Facet enhanced photocatalytic effect with uniform single-crystalline zinc oxide nanodisks

Zeng, Jing; Jin, Bin; Wang, Ye Feng

doi:10.1016/j.cplett.2009.02.082

Cited by 163 publications

(60 citation statements)

References 59 publications

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“…The high costs associated with current technologies of water purification have stimulated efforts to develop effective but also inexpensive technologies for this purpose. Besides well-established techniques such as electrochemical techniques, adsorption, biological treatment and oxidation, photocatalysis is considered to be a 'green' method for water decontamination, as it can lead to fast and complete mineralization of contaminants, without leaving harmful intermediates [1][2][3][4][5][6]. Various heterogeneous photocatalysts offer a means of destroying most organic pollutants present in water at low concentrations.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity for titanium dioxide by co-modification with copper and iron

Zhang

2010

Transition Met Chem

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A copper(II) and iron(III) co-modified titanium dioxide nano material was prepared by a simple sol-gel process using titanium(IV) isopropoxide plus copper(II) and iron(III) nitrates as raw materials. The as-prepared nanocomposites were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy and photoluminescence spectra. The XRD results showed that the undoped TiO 2 nanoparticles mainly include anatase phase while the Cu, Fe-codoped TiO 2 nanoparticles showed a mixture of anatase phase with a small fraction of rutile phase displaying higher activity than the pure anatase phase. Optical characterization showed that the codoping with copper(II) and iron(III) resulted in a red shift of adsorption and lower recombination probability between electrons and holes, which were associated with high photocatalytic activity of the Cu, Fe-codoped TiO 2 nanoparticles under visible light (k [ 400 nm). The photocatalytic activity of the samples was tested by aqueous methyl orange degradation. The capability of the codoped catalyst was much higher than that of the pure TiO 2 catalyst under visible irradiation. A mechanism is proposed in order to account for the enhanced catalytic activity.

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Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity for titanium dioxide by co-modification with copper and iron

Zhang

2010

Transition Met Chem

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“…The exposed crystalline face is noticeably different for ZnO particles with different morphologies: the more specific sites they have, the more their activities become. The unique ZnO nanodisks with high (0001) facet population and small surface area show better photocatalytic activity than other crystalline faces [24,25]. In this work, single-crystalline nature of ZnO and La-doped ZnO nanorods is of preferential growth along the [001] direction.…”

Section: Methodsmentioning

confidence: 93%

“…Photocatalytic activity of the photocatalyst is mainly determined by several factors: morphology, BrunauerEmmett-Teller (BET) surface area, crystalline facet, and dopant [6,16,18,[23][24][25]. Spherical ZnO has higher photocatalytic activity than flower-like ZnO, because it has rather higher specific surface area and pore volume than nanostructured flower shape [23].…”

Section: Methodsmentioning

confidence: 99%

Photocatalytic activity of La-doped ZnO nanostructure materials synthesized by sonochemical method

et al. 2015

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ZnO nanostructure materials doped with different La contents were synthesized by sonochemical method. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR). In this research, XRD patterns of pure ZnO and La-doped ZnO are specified as hexagonal wurtzite ZnO structure with no detection of La 2 O 3 phase. SEM and TEM characterization revealed the flower shape of pure ZnO built-up from petals of hexagonal prisms with hexagonal pyramid tips. Upon doping with La, the flower-shaped ZnO is broken into individual 1D prism-like nanorods. Photocatalytic activities of the as-synthesized products were determined by measuring the degradation of methylene blue (MB) under ultraviolet-visible (UV) light irradiation. Among them, the 2.0 mol% La-doped ZnO shows better photocatalytic properties than any other products.

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“…Similar results were reported by Yu et al 26 in studies on the decolorization of RhB aqueous solutions photocatalyzed by ZnO hollow spheres with porous crystalline shells. Zheng et al 27 synthesized hydrothermally uniform single-crystalline ZnO nanodisks and nanowires with welldefined crystal planes. It was demonstrated that the ZnO nanodisks with a high population of (0001) facet show higher catalytic activity by the comparison of photodegradation of RhB with ZnO nanowires used as the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Photocatalytic Potential of TiO2 and ZnO Obtained by Different Wet Chemical Methods

et al. 2017

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This paper describes the development of TiO 2 and ZnO particles by a chemical route, using two different wet synthesis methods: polymeric precursor (PP) and sol-gel (SG). This study aimed to shed a light on how the synthesis method affects the photocatalytic activity of these oxides. Rhodamine B (RhB) degradation was used as a probe reaction to test the as-synthesized TiO 2 and ZnO photoactivity. It was observed that surface availability, which is related to the presence of synthesis residue, is the key parameter to determine photoactivity. ZnO PP and ZnO SG presented degradation of 88% to RhB. Both samples presented synthesis residue on the surface. On the other hand, TiO 2 PP presented a better performance than TiO 2 SG, once 90% of RhB was degraded, while TiO 2 SG degraded 80% of the dye. In this case, TiO 2 PP was free of synthesis residue on the surface, while TiO 2 SG presented residues.

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Facet enhanced photocatalytic effect with uniform single-crystalline zinc oxide nanodisks

Cited by 163 publications

References 59 publications

Enhanced photocatalytic activity for titanium dioxide by co-modification with copper and iron

Enhanced photocatalytic activity for titanium dioxide by co-modification with copper and iron

Photocatalytic activity of La-doped ZnO nanostructure materials synthesized by sonochemical method

Evaluation of the Photocatalytic Potential of TiO2 and ZnO Obtained by Different Wet Chemical Methods

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