Synthesis and Enhanced Photocatalytic Activity of Er$lt;sup$gt;3+$lt;/sup$gt;-doped ZnWO$lt;inf$gt;4$lt;/inf$gt;

Yu, Zhou; Zhang, Zhijie; Jia-Yue, XU; Chu, Yaoqing; You, Mingjiang

doi:10.15541/jim20140574

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…Doping with Eu 2+ and Eu 3+ ions is another factor enhancing the photocatalytic activity of Eu-doped ZnWO 4 nanoplates. Positive effects of doping on the photocatalytic activity of ZnWO 4 nanostructures were also reported, examples include non-metal ions (B, C, N, F) doping [24,25,26], transition metal ions doping (Sn 2+ , Cr 3+ , Mn 2+ , and Cu 2+ ) [27,28], and rare-earth metal ions doping (Dy 3+ and Er 3+ ) [29,30]. Here, a cooperative mechanism involving both doping and surface area is believed to account for the higher photocatalytic activity of Eu-doped ZnWO 4 nanoplates.…”

Section: Resultsmentioning

confidence: 99%

“…Among these applications, the photocatalytic properties of ZnWO 4 nanostructures have been intensively investigated in order to solve one of the most serious environmental problems in our modern society via semiconductor-based photocatalytic degradation of organic contaminants in water under sunlight [6,7,8,9,10,11]. Up to date, a diverse range of strategies has been developed to enhance the photocatalytic activity of ZnWO 4 nanostructures, which can be classified into three categories: (i) synthesis of ZnWO 4 nanorods and nanosheets with large specific surface area [19]; (ii) coupling ZnWO 4 with other semiconductors and metals such as In 2 S 3 [20], Ag [21], ZnO [22], and Cu 2 O [23]; and (iii) defect engineering ZnWO 4 via doping with non-metal ions (B, C, N, F) [24,25,26], transition metal ions (Sn 2+ , Cr 3+ , Mn 2+ , Cu 2+ ) [27,28], and lanthanide ions (Dy 3+ , Er 3+ ) [29,30]. Interestingly, the defect engineering is found to be able to significantly enhance the photocatalytic performances of ZnWO 4 nanostructures.…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, the defect engineering is found to be able to significantly enhance the photocatalytic performances of ZnWO 4 nanostructures. For example, Phuruangrat et al reported that the activity of Dy 3+ doped ZnWO 4 nanorods (3 mol %) was 1.5 times of that of undoped ZnWO 4 [29]; Zhou et al observed the enhanced photocatalytic activity of Er 3+ doped ZnWO 4 nanorods [30]. …”

Section: Introductionmentioning

confidence: 99%

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Eu2+ and Eu3+ Doubly Doped ZnWO4 Nanoplates with Superior Photocatalytic Performance for Dye Degradation

Huang

Yang

et al. 2018

Nanomaterials

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Eu2+ and Eu3+ doubly doped ZnWO4 nanoplates with highly exposed {100} facets were synthesized via a facile hydrothermal route in the presence of surfactant cetyltrimethyl ammonium bromide. These ZnWO4 nanoplates were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrometry, diffuse UV-vis reflectance spectroscopy, photoluminescence spectrophotometry, and photoluminescence lifetime spectroscopy to determine their morphological, structural, chemical, and optical characteristics. It is found that Eu-doped ZnWO4 nanoplates exhibit superior photo-oxidative capability to completely mineralize the methyl orange into CO2 and H2O, whereas undoped ZnWO4 nanoparticles can only cleave the organic molecules into fragments. The superior photocatalytic performance of Eu-doped ZnWO4 nanoplates can be attributed to the cooperative effects of crystal facet engineering and defect engineering. This is a valuable report on crystal facet engineering in combination with defect engineering for the development of highly efficient photocatalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eu2+ and Eu3+ Doubly Doped ZnWO4 Nanoplates with Superior Photocatalytic Performance for Dye Degradation

