Fabrication of Ordered ZnO/TiO<sub>2</sub> Heterostructures via a Templating Technique

Numerous kinds of photocatalysts such as oxide-, nitride-or sulfide-based semiconductors, conducting polymers or graphene oxide based materials have emerged since the discovery of water splitting on TiO electrodes in . Yet, metal-oxides are still largely the main family of materials promoted into photocatalytic applications.In this chapter, we focus on the application of supported nanostructures of metal oxides, principally TiO and ZnO, for the heterogeneous photocatalysis. We emphasize the benefits of increasing the specific surface area by using the direct growth of metal-oxide nanostructures onto porous templates. "mong the numerous strategies to improve the photocatalytic activity, we detail the fabrication of semiconductor metal-oxide heterostructures promoting the charge separation under UV irradiation. We also describe how the use of plasmonic nanostructures allows the shifting of the light absorption in the visible range. Finally, we give an overview on the new strategies to increase the photocatalytic activity with new architectures and materials based on metal-oxides.

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“…, TiO 2 /ZnO[42][43][44][45], TiO 2 /WO 3[46], or ZnO/CuS[47]. ZnO and TiO 2 are two metal-oxides with similar properties.…”

mentioning

confidence: 99%

TiO2- and ZnO-Based Materials for Photocatalysis: Material Properties, Device Architecture and Emerging Concepts

Ishchenko¹,

Rogé²,

Lamblin³

et al. 2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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“…Synthesis of porous metal‐oxide semiconductor in a controllable manner has become an interesting subject because of the enhanced physical , electrochemical and optical properties tightly associated with their specially lower dimensionality . Thus, among the various nanostructured porous metal‐oxide semiconductors, ZnO is proposed as an important substance with wide applications such as a field‐effect transistor , a dye‐sensitized solar cell and photocatalysis .…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of Porous ZnS and ZnO Films by Coaxial Electrospinning for Highly Efficient Photodegradation of Organic Dyes

Wang

Liang

Cheng

et al. 2017

Photochem & Photobiology

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Porous ZnS and ZnO nano-crystal films were fabricated via a three-step procedure. First, Zn(CH 3 COO) 2 /Silk Fibroin nanofiber mats were prepared by coaxial electrospinning. Second, Zn(CH 3 COO) 2 /Silk Fibroin mats were immersed in NaS solution to react with S 2À to obtain ZnS/Silk Fibroin nanofiber mats. Finally, ZnO porous films were prepared by calcination of ZnS/Silk Fibroin composite mat at 600°C in air atmosphere. When ZnS/Silk Fibroin mats were calcinated in nitrogen, ZnS/Carbon composite mats were obtained accordingly. The resulting porous films were fully characterized. The ZnO porous films were the aggregation of ZnO nano-crystal with hexagonal wurtzite structure. The seize of ZnO was estimated in the range of 10-20 nm. Both of the ZnS and ZnO nano-crystal films exhibited high photocatalytic activities for the photodegradation of Methylene blue and Rhodamine B. It was also found that ZnO porous films are better than ZnS/Carbon nanofiber mats. In addition, photocatalysis of a real wastewater sample from a printing and dyeing company was conducted. The ZnO porous films exhibited excellent performance to treat the real samples. Moreover, the porous ZnO nano-crystal photocatalyst could easily be recycled without notable loss of catalysis ability.

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“…A variety of conversion technologies are used for lignin, such as hydrothermal conversion, pyrolysis (Wang et al 2009;Jiang et al 2010a;Jiang et al 2010b), enzymatic degradation (Xia et al 2003), photocatalytic degradation (Lei et al 2013), electrochemical degradation (Tian et al 2010), ionic liquids degradation (Binder et al 2009), and…”

Section: Introductionmentioning

confidence: 99%

Analytical Pyrolysis Pathways of Guaiacyl Glycerol-β-guaiacyl Ether by Py-GC/MS

Liu

Lyu

et al. 2016

BioResources

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A synthetic method for obtaining a lignin model compound of β-O-4 structure, guaiacyl glycerol-β-guaiacyl ether, was researched through five reaction steps from guaiacol. The key step of this synthetic method was the condensation reaction between 4-(α-bromoacetyl)-guaiacol (III) and guaiacol (I). The compounds were characterized by 1 H nuclear magnetic resonance spectroscopy ( 1 H-NMR) and two-dimensional nuclear magnetic resonance (2D-NMR). Pyrolysis behaviors of guaiacyl glycerol-β-guaiacyl ether were investigated by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The thermal behavior and the evolution profiles of major volatile fragments from the guaiacyl glycerol-β-guaiacyl ether pyrolysis were evaluated. Guaiacol is the major product through Cβ-O homolysis at low temperatures. Cβ-O homolysis and Cβ-O concerted decomposition occurred at moderate temperatures, producing guaiacol, 2-hydroxybenzaldehyde, 2-methoxybenzaldehyde, and various phenolic compounds. At high temperatures, the products obtained from Cβ-O homolysis and Cβ-O concerted decomposition experienced secondary thermal cracking, generating a large number of small molecule products, which increased the complexity of the pyrolytic products.

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Fabrication of Ordered ZnO/TiO₂ Heterostructures via a Templating Technique

Cited by 43 publications

References 29 publications

TiO2- and ZnO-Based Materials for Photocatalysis: Material Properties, Device Architecture and Emerging Concepts

TiO2- and ZnO-Based Materials for Photocatalysis: Material Properties, Device Architecture and Emerging Concepts

Facile Fabrication of Porous ZnS and ZnO Films by Coaxial Electrospinning for Highly Efficient Photodegradation of Organic Dyes

Analytical Pyrolysis Pathways of Guaiacyl Glycerol-β-guaiacyl Ether by Py-GC/MS

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Fabrication of Ordered ZnO/TiO2 Heterostructures via a Templating Technique

Cited by 43 publications

References 29 publications

TiO2- and ZnO-Based Materials for Photocatalysis: Material Properties, Device Architecture and Emerging Concepts

TiO2- and ZnO-Based Materials for Photocatalysis: Material Properties, Device Architecture and Emerging Concepts

Facile Fabrication of Porous ZnS and ZnO Films by Coaxial Electrospinning for Highly Efficient Photodegradation of Organic Dyes

Analytical Pyrolysis Pathways of Guaiacyl Glycerol-β-guaiacyl Ether by Py-GC/MS

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Fabrication of Ordered ZnO/TiO₂ Heterostructures via a Templating Technique