Enhanced charge transfer and separation of hierarchical CuO/ZnO composites: The synergistic effect of photocatalysis for the mineralization of organic pollutant in water

Bharathi, P.; Harish, S.; Archana, J.; Navaneethan, M.; Ponnusamy, S.; Muthamizhchelvan, C.; Shimomura, Masaru; Hayakawa, Y.

doi:10.1016/j.apsusc.2019.03.131

Cited by 97 publications

(37 citation statements)

References 45 publications

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“…In a semiconductor, the lowest occupied and the highest unoccupied energy bands are separated by a bandgap ( E g ) 72 . The E g specifies the light wavelength for photocatalyst materials, which may be absorbed quickly to generate electron‐hole pairs with the ability to react with water molecules, oxygen molecules, and hydroxide ions in order to generate hydroxyl radicals (

{OH}^{\cdot}

) and superoxide radical anions (

O_{2}^{\cdot ‐}

) 73‐75 . Equations ()–() describe this process, as shown in Figure 11.…”

Section: Resultsmentioning

confidence: 99%

“…72 The E g specifies the light wavelength for photocatalyst materials, which may be absorbed quickly to generate electron-hole pairs with the ability to react with water molecules, oxygen molecules, and hydroxide ions in order to generate hydroxyl radicals (OH ⋅ ) and superoxide radical anions (O ⋅ − 2 ). [73][74][75] Equations ( 14)-( 17) describe this process, as shown in Figure 11. When solar energy (photons) that irradiated on the surface of semiconductor photocatalysts carries a photon energy greater than or equal to their E g , the electrons in the valence band (VB) are stimulated and reach their conduction band (CB) in femtoseconds, leaving behind the holes in the valence band.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

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Photocatalytic performance of Fe‐substituted ZnAl₂O₄ powders under sunlight irradiation on degradation of industrial dyes

Tangcharoen

T‐Thienprasert

Kongmark

2021

Int J Applied Ceramic Tech

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Using the sol-gel auto combustion method with diethanolamine (DEA) as fuel, a sequence of iron-substituted zinc aluminates, ZnFe x Al 2-x O 4 powders, including variable Fe 3+ ion concentrations (0 ≤ x ≤ 2) were effectively prepared. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), the Brunauer-Emmett-Teller (BET) method, UV-visible diffuse reflectance spectroscopy (UV-DRS), and vibrating sample magnetometer (VSM) were

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{OH}^{\cdot}

) and superoxide radical anions (

O_{2}^{\cdot ‐}

) 73‐75 . Equations ()–() describe this process, as shown in Figure 11.…”

Section: Resultsmentioning

confidence: 99%

Section: Photocatalytic Activitymentioning

confidence: 99%

Photocatalytic performance of Fe‐substituted ZnAl₂O₄ powders under sunlight irradiation on degradation of industrial dyes

Tangcharoen

T‐Thienprasert

Kongmark

2021

Int J Applied Ceramic Tech

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“…The Eg specifies the light wavelength for photocatalyst materials, which may be absorbed quickly to generate electron-hole pairs with the ability to react with water molecules, oxygen molecules, and hydroxide ions in order to generate hydroxyl radicals (OH˙) and superoxide radical anions ( 2 O  ) [57,58]. A schematic illustration of this procedure is given in Figure 11.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Synthesis and characterization of magnetic recyclable Fe-substituted zinc aluminate photocatalysts with enhanced sunlight-driven degradation of industrial dyes

Tangcharoen¹,

T‐Thienprasert²,

Kongmark³

2020

Preprint

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Using the sol-gel auto combustion approach with diethanolamine (DEA) as fuel, a sequence of iron-substituted zinc aluminates, ZnFexAl2−xO4 powders, including variable Fe3+ ion concentrations (0 ≤ x ≤ 2) were effectively created. XRD, FT-IR, SEM, EDS, BET, UV-DRS, and VSM were employed to examine the structures, chemical bonds, morphologies, composition, surface area, and optical properties as well as the magnetic behavior of the collected samples. A single-phase spinel structure was gained for the calcined aluminate powders with different interplanar spacing and crystallite sizes, as revealed by the classification results. The bandgap energy (Eg) of adapted aluminates was in the range of 2.08–3.14 eV, identified as being much lower compared to the pure sample (5.60 eV). Thus, Fe3+-substituted ZnAl2O4 samples could be successfully photoexcited using both ultraviolet and visible light, as suggested by the results. Examination of how the four main pollutant types decay when irradiated by sunlight was carried out to assess the samples and establish photocatalytic activity. These contaminants included phenol rhodamine B (RhB), heteropolyaromatic methylene blue (MB), azoic methyl orange (MO) and methyl red (MR). The performance of photocatalytic degradation reached 98% after 150 minutes for all optimal samples of organic dyes. Besides, each of the altered photocatalysts could be recycled and displayed high stability. The S-shaped curve of ferrimagnetism can result from in those samples as found by the magnetic measurements, though pure ZnAl2O4 displays diamagnetic characteristics. The adapted samples show intense improvement in the remanent magnetization (Mr) when compared to pure ZnAl2O4, signifying that magnetic photocatalyst recovery by applying an external magnetic field is easy. Thus, these results offer a convincing sign that ZnAl2O4 powders replaced by Fe3+ could provide the ability to aid in the ecologically-friendly collection of solar energy.

