Ethylene glycol-assisted solvothermal fabrication of ZnWO4 nanostructures with tunable size, optical properties, and photocatalytic activities

Zhou, Yubing; Tong, Ling; Chen, Xiaobing; Zeng, Xianghua

doi:10.1007/s00339-014-8721-8

Cited by 12 publications

(1 citation statement)

References 41 publications

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“…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%

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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