High piezo–catalytic activity of ZnO/Al2O3 nanosheets utilizing ultrasonic energy for wastewater treatment

Nie, Qing; Xie, Yafan; Ma, Jiami; Wang, Jinlong; Zhang, Gaoke

doi:10.1016/j.jclepro.2019.118532

Cited by 108 publications

(29 citation statements)

References 48 publications

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“…Under ultrasonic vibrations, piezoelectric nanomaterials are able to produce hydrogen from water, and degrade organic dyes very quickly. While for piezocatalysis driven by magnetic stirring, only very slow dye degradations have been reported for some piezoelectric nanomaterials up to date [13][14][15][16].…”

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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“…High photocatalytic activity of ZnO and TiO 2 nanostructures have led to applications such as the degradation of water pollutant dyes such as rhodamine B, [ 247,248 ] methyl orange (MO), [ 249–251 ] methylene blue [ 240,246 ] and Congo red [ 242,252 ] and self‐cleaning fabrics. [ 253,254 ]…”

Section: Photocatalysis Related Applications In Uv Sensingmentioning

confidence: 99%

UV Photochromism in Transition Metal Oxides and Hybrid Materials

Kayani

Kuriakose

Monshipouri

et al. 2021

Small

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Limited levels of UV exposure can be beneficial to the human body. However, the UV radiation present in the atmosphere can be damaging if levels of exposure exceed safe limits which depend on the individual the skin color. Hence, UV photochromic materials that respond to UV light by changing their color are powerful tools to sense radiation safety limits. Photochromic materials comprise either organic materials, inorganic transition metal oxides, or a hybrid combination of both. The photochromic behavior largely relies on charge transfer mechanisms and electronic band structures. These factors can be influenced by the structure and morphology, fabrication, composition, hybridization, and preparation of the photochromic materials, among others. Significant challenges are involved in realizing rapid photochromic change, which is repeatable, reversible with low fatigue, and behaving according to the desired application requirements. These challenges also relate to finding the right synergy between the photochromic materials used, the environment it is being used for, and the objectives that need to be achieved. In this review, the principles and applications of photochromic processes for transition metal oxides and hybrid materials, photocatalytic applications, and the outlook in the context of commercialized sensors in this field are presented.

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“…The X-ray diffraction pattern of the synthesized Ba 2 TiMnO 6 (BTMO) nanosheets is depicted in fig.1 (a), revealing that BTMO exhibits a 12R structure with high-intensity peaks, denoting the highly crystalline nature of BTMO sample 16,15 . According to the Structure Prediction 6 of the element is decorated in the EDX spectra, depicted in fig.3 (b) 13,25 . Transmission electron microscopy (TEM) photographs are shown in fig.…”

Section: Structural and Morphological Characterization Of Ba 2 Timno mentioning

confidence: 99%

“…Nevertheless, when a piezoelectric material is exposed to tension by pressing or pulling, the atoms are shifted from their initial 4 state to achieve a net electrical charge in the entire crystal, and thus there are both negative and positive charges on the inner and outer sides of the crystal 11,12 . In a standard piezocatalytic phase, the piezoelectric crystal produces an electric field in response to mechanical stress that can move free load-carriers that engage in redox reactions 13 . Developed free carriers must have an elevated potential than normal redox potential for every redox reaction, i.e., greater than 1.23 eV in the instance of water splitting.…”

Section: Introductionmentioning

confidence: 99%