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“…Nanoscale CuO has been widely studied owing to its increased surface defects and higher specific surface area compared with its bulk counterpart [11,12]. However, the agglomeration of nanoscale CuO results from the high surface energy and the quick recombination of the photoinduced charge carriers and restricts the photocatalytic activity [13,14]. At present, the construction of CuO-based heterostructures (e.g., 0D/2D CuO/TiO 2 , 0D/3D CuO/ZnO, 2D/2D CuO/Fe 2 O 3 , 0D/2D CuO/C 3 N 4 , 2D/0D CuO/Ag 3 PO 4 ) [6,12,[15][16][17] and the dispersion of CuO on supporting materials (e.g., graphene, carbon nanotube) [7,18] are considered to be the most effective ways to address these problems.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and enhanced photocatalytic performance of 0D/2D CuO/tourmaline composite photocatalysts

Yu¹,

Wen²,

Tong³

et al. 2020

Beilstein J. Nanotechnol.

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Photocatalysis is considered to be a green and promising technology for transforming organic contaminants into nontoxic products. In this work, a CuO/tourmaline composite with zero-dimensional/two-dimensional (0D/2D) CuO architecture was successfully obtained via a facile hydrothermal process, and its photocatalytic activity was evaluated by the degradation of methylene blue (MB). Surface element valence state and molecular vibration characterization revealed that CuO chemically interacted with tourmaline via Si–O–Cu bonds. The specific surface area of the CuO/tourmaline composite (23.60 m2 g−1) was larger than that of the pristine CuO sample (3.41 m2 g−1). The CuO/tourmaline composite exhibited excellent photocatalytic activity for the degradation of MB, which was ascribed to the increase in the quantity of the adsorption-photoreactive sites and the efficient utilization of the photoinduced charge carriers. This study provides a facile strategy for the construction of 0D/2D CuO structures and the design of tourmaline-based functional composite photocatalysts for the treatment of organic contaminants in water.

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Enhanced charge transfer and separation of hierarchical CuO/ZnO composites: The synergistic effect of photocatalysis for the mineralization of organic pollutant in water

Cited by 97 publications

References 45 publications

Photocatalytic performance of Fe‐substituted ZnAl₂O₄ powders under sunlight irradiation on degradation of industrial dyes

Photocatalytic performance of Fe‐substituted ZnAl₂O₄ powders under sunlight irradiation on degradation of industrial dyes

Synthesis and characterization of magnetic recyclable Fe-substituted zinc aluminate photocatalysts with enhanced sunlight-driven degradation of industrial dyes

Synthesis and enhanced photocatalytic performance of 0D/2D CuO/tourmaline composite photocatalysts

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Enhanced charge transfer and separation of hierarchical CuO/ZnO composites: The synergistic effect of photocatalysis for the mineralization of organic pollutant in water

Cited by 97 publications

References 45 publications

Photocatalytic performance of Fe‐substituted ZnAl2O4 powders under sunlight irradiation on degradation of industrial dyes

Photocatalytic performance of Fe‐substituted ZnAl2O4 powders under sunlight irradiation on degradation of industrial dyes

Synthesis and characterization of magnetic recyclable Fe-substituted zinc aluminate photocatalysts with enhanced sunlight-driven degradation of industrial dyes

Synthesis and enhanced photocatalytic performance of 0D/2D CuO/tourmaline composite photocatalysts

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Product

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Photocatalytic performance of Fe‐substituted ZnAl₂O₄ powders under sunlight irradiation on degradation of industrial dyes

Photocatalytic performance of Fe‐substituted ZnAl₂O₄ powders under sunlight irradiation on degradation of industrial dyes