Sunlight highly photoactive Bi2WO6–TiO2 heterostructures for rhodamine B degradation

Colón, G.; Murcia-López, Sebastián; Hidalgo, M.C.; Navı́o, J.A.

doi:10.1039/c0cc00058b

Cited by 132 publications

(72 citation statements)

References 12 publications

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“…The nanoheterostructures which are also called combined nanocrystals show improved property which is distinct from that of any component in them. The mutual transfer of photogenerated charge carriers of nanomaterials of different semiconductors can enhance the photocatalytic efficiency [142][143][144]. On the basis of electron transfer process for two or more desirable semiconductors where photogenerated electrons can flow from one semiconductor with a higher CBM to the other with a lower CBM, is of great importance in better realization of photocatalytic degradation of organic pollutants [145][146][147].…”

Section: Photocatalysis By Zno Nanocompositementioning

confidence: 99%

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Johar

Afzal

Alazba

et al. 2015

Advances in Materials Science and Engineering

130

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Nanocomposites have a great potential to work as efficient, multifunctional materials for energy conversion and photoelectrochemical reactions. Nanocomposites may reveal more improved photocatalysis by implying the improvements of their electronic and structural properties than pure photocatalyst. This paper presents the recent work carried out on photoelectrochemical reactions using the composite materials of ZnO with CdS, ZnO with SnO 2 , ZnO with TiO 2 , ZnO with Ag 2 S, and ZnO with graphene and graphene oxide. The photocatalytic efficiency mainly depends upon the light harvesting span of a material, lifetime of photogenerated electron-hole pair, and reactive sites available in the photocatalyst. We reviewed the UV-Vis absorption spectrum of nanocomposite and photodegradation reported by the same material and how photodegradation depends upon the factors described above. Finally the improvement in the absorption band edge of nanocomposite material is discussed.

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Section: Photocatalysis By Zno Nanocompositementioning

confidence: 99%

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Johar

Afzal

Alazba

et al. 2015

Advances in Materials Science and Engineering

130

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“…The enhancement in optical absorption due to surface defects by doping has been studied by several research groups using different transition metals such as Cd, 4 Cu, 5 Co, 6 Mn, 16 Metal tungstates as ancestors of multicomponent metal oxide compounds, have been well thought-out largely due to their fascinating structures, interesting physic-chemical behavior, as well as their extensive range of applications in various elds specically in photocatalysis. [17][18][19][20][21][22] Nowadays research is focussed on doping of ZnO with rare earth metals and their oxides for the enhancement of photocatalytic activity of ZnO. [23][24][25][26][27] In this connection here we introduced a rare earth metal tungstate, Dy 2 WO 6 , doped ZnO nanoparticles, synthesised by simple hydrothermal method and analysed its photocatalytic activity under natural sun light irradiation in the degradation of two azo dyes (Rhodamine-B and Trypan Blue).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal fabrication of natural sun light active Dy₂WO₆ doped ZnO and its enhanced photo-electrocatalytic activity and self-cleaning properties

2017

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In this article we report the fabrication of 3 wt% Dy 2 WO 6 doped ZnO via a template-free hydrothermal process and its photocatalytic activity against azo dyes Rhodamine-B (Rh-B) and Trypan Blue (TB) in solar light irradiation.The as prepared Dy 2 WO 6 doped ZnO was characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution scanning electron microscopy (HR-SEM) field emission transmission electron microscopy (FE-TEM), X-ray photoelectron spectroscopy (XPS), diffused reflectance (DRS) and photoluminescence (PL) spectroscopy. The results suggested that rare earth tungstate doping, with Dy 2 WO 6 , on ZnO has a great influence on the photocatalytic activity. Dy 2 WO 6 -ZnO possesses high reusability without appreciable loss of catalytic activity up to four runs and exhibits higher electrocatalytic activity than the prepared ZnO for methanol electrooxidation in alkaline medium, revealing its promising potential as the anode catalyst in direct methanol fuel cells. Hydrophobicity of ZnO increases on doping with Dy 2 WO 6 .

