Effect of Bi2WO6 nanosheets on the ultrasonic degradation of organic dyes: Roles of adsorption and piezocatalysis

Kang, Zihan; Qin, Ni; Lin, Enzhu; Wu, Jiang; Yuan, Baowei; Bao, Dinghua

doi:10.1016/j.jclepro.2020.121125

Cited by 124 publications

(37 citation statements)

References 60 publications

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“…In recent years, there has been a growing interest in utilizing mechanical energy as a clean energy for more applications. For instance, piezoelectric nanomaterials, especially those of one-and two-dimensions, undergo considerable deformation under vibrations with piezopotentials generated across them [1], which subsequently induce such redox reactions as degradation of organic pollutants [2][3][4][5][6] and hydrogen production [7][8][9]. A technology known as piezocatalysis has thus emerged, which aims to harvest mechanical energy in ambient environments through piezoelectric nanomaterials for chemical reactions and has been extensively investigated [10,11].…”

Section: Introductionmentioning

confidence: 99%

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water

Tang

Xiao

et al. 2021

Friction

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The friction between nanomaterials and Teflon magnetic stirring rods has recently drawn much attention for its role in dye degradation by magnetic stirring in dark. Presently the friction between TiO2 nanoparticles and magnetic stirring rods in water has been deliberately enhanced and explored. As much as 1.00 g TiO2 nanoparticles were dispersed in 50 mL water in 100 mL quartz glass reactor, which got gas-closed with about 50 mL air and a Teflon magnetic stirring rod in it. The suspension in the reactor was magnetically stirred in dark. Flammable gases of 22.00 ppm CO, 2.45 ppm CH4, and 0.75 ppm H2 were surprisingly observed after 50 h of magnetic stirring. For reference, only 1.78 ppm CO, 2.17 ppm CH4, and 0.33 ppm H2 were obtained after the same time of magnetic stirring without TiO2 nanoparticles. Four magnetic stirring rods were simultaneously employed to further enhance the stirring, and as much as 30.04 ppm CO, 2.61 ppm CH4, and 8.98 ppm H2 were produced after 50 h of magnetic stirring. A mechanism for the catalytic role of TiO2 nanoparticles in producing the flammable gases is established, in which mechanical energy is absorbed through friction by TiO2 nanoparticles and converted into chemical energy for the reduction of CO2 and H2O. This finding clearly demonstrates a great potential for nanostructured semiconductors to utilize mechanical energy through friction for the production of flammable gases.

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Section: Introductionmentioning

confidence: 99%

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water

Tang

Xiao

et al. 2021

Friction

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“…The pristine BWO was synthesized via a hydrothermal process. [ 9 ] Typically, 2 mmol Bi (NO 3 ) 3 · 5H 2 O, 1 mmol Na 2 WO 4 · 2H 2 O, and 0.05 g Cetyltrimethylammonium bromide were dissolved into 80 mL deionized water under magnetic stirring for 30 min. Then transferring the suspension to a 100 mL Teflon‐lined stainless steel autoclave and heated at 120 °C for 24 h. The products were collected and washed with deionized water and ethanol, then dried at 60 °C.…”

Section: Methodsmentioning

confidence: 99%

“…At the same time, the large specific surface area and abundant crystal edges of the ultrathin BWO nanostructures provide a large number of active sites for its piezoelectric catalytic reactions. [ 9 ] For instance, there has been much excellent experimental work to prove that the piezoelectric responses of BWO will realize the conversion from mechanical energy to chemical energy. [ 10–12 ] Moreover, the piezoelectric effect can provide driving force to the catalyst in the photocatalytic process and effectively improve the photocatalysis behavior, for example, enhance the degradation efficiency of dyes.…”

Section: Introductionmentioning

confidence: 99%

Construction of GQDs‐Decorated Ultrathin Bi₂WO₆ Nanosheets Hydrogel: a Recyclable‐Flexible Platform with Excellent Piezo‐Photocatalytic Activity for High‐Performance Water Decontamination and its Theoretical Interpretation

