Enhanced photocatalytic activities of CeO2@ZnO core-shell nanostar particles through delayed electron hole recombination process

Meenakshi, G.; Sivasamy, A.

doi:10.1016/j.colsurfa.2022.128920

Cited by 23 publications

(9 citation statements)

References 47 publications

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“…The CeO 2 (111) peak is associated with the cubic structure. Samples S2 and S3 show the peaks corresponding to the polycrystalline structures of pure oxides, indicating the formation of composite materials with no other impurities [ 47 , 48 , 49 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

“…FTIR analysis confirms that the organic phase has been eliminated by calcination. The peaks in the 3400–3450 cm −1 range are due to adsorbed water molecules (the O-H bond stretching vibration), and those in the 550–400 cm −1 range are generated by the vibrations of the metal oxide bonds [ 49 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

“…When CeO 2 /ZnO —based photocatalytic materials are irradiated with UV rays, pairs of electric charge holes in the valence band and electric charge electrons in the conduction band are formed. The holes immediately react with water molecules or hydroxyl ions and form hydroxyl radicals, which are very strong oxidizing agents of organic molecules, according to the following Equations (2)–(9) [ 29 , 43 , 49 ]:

…”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic Removal of Antibiotics from Wastewater Using the CeO2/ZnO Heterojunction

et al. 2023

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CeO2/ZnO-based photocatalytic materials were synthesized by the sol-gel method in order to establish heterojunctions that increase the degradation efficiency of some types of antibiotics by preventing the recombination of electron–hole pairs. The synthesized materials were analysed by XRD, SEM, EDAX, FTIR, and UV-Vis. After several tests, the optimal concentration of the catalyst was determined to be 0.05 g‧L−1 and 0.025 g‧L−1 for chlortetracycline and 0.05 g‧L−1 for ceftriaxone. CeO2/ZnO assemblies showed much better degradation efficiency compared to ZnO or CeO2 tested individually. Sample S3 shows good photocatalytic properties for the elimination of ceftriaxone and tetracycline both from single solutions and from the binary solution. This work provides a different perspective to identify other powerful and inexpensive photocatalysts for wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

…”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic Removal of Antibiotics from Wastewater Using the CeO2/ZnO Heterojunction

et al. 2023

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“…Photocatalysts have been proven to be the best candidates for the degradation of organic pollutants. Their performance can be further improved by introducing a metal which contributes to a delay of electron recombination holes as well as lowering the band gap to obtain a spontaneous photodegradation [12,16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of eco-friendly ZnO-based heterophotocatalysts with enhanced properties under visible light

Mougnol

Waanders

Ntwampe

et al. 2022

Preprint

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Heterogeneous photocatalysts have been widely used for the removal of various organic pollutants from wastewater. The main challenge so far resides in the sustainability of the process, with regard to the synthesis and the application under visible light. In this study the precipitated materials from the moringa oleifera seed (MO), groundnut shells (GS) and apatite (A) agrowastes were functionalized with zinc oxide (ZnO) and silver (Ag) solution, to produce novel bioheterophotocatalysts. Various analytical techniques such as scanning electron microscope (SEM), energy-dispersive x-ray spectroscopy (EDS), photoluminescence (PL) and x-ray diffraction (XRD) analyses were used for the characterization of the novel photocatalysts. It was proven that, besides the addition of metals into a semiconductor, agrowastes were also proven to be even better to enhance the photocatalytic activity of a ZnO-based photocatalyst. The combination of MO/GS/A/ZnO/Ag in a 1:1:1 ratio, resulted in a lower band gap of 1.59 eV, as compared to the larger band gap of 2.96 eV for ZnO/ Ag. These photocatalysts' efficiency was also tested on the photodegradation of PAHs derived from coal leaching in various water sources such as acidic mine drainage, alkaline mine drainage and sewage wastewater. From MO/GS/A/ZnO/Ag, the removal efficiency was obtained to be 69.59%, 62.19% and 61.68% while 52.62%, 37.96 and 44.30% using ZnO/Ag in acidic mine drainage, alkaline mine drainage and sewage wastewater in 60 min under solar irradiation. Which happens to highly influence the destabilization of PAHs in the water sources.

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Section: Introductionmentioning

confidence: 99%

Synthesis of eco-friendly ZnO-based heterophotocatalysts with enhanced properties under visible light in the degradation of organic pollutants

et al. 2022

View full text Add to dashboard Cite

Heterogeneous photocatalysts have been widely used for the removal of various organic pollutants from wastewater. The main challenge so far resides in the sustainability of the process, with regard to the synthesis and the application under visible light. In this study the precipitated materials from the Moringa oleifera seed (MO), groundnut shells (GS) and apatite (A) agrowastes were functionalized with zinc oxide (ZnO) and silver (Ag) solution, to produce a novel bioheterophotocatalysts. Various analytical techniques such as scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), photoluminescence (PL) and X-ray diffraction (XRD) were used for the characterization of the novel photocatalysts. It was proven that agrowastes can also enhance the photocatalytic activity of a ZnO-based photocatalyst as pure metals. The combination of MO/GS/A/ZnO/Ag in a 1:1:1 ratio resulted in a lower band gap of 1.59 eV, as compared to the band gap of 2.96 eV for ZnO/Ag. These photocatalysts' efficiency was also tested on the photodegradation of polycyclic aromatic hydrocarbon (PAHs) derived from coal leaching in various water sources such as acidic mine drainage, alkaline mine drainage and sewage wastewater. From MO/GS/A/ZnO/Ag, the removal efficiency was found to be 69.59%, 61.07% and 61.68%, compared to 52.62%, 37.96 and 44.30% using ZnO/Ag in acidic mine drainage, alkaline mine drainage and sewage wastewater for 60 min under solar irradiation.

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Enhanced photocatalytic activities of CeO2@ZnO core-shell nanostar particles through delayed electron hole recombination process

Cited by 23 publications

References 47 publications

Photocatalytic Removal of Antibiotics from Wastewater Using the CeO2/ZnO Heterojunction

Photocatalytic Removal of Antibiotics from Wastewater Using the CeO2/ZnO Heterojunction

Synthesis of eco-friendly ZnO-based heterophotocatalysts with enhanced properties under visible light

Synthesis of eco-friendly ZnO-based heterophotocatalysts with enhanced properties under visible light in the degradation of organic pollutants

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