Evolution of photocatalytic activity of CeO2–Bi2O3 composite material for wastewater degradation under visible-light irradiation

Masula, Keshavulu; Yadagiri, B.; Rao, G. Raghav; Kumar, Praveen; Pola, Someshwar; Manohar, B.

doi:10.1016/j.optmat.2022.112201

Cited by 28 publications

(13 citation statements)

References 54 publications

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“…The improved photocatalytic performance of the 1Ce1Bi sample can be caused by several effects. In addition to the change in surface and adsorption properties, Bi doping causes disorders and defects in the ceria structure (see Raman and XPS results) that can act as trapping sites for excited electrons and holes, which can lead to their better separation and thus restrict their recombination . Moreover, Bi doping decreased the band gap (Figure S5), which should lead to easier (faster) excitation of the electrons that can be trapped on the defects and disorders caused by Bi doping .…”

Section: Resultsmentioning

confidence: 99%

Cerium–Bismuth Oxides/Oxynitrates with Low Toxicity for the Removal and Degradation of Organophosphates and Bisphenols

Henych

Šťastný

Němečková

et al. 2022

ACS Appl. Nano Mater.

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Nanoscale cerium–bismuth oxides/oxynitrates were prepared by a scalable low-temperature method at ambient pressure using water as the sole solvent. Solid solutions were formed up to a 1:1 Ce/Bi molar ratio, while at higher doping levels, bismuth oxynitrate photocatalysts with a pronounced layered structure were formed. Bismuth caused significant changes in the structure and surface properties of nanoceria, such as the formation of defects, oxygen-containing surface groups, and Lewis and Brønsted acid sites. The prepared bifunctional adsorbents/photocatalysts were efficient in the removal of toxic organophosphate (methyl paraoxon) from water by reactive adsorption followed by photocatalytic decomposition of the parent compound and its degradation product (p-nitrophenol). Bi-doped ceria also effectively adsorbed and photodegraded the endocrine disruptors bisphenols A and S and outperformed pure ceria and the P25 photocatalyst in terms of efficiency, durability, and long-term stability. The very low toxicity of Bi-nanoceria to mammalian cells, aquatic organisms, and bacteria has been demonstrated by comprehensive in vivo/in vitro testing, which, in addition to its simple “green” synthesis, high activity, and durability, makes Bi-doped ceria promising for safe use in abatement of toxic chemicals.

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Section: Resultsmentioning

confidence: 99%

Cerium–Bismuth Oxides/Oxynitrates with Low Toxicity for the Removal and Degradation of Organophosphates and Bisphenols

Henych

Šťastný

Němečková

et al. 2022

ACS Appl. Nano Mater.

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“…This indicates good conductivity and faster charge transfer of the photocatalyst, coinciding with the PL and photocurrent results. 44 Hence, Ag/PdTO is favorable for transition of the charge-carriers and impedes the rate of recombination of electron–hole pairs.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of titanates for photomineralization of industrial wastewater and organic pollutants

Gade

Manohar

Simhachalam

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…Therefore, researchers are focusing on enhancing their light response, especially to simulated sunlight, through ion doping, surface modification, and heterostructural construction (Cheng et al, 2022;Gao et al, 2022;Prajapati et al, 2022). Generally, when heterojunctions are constructed, the coupling of semiconductor materials with a small band gap that can respond to simulated sunlight and semiconductor materials with a wide band gap is selected to enhance the photocatalytic activity of the system (Jing et al, 2022;Masula et al, 2022;Yu et al, 2023). Although BaTiO 3 and CeO 2 have been coupled together, there are no reports of coupling the two to construct special oxygen vacancies to study their photocatalytic activity (Tarasevich and Lebedev, 2010;Khatkhatay et al, 2013;Rehman et al, 2021;Yan et al, 2022a;Yan et al, 2022b).…”

Section: Introductionmentioning

confidence: 99%

Construction of BaTiO3/CeO2 heterojunction and comparative study on photocatalytic activity of degradation of different drugs

2023

Front. Mater.

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A type II band aligned BaTiO3/CeO2 photocatalysts was constructed by a simple one-step solution synthesis method. The BaTiO3/CeO2 photocatalysts contain only cubic phase BaTiO3 and CeO2, and the particles are approximately spherical with a small amount of adhesion and agglomeration, and the average particle size is about 50 nm. Transmission electron microscopy (TEM) observation and element Mapping characterization confirmed the formation of special heterojunction between BaTiO3 and CeO2 and the presence of a large number of oxygen vacancies, which resulted in high visible optical absorption coefficient. The BaTiO3/CeO2 photocatalysts demonstrated high photocatalytic activity for the degradation of oxytetracycin hydrochloride, and the optimal drug concentration, catalyst content and pH value are 50 mg/L, 1 g/L and 7, respectively. Simultaneously, the BaTiO3/CeO2 photocatalysts were selective for degradation of aureomycin hydrochloride, doxycycline hydrochloride and tetracycline hydrochloride. Other photocatalytic experiments show that the BaTiO3/CeO2 photocatalysts have high chemical and cyclic stability, and the synergistic effect of holes, hydroxyl radicals and superoxide radicals plays an important role in the whole photocatalytic process. This simple synthesis route provides a technical reference for constructing other wide-band gap semiconductors to respond to simulated sunlight.

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Evolution of photocatalytic activity of CeO2–Bi2O3 composite material for wastewater degradation under visible-light irradiation

Cited by 28 publications

References 54 publications

Cerium–Bismuth Oxides/Oxynitrates with Low Toxicity for the Removal and Degradation of Organophosphates and Bisphenols

Cerium–Bismuth Oxides/Oxynitrates with Low Toxicity for the Removal and Degradation of Organophosphates and Bisphenols

Synthesis of titanates for photomineralization of industrial wastewater and organic pollutants

Construction of BaTiO3/CeO2 heterojunction and comparative study on photocatalytic activity of degradation of different drugs

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