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“…Among these, doping of TiO 2 with hybrid atoms or coupling of TiO 2 with other semiconductors with low band gaps have proved to be viable ways to allow the extension of the light absorption edge. [3][4][5] An alternative option consists of the creation of new single phase visible active catalysts which would overcome the drawbacks of doping. [6][7][8] The other challenging composite configuration, rarely in use but currently under exploration, consists of the combination of a luminescence material with a photoactive catalyst.…”

mentioning

confidence: 99%

Evidence of upconversion luminescence contribution to the improved photoactivity of erbium doped TiO2 systems

Obregón

Colón

2012

Chem. Commun.

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Er 3+ -TiO 2 synthesized by a surfactant free hydrothermal method exhibits good photoactivities under sun-like excitation for the degradation of phenol. The presence of Er 3+ does not affect the structural and morphological features of the TiO 2 significantly. The best photocatalytic performance was attained for the samples with 2 wt% of Er. Different photocatalytic runs indicated that the incorporation of the Er 3+ cation would be responsible for the enhanced photocatalytic activity, which participates in different mechanisms under UV and NIR excitation.It is widely accepted that the photocatalytic technology based on semiconductor photoactive materials provides a feasible route to achieve two important processes for environmental control and producing energy, such as pollutant degradation and hydrogen production. 1 Nowadays, the environmental problems demand increasingly severe regulations that open up opportunities for novel green photocatalytic routes leading to the alternative materials to traditional TiO 2 . 2 In order to improve the photocatalytic process, the utilization of solar light as efficiently as possible has been largely pursued. Thus, the use of visible light photons constitutes the key point for a good photocatalyst performance under sunlight conditions. For this scope, different strategies have been traditionally followed, in all cases for the improvement of visible photon absorption. Among these, doping of TiO 2 with hybrid atoms or coupling of TiO 2 with other semiconductors with low band gaps have proved to be viable ways to allow the extension of the light absorption edge. [3][4][5] An alternative option consists of the creation of new single phase visible active catalysts which would overcome the drawbacks of doping. [6][7][8] The other challenging composite configuration, rarely in use but currently under exploration, consists of the combination of a luminescence material with a photoactive catalyst. 9,10 Within this configuration the exploitation of the radiation range not absorbed by the photocatalysts would be achieved. This approach appears to be a completely new alternative for enhancing the efficiency of the photocatalytic process by a wise handling of the arriving photons. It is clear that non-interacting photons drastically diminish the quantum yield under solar irradiation conditions. Thus, the combination of the photocatalytic system with the so-called phosphor material (formed by luminescent ions on a host matrix) which could handle and transform the incoming sunlight radiation turns out to be an interesting and not yet fully explored highway. The applications of the up-conversion process by phosphor-like systems (e.g. NIR or visible to UV) would optimize the photocatalytic performance of traditional UV active photocatalysts. 11,12 Among various up-converting nanomaterials, Er 3+ -based compounds constitute an interesting option for this purpose which could be excited by NIR or visiblelight, showing luminescence in the visible and UV regions. 13 Therefore, the assembly of TiO ...

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Sunlight highly photoactive Bi2WO6–TiO2 heterostructures for rhodamine B degradation

Cited by 132 publications

References 12 publications

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Hydrothermal fabrication of natural sun light active Dy₂WO₆ doped ZnO and its enhanced photo-electrocatalytic activity and self-cleaning properties

Evidence of upconversion luminescence contribution to the improved photoactivity of erbium doped TiO2 systems

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Sunlight highly photoactive Bi2WO6–TiO2 heterostructures for rhodamine B degradation

Cited by 132 publications

References 12 publications

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

Hydrothermal fabrication of natural sun light active Dy2WO6 doped ZnO and its enhanced photo-electrocatalytic activity and self-cleaning properties

Evidence of upconversion luminescence contribution to the improved photoactivity of erbium doped TiO2 systems

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Hydrothermal fabrication of natural sun light active Dy₂WO₆ doped ZnO and its enhanced photo-electrocatalytic activity and self-cleaning properties