Polyoxometalate-assisted electrochemical deposition of hollow ZnO nanospheres and their photocatalytic properties

Li, Qiuyu; Wang, Chunlei; Ju, Mingliang; Chen, Weilin; Wang, Enbo

doi:10.1016/j.micromeso.2010.09.014

Cited by 26 publications

(12 citation statements)

References 59 publications

(62 reference statements)

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“…Li et al [ 189 ] also studied the photocatalytic properties of ZnO. ZnO nanospheres were obtained using an electrochemical method, in the presence of POMs (polyoxometalates), at room temperature.…”

Section: Applications Of Zinc Oxidementioning

confidence: 99%

Zinc Oxide—From Synthesis to Application: A Review

Kołodziejczak-Radzimska

2014

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Zinc oxide can be called a multifunctional material thanks to its unique physical and chemical properties. The first part of this paper presents the most important methods of preparation of ZnO divided into metallurgical and chemical methods. The mechanochemical process, controlled precipitation, sol-gel method, solvothermal and hydrothermal method, method using emulsion and microemulsion enviroment and other methods of obtaining zinc oxide were classified as chemical methods. In the next part of this review, the modification methods of ZnO were characterized. The modification with organic (carboxylic acid, silanes) and inroganic (metal oxides) compounds, and polymer matrices were mainly described. Finally, we present possible applications in various branches of industry: rubber, pharmaceutical, cosmetics, textile, electronic and electrotechnology, photocatalysis were introduced. This review provides useful information for specialist dealings with zinc oxide.

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Section: Applications Of Zinc Oxidementioning

confidence: 99%

Zinc Oxide—From Synthesis to Application: A Review

Kołodziejczak-Radzimska

2014

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“…[28,29] H 4 SiW 12 O 40 with mixed metal oxide containing zinc was used for the degradation of pesticides and ZnO fabricated in a one-step H 3 PW 12 O 40 assisted electrochemical method was tested for photocatalytic activity. [30,31] Self-assembly of TiO 2 particles with H 3 PW 12 O 40 and further metal nanoparticles has led to an interesting photocatalytic system. [32,33] Yet, none of these studies uses the potential of the composite catalyst structure to develop selective photocatalysts based on ZnO, allowing for a purposeful photocatalysis realized by complex target-designed systems.…”

Section: Introductionmentioning

confidence: 99%

Tunable Photocatalytic Activity of PEO‐Stabilized ZnO–Polyoxometalate Nanostructures in Aqueous Solution

Bernhardt

Düring

Haschke

et al. 2021

Adv Materials Inter

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photocatalysis is of great potential for targeted applications.Due to their unique chemical, electrical, magnetic, mechanical, and optical properties and their catalytic activity, zinc oxide (ZnO) and especially ZnO nanoparticles have received considerable attention in both application fields, solar energy conversion, and catalysis. ZnO is an n-type semiconductor with a wide energy band (3.37 eV) and a high bond energy (60 meV). [1,2] It offers a wide range of properties depending on morphology, size, orientation, and density of the crystals. [3] A good electron mobility, a large volume to surface area ratio, a high UV absorption, and a long life-span are advantageous when used as a photocatalyst in UV-light. [4] The catalytic activity in different model reactions has been examined in dependence on morphology, size and shape, and pH. [3,[5][6][7] As the ZnO properties depend on the structure, numerous nanoparticle synthesis routes have been developed to create different shapes of ZnO structures such as 1D, 2D, and 3D structures including nanorods, nanoneedles, and nanoflowers. [8][9][10][11] A powerful technique to control the morphology is the use of surface-modifying substances, in particular macromole cules. [1] A number of studies have investigated various polymers such as polymethacrylic acid, polyethylene oxide (PEO) and PEO containing copolymers. [11][12][13][14][15] The application of polyethylene oxide-block-polymethacrylic acid (PEO-b-PMAA) copolymers as surface modifiers for ZnO has been thoroughly examined. [16] The photocatalytic activity and selectivity of novel binary and ternary composite nanostructures from polyethylene oxide-stabilized zinc oxide (PEO-ZnO) with and without polyoxometalate (H 4 [Si(W 3 O 10 ) 4 ], POM) are determined in aqueous solution under UV-light. Mono-and di-COOH-end-functionalized PEO polymers are used as surface modifiers, influencing the morphology and stability of the ZnO nanoparticles being synthesized in water. POM acts as an additional versatile photocatalytically active building block resulting in a ternary hybrid structure with tunable photocatalytic activity. Catalytic selectivity is demonstrated by studying photocatalytic dye degradations as model reactions, where the chemical backbone of the dyes and their charge turn out to be the basis for the selectivity. All samples are characterized with dynamic light scattering, transmission electron microscopy, scanning electron microscopy, light microscopy, and ζ-potential measurements. With the functionalized PEOs, large ZnO clusters consisting of leaves are formed while 2-[2-(2-methoxyethoxy) ethoxy] acetic acid (TODA) yields ZnO flower-like structures.

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“…During the formation of ZnS hollow microspheres, there was no hard template for the hollow structure. The main driving force leading to formation of ZnS hollow microspheres was probably ascribed to the Ostwald ripening effect, which was applied in fabrication of hierarchical structure such as CuO,14 ZnS,15 WO 3 /TiO 2 ,16 and Cu 2 O 17. The Ostwald ripening involves “the growth of larger crystals from those of smaller size, which have a larger solubility than the larger ones”.…”

Section: Resultsmentioning

confidence: 99%

dl‐Aspartic Acid‐Mediated Hydrothermal Synthesis of β‐ZnS Microspheres and Their Optical Properties

Zhang

Pan

et al. 2011

Zeitschrift anorg allge chemie

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ZnS hollow microspheres were synthesized by a dl-aspartic acid mediated hydrothermal route. dl-aspartic acid plays an important role as crystal growth soft template, which regulates the release of Zn 2+ ions for the formation of ZnS hollow spheres. The formation of these hollow spheres was mainly attributed to an Ostwald ripening process. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), electron diffraction (ED), UV/Vis spectroscopy (UV),

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Polyoxometalate-assisted electrochemical deposition of hollow ZnO nanospheres and their photocatalytic properties

Cited by 26 publications

References 59 publications

Zinc Oxide—From Synthesis to Application: A Review

Zinc Oxide—From Synthesis to Application: A Review

Tunable Photocatalytic Activity of PEO‐Stabilized ZnO–Polyoxometalate Nanostructures in Aqueous Solution

dl‐Aspartic Acid‐Mediated Hydrothermal Synthesis of β‐ZnS Microspheres and Their Optical Properties

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