Facile and green synthesis of a ZnO/CQDs/AgNPs ternary heterostructure photocatalyst: study of the methylene blue dye photodegradation

Bozetine, Hakima; Meziane, Smail; Aziri, Sabrina; Berkane, Nabila; Allam, Djaouida; Boudinar, Salem; Hadjersi, Toufik

doi:10.1007/s12034-021-02353-1

Cited by 28 publications

(10 citation statements)

References 56 publications

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“…Bozetine et al developed ZnO/CQDs/AgNPs by the green approach of the in situ hydrothermal method ( Bozetine et al, 2021 ). d -Lactose source of carbon and NaOH solution held in Teflon-beaker heated at 80°C for 15 min for the synthesis of CQD.…”

Section: Photocatalytic Applications Of Cqdsmentioning

confidence: 99%

Recent Progress on Carbon Quantum Dots Based Photocatalysis

Jung

Sapner

Adhikari³

et al. 2022

Front. Chem.

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Section: Photocatalytic Applications Of Cqdsmentioning

confidence: 99%

Recent Progress on Carbon Quantum Dots Based Photocatalysis

Jung

Sapner

Adhikari³

et al. 2022

Front. Chem.

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“…For this purpose, carbon quantum dots (CQDs) have experienced a remarkable interest in the carbon family especially due to their optical and electronic properties, as well as their excellent biocompatibility, high aqueous solubility, and low toxicity [16,17]. These impeccable properties make them ideal candidates for applications in the fields such as biomedical, optoelectronics, and photocatalysis [18]. In this regard, CQDs prepared by a green method in our previous work were used to fabricate ZnO/CQDs nanocomposite [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of synthesized carbon quantum dots on the photocatalytic properties of ZnO

Williams¹,

Fodjo²,

Narcisse³

et al. 2022

Bull. Chem. Soc. Eth.

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ABSTRACT. In this work, synthesized carbon quantum dots (CQDs) and zinc oxide nanoparticles (ZnO NPs) are used to form ZnO/CQDs nanocomposite. The characterization of this nanocomposite using X-ray diffraction (XRD) indicates that ZnO NPs and ZnO/CQDs nanocomposite have the same profile, suggesting that the presence of CQDs does not impinge the crystal structure of ZnO in ZnO/CQDs nanocomposite. Besides, an analysis performed with scanning electron microscopy (SEM) displays plate-like nanostructure with an average thickness of about 22 nm and 25 nm for ZnO NPs and ZnO/CQDs, respectively. Furthermore, the reflectance study in the visible range shows a reduction of sunlight reflection intensity of ZnO/CQDs compared with the reflection intensity of ZnO NPs. In addition, the photocatalytic studies indicate that the rate of photocatalytic degradation of methylene blue (MB) of ZnO/CQDs nanocomposites is higher than that of ZnO NPs. Indeed, in optimized conditions, the photocatalytic activity can reach 100% within 45 min of sunlight exposure for the degradation of 7.5 mg/L MB using ZnO/CQDs while it takes 90 min using ZnO NPs under the same conditions. These fascinating results is attributed to the reduction of the reflective properties of ZnO/CQDs. KEY WORDS: Fluorescent carbon quantum dots (CQDs), Photocatalytic degradation of methylene blue, Sunlight reflectance property, Synthesis of ZnO nanoparticles Bull. Chem. Soc. Ethiop. 2023, 37(2), 463-476. DOI: https://dx.doi.org/10.4314/bcse.v37i2.15

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“…Several semiconductor materials such as TiO 2 , CuO, SnO 2 , and ZnO have been investigated as photocatalysts [2][3][4]. Among these, ZnO is an interesting one, primarily due to its stability and unique opto-electronic properties.…”

Section: Introductionmentioning

confidence: 99%

“…Among these, ZnO is an interesting one, primarily due to its stability and unique opto-electronic properties. ZnO has a large band gap (E g ) of around 3.70 eV that can be specifically activated by ultra-violet (UV) light; a high carrier mobility for rapidly transferring electron-hole pairs to the material's surface; and a relatively stable chemical structure [4]. Furthermore, ZnO offers benefits in a variety of nano-structural fabrications.…”

Section: Introductionmentioning

confidence: 99%

“…Bozetine et al presented the simple and green synthesis of ZnO/carbon quantum dots (CQDs)/Ag nanoparticles (NPs) nanocomposites for photocatalytic application. The nanocomposites exhibited excellent photocatalytic performance due to the improved charge separation efficiency and increased surface area [4]. The charge separation improved because electrons can easily be transferred in the nanocomposites caused by the energy level adjustment for heterojunction interfaces.…”

Section: Introductionmentioning

confidence: 99%

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2021

DJNB

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In this work, Y-doped ZnO nanoparticles were precipitately synthesized for various yttrium molar percentage values ranging from 0 to 5%, and then utilized as photocatalysts to demonstrate methylene blue degradation. Morphology shows that the particle size of pure ZnO is 113.7733.26 nm, which is reduced to the minimum value less than one-third for the Y-doped ZnO samples. As a result, surface-to-volume ratios of Y-doped ZnO samples have successfully increased due to their decreased size. This decrease in particle size is consistent with the small crystalline size, primarily due to low crystallization in the presence of yttrium doping. However, the expansion of the crystal structure is observed. Chemical surface structures point to the major vibration of ZnO. However, some carbon-relating groups remain to appear. Optical property reveals similar trends for all Y-doped ZnO samples. The estimated band gap energy (E g ) was reduced to the minimum value for the 4 mol% condition. For use as a photocatalyst, the appropriate Y-doped ZnO for 4 mol% yttrium doping presents the maximum degradation efficiency of 61.19%. The improvement in photocatalytic degradation is caused by the synergy of decreased particle size and reduced E g . Therefore, yttrium plays a role to decrease particle size and reduce E g of Y-doped ZnO materials, thus leading to enhance photocatalytic performance.

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Facile and green synthesis of a ZnO/CQDs/AgNPs ternary heterostructure photocatalyst: study of the methylene blue dye photodegradation

Cited by 28 publications

References 56 publications

Recent Progress on Carbon Quantum Dots Based Photocatalysis

Recent Progress on Carbon Quantum Dots Based Photocatalysis

Effect of synthesized carbon quantum dots on the photocatalytic properties of ZnO

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