Wei

Gao

et al. 2021

Part & Part Syst Charact

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It is demonstrated that, by using the electronic reconstruction of ultrathin Bi2WO6 (BWO) nanosheets with graphene quantum dots (GQDs) upon a unique process of laser irradiation in liquid (LAL), a kind of GQDs modified BWO nanosheets under metastable state were synthesized, which performed excellent visible‐light piezo‐photocatalytic organics degradation. Furthermore, using commercial cpolyacrylamids (PAM) as the additional materials, a kind of electronic reconstruction GQDs‐BWO nanosheets hydrogel was achieved by dispersed the functionalized powders into a super absorbent polymers (SAPs) system upon in situ polymerization method, which showed that it is a bracing idea to use SAPs for water decontamination reactors to enable full use of vibration energy synergistic with light of nature to driven pollution degradation. First‐principles calculation was also simultanously performed in this study. This study may provide a new enlightenment on fabricating novel 2D nanomaterials hydrogel for efficient effluent purification and potentially other environmental or energy applications.

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“…(4) As a ferroelectric material, the photocatalytic performance of Bi2WO6 can be enhanced by coupling external fields, such as mechanical stress and temperature gradient [244][245][246][247][248]. In addition, the external electric field can also enhance the photocatalytic activity of Bi2WO6.…”

Section: Metal-based Compositesmentioning

confidence: 99%

Recent advances on Bi2WO6-based photocatalysts for environmental and energy applications

Chen

Liu

et al. 2021

Chinese Journal of Catalysis

248

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Bismuth tungstate (Bi2WO6) has become a research hotspot due to its potential in photocatalytic energy conversion and environmental purification. Nevertheless, the limited light absorption and fast recombination of photogenerated carriers hinder the further improvement of the photocatalytic performance of Bi2WO6. Herein, we provide a systematic review for the recent advances on Bi2WO6-based photocatalysts. It starts with the crystal structure, optical properties and photocatalytic fundamentals of Bi2WO6. Then, we focus on the modification strategies of Bi2WO6 based on morphology control, atomic modulation and composite fabrication for diverse photocatalytic applications, such as organic synthesis, water splitting, CO2 reduction, water treatment, air purification, bacterial inactivation, etc. Finally, some current challenges and future development prospects are proposed. We expect that this review can provide a useful reference and guidance for the development of efficient Bi2WO6 photocatalysts.

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Effect of Bi2WO6 nanosheets on the ultrasonic degradation of organic dyes: Roles of adsorption and piezocatalysis

Cited by 124 publications

References 60 publications

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water

Construction of GQDs‐Decorated Ultrathin Bi₂WO₆ Nanosheets Hydrogel: a Recyclable‐Flexible Platform with Excellent Piezo‐Photocatalytic Activity for High‐Performance Water Decontamination and its Theoretical Interpretation

Recent advances on Bi2WO6-based photocatalysts for environmental and energy applications

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Effect of Bi2WO6 nanosheets on the ultrasonic degradation of organic dyes: Roles of adsorption and piezocatalysis

Cited by 124 publications

References 60 publications

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water

Flammable gases produced by TiO2 nanoparticles under magnetic stirring in water

Construction of GQDs‐Decorated Ultrathin Bi2WO6 Nanosheets Hydrogel: a Recyclable‐Flexible Platform with Excellent Piezo‐Photocatalytic Activity for High‐Performance Water Decontamination and its Theoretical Interpretation

Recent advances on Bi2WO6-based photocatalysts for environmental and energy applications

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Product

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Construction of GQDs‐Decorated Ultrathin Bi₂WO₆ Nanosheets Hydrogel: a Recyclable‐Flexible Platform with Excellent Piezo‐Photocatalytic Activity for High‐Performance Water Decontamination and its Theoretical Interpretation