Huang

Yang

et al. 2018

Nanomaterials

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“…Zinc Tungstate ZnWO 4 (ZWO), an important member of Tungstates, is recently shown to be photocatalytical active under UV irradiation, suf cient chemical stability and environmentally friendly 2,3) . However, its photocatalytic ef ciency is restricted by the fast recombination rate of photogenerated electron-hole pairs 4) . Moreover, ZWO presents relatively low photocatalytic ef ciency under visible light due to its large band gap energy 5) .…”

Section: Introductionmentioning

confidence: 99%

Influence of Fluorine on Structure, Morphology, Optical and Photocatalytic Properties of ZnWO<sub>4</sub> Nanostructures

et al. 2017

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We report on the synthesis of Fluorine (F) doped-ZnWO 4 photocatalysts and the in uence of F-doping on their structure, morphology, optical and photocatalytic properties. A two-step process was used to produce F-doped ZnWO 4 photocatalysts. The quality of synthesized materials was characterized using different analytical methods, such as X-ray diffraction analysis, eld emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectra (FTIR), as well as photoluminescence (PL) measurement. It was found that the photocatalyst morphology and band gap energy strongly depend on the F-doping concentration. The band gap energy of the photocatalysts decreased when increasing F-doping concentration, and reached a lowest value at a concentration of 4 mol%, and then increased thereafter. At 4 mol% of F-doping, nanowires were formed with approximately 1 μm in length and 50 nm in diameter. On the contrary, others F-doped ZnWO 4 samples were obtained in the shape of nanorods or a mixture of nanorods and granular particles. Moreover, it was demonstrated that F-doped ZnWO 4 enhanced photocatalytic activity by a factor of three, as compared to that of un-doped ZnWO 4. This enhancement can be explained by the nanowire shape of synthesized F-doped ZnWO 4 , its narrow band gap energy and the small recombination rate of photogenerated electron-hole pairs, which was indirectly proved by PL spectra.

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Synthesis of ZnWO4 Electrode with tailored facets: Deactivating the Microorganisms through Photoelectrocatalytic methods

Zhan

Zhou

Huang

et al. 2017

Applied Surface Science

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The exotic invasive species from the ballast water in the ship will bring about serious damages to ecosystem. Photocatalyst films have been widely studied for sterilization. In this study, ZnWO 4 with different exposed facets was synthesized by hydrothermal method, and ZnWO 4 film electrodes have been applied in ballast water treatment through the electro-assisted photocatalytic system. Then the samples were investigated by X-ray diffraction (XRD), X-ray photo-electron spectroscopy (XPS), Field emission on scanning electron microcopy (FE-SEM), Transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (DRS), BET specific surface area analysis, Fourier transform infrared (FT-IR) and Electrochemical impedance spectra (EIS). ZnWO 4 with an appropriate exposure of (0 1 1) facets ratio exhibited the best photocatalytic and photoelectrocatalytic activities. The microorganisms deactivated completely in 10 min by ZnWO 4 films with 3 V bias. The mechanisms of (0 1 1) facets enhanced the photocatalytic and photoelectrocatalytic activities which were deduced based on the calculated result from the first principles. Simultaneously, appropriate exposed facets and applied bias could reduce the recombination of the photogenerated electron-hole pairs, and improve the photocatalytic activities of ZnWO 4 .

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Synthesis and Enhanced Photocatalytic Activity of Er$lt;sup$gt;3+$lt;/sup$gt;-doped ZnWO$lt;inf$gt;4$lt;/inf$gt;

Cited by 4 publications

References 27 publications

Eu2+ and Eu3+ Doubly Doped ZnWO4 Nanoplates with Superior Photocatalytic Performance for Dye Degradation

Eu2+ and Eu3+ Doubly Doped ZnWO4 Nanoplates with Superior Photocatalytic Performance for Dye Degradation

Influence of Fluorine on Structure, Morphology, Optical and Photocatalytic Properties of ZnWO<sub>4</sub> Nanostructures

Synthesis of ZnWO4 Electrode with tailored facets: Deactivating the Microorganisms through Photoelectrocatalytic methods

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