Cubic ZnWO4 nano-photocatalysts synthesized by the microwave-assisted precipitation technique

Amouzegar, Zahra; Naghizadeh, R.; Rezaie, Hamid Reza; Ghahari, Mehdi; Aminzare, M.

doi:10.1016/j.ceramint.2014.09.119

Cited by 46 publications

(9 citation statements)

References 37 publications

(47 reference statements)

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“…As it is well known, the crystallinity, dimensions and morphology of photocatalysts are crucial to improve their catalytic performance [14,15]. Therefore, to enhance the photocatalytic activity of ZnWO4, various methodologies including conventional solid-state reactions, microwave-assisted precipitation, and hydro/solvothermal methods have been adopted to prepare ZnWO4 photocatalysts with different microstructures and tunable properties [10,11,14,[16][17][18][19][20]. For example, ZnWO4 nanoparticles and nanorods were successfully synthesized via kinetic and thermodynamic control processes by hydrothermal method, and it was demonstrated that the perfect crystallinity of ZnWO4 nanorods can enhance the photocatalytic activity [10].…”

Section: Introductionmentioning

confidence: 99%

“…For example, ZnWO4 nanoparticles and nanorods were successfully synthesized via kinetic and thermodynamic control processes by hydrothermal method, and it was demonstrated that the perfect crystallinity of ZnWO4 nanorods can enhance the photocatalytic activity [10]. ZnWO4 with cubic morphology [16], nanocrystals [21], yolk-shell microspheres [20], nanorods with different aspect ratio [22] were also synthesized for photocatalysis application in recent years. The effects of morphology on the photocatalytic activity of ZnWO4 are also discussed in several studies.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Huang

Gao

Zhang

et al. 2016

Applied Catalysis A: General

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Solar-light-driven photocatalysts with porous structure are preferred for gaseous pollutants removal at low concentration levels. In this study, hierarchical porous ZnWO4 microspheres were synthesized by a facile ultrasonic spray pyrolysis method for the first time. The as-prepared ZnWO4 samples were composed of microspheres with diameter ranging from 0.1 to 2 μm and it was revealed that these microspheres are formed by the self-assembly of nanoparticles. The photocatalytic performances of these microspheres were evaluated by the degradation of gaseous NOx under simulated solar light irradiation. It was found that the ZnWO4 batch synthesized at 700 °C exhibited superior photocatalytic activity to those synthesized at 650 °C and 750 °C as well as Degussa TiO2 P25. Both •OH and O2•radicals were found to be the major reactive species involved for NOx degradation as identified by electron spin resonance spectroscopy (ESR) method, which was consistent with the theoretical analysis. The excellent catalytic activity of ZWO-700 was attributed to its special hierarchical porous structure, which facilitated the separation/diffusion of the photogenerated charge carriers and the diffusion of intermediates and final products of NOx oxidation. The photocatalytic NOx removal mechanism over ZnWO4 samples was also proposed. This study suggests that ultrasonic spray pyrolysis is a facile and scalable process to fabricate ZnWO4 porous microspheres which are promising photocatalytic materials for gaseous pollutants purification.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Huang

Gao

Zhang

et al. 2016

Applied Catalysis A: General

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“…The peak at 485 cm −1 is ascribed to the stretching vibrations of BiOI . Furthermore, the vibration modes of ZnWO 4 nanorods at 400–1100 cm −1 can be observed clearly, which can be ascribed to the bending and stretching modes of Zn─O─W bonds (832, 886 cm −1 ), the stretching modes in W─O bonds in (WO 6 ) 2− octahedrons (711 cm −1 ), the symmetric and asymmetric deformation modes of W─O bonds and Zn─O bonds in WO 6 and ZnO 6 octahedral (473, 430 cm −1 ), the symmetrical oxygen bridge in Zn─O─W (532 cm −1 ), and the main stretching bands of Zn─O bond (565 cm −1 ), respectively. In the composite, it can be observed that the signal of ZnWO 4 is stronger than that of BiOI, which is due to the high content of ZnWO 4 in the composite.…”

Section: Resultsmentioning

confidence: 92%

Constructing 1D/2D BiOI/ZnWO₄p‐n heterojunction photocatalyst with enhanced photocatalytic removal of NO

