Transformation of ZnO polycrystalline sheets into hexagon-like mesocrystalline ZnO rods (tubes) under ultrasonic vibration

Ding, Jianning; Fang, Xiang; Yang, Rong; Kan, Biao; Li, Xiazhang; Yuan, Ningyi

doi:10.1186/1556-276x-9-214

Cited by 14 publications

(10 citation statements)

References 34 publications

(18 reference statements)

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“…2 c, ultrasonic mediated synthesis results in the transformation of spherical ZnO NPs to the hexagonal structure. A similar modification of ZnO nanosheets to the hexagonal ZnO nanorods also has been reported in the same sonication-based synthesis strategy 33 . As shown in Fig.…”

Section: Resultssupporting

confidence: 68%

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Malekkiani

Magham

Ravari

et al. 2022

Sci Rep

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Developing a cheap, stable and effective photocatalyst is necessary for remediation of persistent organic pollutants. To address this challenge, we proposed a unique interfacial engineering technique and proper bandgap matching strategy to synthesize MWCNTs/ZnO/Chitosan ternary nanocomposite for effective photocatalytic application. The features of the prepared samples were determined by FESEM, TEM, EDX, elemental mapping, AFM, FT-IR, XRD, UV–Vis spectroscopy and BET surface analysis. The obtained results showed successful fabrication of synthesized nanocomposites with enhanced surface area. Degradation effect of nanostructures on methylene blue (MB) and antibacterial activity against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis) pathogenic strains were investigated. The proposed photocatalytic mechanism illustrated the electron transfer facilitated by MWCNTs/ZnO/Chitosan structure which results in spatial separation of electron–hole pairs. Compared with ZnO and ZnO/Chitosan, the prepared MWCNTs/ZnO/Chitosan ternary nanocomposite showed high usage of UV illumination and superior separation of photogenerated electron–hole pairs. MWCNTs/ZnO/Chitosan illustrated 86.26% adsorption rate and outstanding increased photocatalytic activity on MB degradation efficiency of 98.76% after 20 min. Stability of photocatalyst reached from 98.76% initial decolorization to 85% at the fourth cycle. In addition, the ternary nanocomposite also exhibited remarkable bactericidal activity against gram-positive (S. aureus) and (B. subtilis) and gram-negative (E. coli) bacteria strains. Due to the obtained results, the prepared nanocomposite would be an efficient candidate photocatalyst with antibacterial properties.

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Section: Resultssupporting

confidence: 68%

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Malekkiani

Magham

Ravari

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…1c, ultrasonic mediated synthesis results in the transformation of spherical ZnO NPs to the hexagonal structure. A similar modi cation of ZnO nanosheets to the hexagonal ZnO nanorods also has been reported in the same sonication-based synthesis strategy 22 . As shown in Fig.…”

Section: Morphology and Structural Characteristics Of Prepared Nanostructuressupporting

confidence: 69%

One Pot Synthesis of Ternary MWCNTs/ZnO/Chitosan Nanocomposite for Enhanced Photocatalytic Degradation of Organic Dyes and Antibacterial Activity

Malekkiani

Magham

Ravari

et al. 2021

Preprint

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Developing a cheap, stable and effective photocatalyst is necessary for remediation of persistent organic pollutants. To address this challenge, we proposed a unique interfacial engineering technique and proper bandgap matching strategy to synthesize MWCNTs/ZnO/Chitosan ternary nanocomposite for effective photocatalytic application. The features of the prepared samples were determined by FESEM, TEM, EDX, elemental mapping, AFM, FT-IR, XRD, UV-Vis spectroscopy and BET surface analysis. The obtained results showed successful fabrication of synthesized nanocomposites. Degradation effect of nanostructures on methylene blue (MB) and antibacterial activity against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis) pathogenic strains were investigated. The proposed photocatalytic mechanism illustrated the electron transfer facilitated by MWCNTs/ZnO/Chitosan structure which results in spatial separation of electron-hole pairs. Compared with ZnO and ZnO/Chitosan, the prepared MWCNTs/ZnO/Chitosan ternary nanocomposite showed high usage of UV illumination and superior separation of photogenerated electron-hole pairs. MWCNTs/ZnO/Chitosan illustrated outstanding increased photocatalytic activity on MB degradation efficiency of 98.76% after 20 mins. In addition, the ternary nanocomposite also exhibited remarkable bactericidal activity against gram-positive (S. aureus) and (B. subtilis) and gram-negative (E. coli) bacteria strains. Due to the obtained results, the prepared nanocomposite would be an efficient candidate photocatalyst with antibacterial properties.

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“…In the last decade, ZnO with various morphologies, including flower-like [6,7], nanodisc [1], nanobelt [8], and nanotube [9], targeting various application areas, have been investigated using different synthesis methods, e.g., sol-gel [10], hydrothermal [11], the microwave-assisted method [12] and spray pyrolysis [13]. Kajbafvala et al reported synthesis of spherical and flower-like ZnO via the microwave-assisted method for organic dye photo-degradation via UV lamp irradiation.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Morphology of ZnO Nanostructures with the Ultrasonic Spray Pyrolysis Process

Emil

Alkan

Gürmen

et al. 2018

Metals

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Nanostructured zinc oxide (ZnO) particles were synthesized by the one step Ultrasonic Spray Pyrolysis (USP) process from nitrate salt solution (Zn(NO 3 ) 2 ·6H 2 O). Various influential parameters, from Zn(NO 3 ) 2 ·6H 2 O concentrations (0.01875-0.0375 M) in the initial solution, carrier gas (N 2 ) flow rates (0.5-0.75 L/min) to reaction temperature (400-800 • C), were tested to investigate their role on the final ZnO particles' morphology. For this purpose, Scanning Electron Microscopy (SEM), High Resolution Transmission Electron Microscopy (HRTEM) and (Selected Area Electron Diffraction) SAED techniques were used to gain insight into how the ZnO morphology is dependent on the USP process. It was revealed that, by certain parameter selection, different ZnO morphology could be achieved, from spherical to sphere-like structures assembled by interwoven nanoplate and nanoplate ZnO particles. Further, a more detailed crystallographic investigation was performed by XRD and Williamson-Hall (W-H) analysis on the ZnO with unique and non-typical planar morphology that was not reported before by USP synthesis. Moreover, for the first time, a flexible USP formation model was proposed, ending up in various ZnO morphologies rather than only ideal spheres, which is highly promising to target a wide application area.

show abstract

Transformation of ZnO polycrystalline sheets into hexagon-like mesocrystalline ZnO rods (tubes) under ultrasonic vibration

Cited by 14 publications

References 34 publications

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

Facile fabrication of ternary MWCNTs/ZnO/Chitosan nanocomposite for enhanced photocatalytic degradation of methylene blue and antibacterial activity

One Pot Synthesis of Ternary MWCNTs/ZnO/Chitosan Nanocomposite for Enhanced Photocatalytic Degradation of Organic Dyes and Antibacterial Activity

Tuning the Morphology of ZnO Nanostructures with the Ultrasonic Spray Pyrolysis Process

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