min, and 8wt.%-Prdoped CaAlO nanoflakes under irradiation for 50 min, respectively. 2wt.%-La-doped CaAlO nanoflakes exhibited the highest photocatalytic degradation reaction rate constant (0.115 min-1), which was 3.6 times as high as that of the CaAlO nanoflakes. The major reaction active substances involved in the photo-degradation were hydroxyl radicals and holes. Conclusion: Photocatalytic activity of the CaAlO nanoflakes towards gentian violet can be greatly enhanced by lanthanide metals owing to the harvest light absorption, reduced band gap, and recombination ability of photo-generated electron-hole pairs. other: The present work provides a good strategy for enhancing the photocatalytic activity of the CaAlO nanoflakes.

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Photocatalytic Activity of the Sb2O3/Ca5Al6O14 Nanoscale Composites for Crystal Violet Degradation

Ban,

Sun,

Cai

et al. 2024

NANOASIA

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Background: The discharging of crystal violet dye can contaminate water and soil, which causes serious environmental pollution and health problems for human beings. Sb2O3/Ca5Al6O14 nanoscale composites possess good catalytic performance for crystal violet removal. This study aimed to research the effects of the Sb2O3 content, content of the nanoscale composites, and metallic cations on the photocatalytic activity of the Sb2O3/Ca5Al6O14 nanoscale composites. Objective: The objective was to synthesize Sb2O3/Ca5Al6O14 nanoscale composites by a simple route and research the photocatalytic activity for crystal violet degradation. Methods: Sb2O3/Ca5Al6O14 nanoscale composites were obtained via a simple route using Ca aluminate nanosheets and Sb acetate. The photocatalytic activity of the Sb2O3/Ca5Al6O14 nanoscale composites was evaluated using crystal violet as a model pollutant. Results: The obtained nanoscale composites consisted of orthorhombic Ca5Al6O14 and orthorhombic Sb2O3 phases, nanosheets with a thickness of about 50 nm, and nanoparticles with a size of less than 100 nm. Sb2O3 enhanced the light absorption ability of the Ca aluminate nanosheets. The nanoscale composites with the Sb2O3 content of 20wt.% decreased to 3.03 eV, which is beneficial for improving the photo-degradation ability of the organic pollutants. The reaction ratio constant k for crystal violet (CV) degradation was 0.045 min-1 and 0.055 min-1 using the nanoscale composites with Sb2O3 content of 10wt.% and 20wt.%, respectively, which was 1.4 and 1.7 times higher than that of the Ca aluminate nanosheets (0.032 min-1). Hydroxyl radicals (●OH), hole (h+), and superoxide radicals (●O2 −) were reaction-active species for CV removal. Sb2O3/Ca5Al6O14 nanoscale composites exhibited fast interfacial charge transfer and efficient separation ability of photo-induced electron-hole pairs, which enhanced the photocatalytic activity of the Ca aluminate nanosheets for CV degradation. Conclusion: The Sb2O3/Ca5Al6O14 nanoscale composites can be easily separated and reused, showing great potential for practical application in wastewater treatment.

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A visible light-sensitive argentous oxide/calcium aluminate nanocomposite photocatalyst

Cited by 3 publications

References 56 publications

Effect of modified Ca-Al adsorbents on heavy metal fixation during co-combustion of coal and coconut shells: Experiments and simulations

Effect of modified Ca-Al adsorbents on heavy metal fixation during co-combustion of coal and coconut shells: Experiments and simulations

Lanthanide Metal-Doped Ca Aluminate Nanoflakes with Enhanced Photocatalytic Activity

Photocatalytic Activity of the Sb2O3/Ca5Al6O14 Nanoscale Composites for Crystal Violet Degradation

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