Gong

Zhu

Bello

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Photocatalysis technology based on green renewable solar energy has broad prospects in environmental protection and new energy utilization. The energy of the light can be utilized to convert the pollutants in the environment into non-toxic substances even available products. Due to its low cost and environmental protection, photocatalysis technology has been further developed in the fields of water splitting, sewage treatment and nitrogen oxides (NO x ) removal.RESULTS: In this study, zinc tungstate (ZnWO 4 ) nanorods loaded on bismuth oxyiodide (BiOI) nanosheets with exposed {001} facet forming a 1D/2D BiOI/ZnWO 4 p-n heterojunction photocatalysts were synthesized and their photocatalytic activities for nitric oxide (NO) removal were investigated. The 20% BOI/ZWO composite exhibited the most excellent photocatalytic NO removal performance, which were 32.32% and 48.24% under visible light and simulated sunlight irradiation, respectively. CONCLUSION: A novel 1D/2D BiOI/ZnWO 4 p-n heterojunction was successfully synthesized by a two-step procedure. Compared to the pure ZnWO 4 and BiOI, the 20% BOI/ZWO composite has a significant increase in photocatalytic activity which is attributed to the enhanced visible light absorption and the improved separation of charge carriers. Trapping experiments and electron spin resonance results indicate that the hole (h + ), super oxygen radical (·O 2 − ) and hydroxyl radical (·OH) play minor roles, while the electron (e − ) has a major contribution to the NO removal process. Therefore, the BiOI/ZnWO 4 p-n heterojunction is a promising material for NO removal.

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“…Furthermore, the peaks located at 844 cm -1 and 887 cm -1 are ascribed to the bending and stretching of vibration bands in Zn-W-O [35]. Furthermore, there were two peaks at 1654 cm -1 and 3460 cm -1 which can be attributed to the OH bending vibration band (physically adsorbed water) and stretching vibration band of O-H, respectively [36]. Infrared spectra of the treated sample by argon, nitrogen, and oxygen also showed the absorption bands existing in ZnWO4 structure (Figs.…”

Section: Ft -Ir Studymentioning

confidence: 93%

Non-thermal plasma-assisted growth of ZnWO4 hierarchical nanostructures: morphology, structure and photoactivity

2020

Global NEST: The International Journal

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<p>Zinc tungstate (ZnWO4) photocatalyst was synthesized by precipitation method and treated with different non-thermal plasma to study its morphology, structure and photocatalytic activity. The X-ray diffraction results revealed that the plasma-treated ZnWO4 exhibited only wolframite structure and its crystallinity was preserved. The SEM images of the samples demonstrated that the morphology of ZnWO4 was changed from non-uniform particle to flower and rod-like following plasma treatment. The enhanced photocatalytic activity of the treated ZnWO4 sample may be associated with the enhancement in the particle size reduction and increase of the surface area. Also, charge separation efﬁciency due to well-constructed space charge region along the longitudinal direction of the nano ZnWO4 may be affected the photocatalytic activity.</p>

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Cubic ZnWO4 nano-photocatalysts synthesized by the microwave-assisted precipitation technique

Cited by 46 publications

References 37 publications

Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Constructing 1D/2D BiOI/ZnWO₄p‐n heterojunction photocatalyst with enhanced photocatalytic removal of NO

Non-thermal plasma-assisted growth of ZnWO4 hierarchical nanostructures: morphology, structure and photoactivity

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Cubic ZnWO4 nano-photocatalysts synthesized by the microwave-assisted precipitation technique

Cited by 46 publications

References 37 publications

Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Hierarchical porous ZnWO4 microspheres synthesized by ultrasonic spray pyrolysis: Characterization, mechanistic and photocatalytic NO removal studies

Constructing 1D/2D BiOI/ZnWO4p‐n heterojunction photocatalyst with enhanced photocatalytic removal of NO

Non-thermal plasma-assisted growth of ZnWO4 hierarchical nanostructures: morphology, structure and photoactivity

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Constructing 1D/2D BiOI/ZnWO₄p‐n heterojunction photocatalyst with enhanced photocatalytic removal of NO