Large Ultrathin Anatase TiO<sub>2</sub> Nanosheets with Exposed {001} Facets on Graphene for Enhanced Visible Light Photocatalytic Activity

Wang, Wansheng; Wang, Donghong; Qu, Wen-Gang; Lu, Liqiang; Xu, An‐Wu

doi:10.1021/jp306498b

Cited by 342 publications

(145 citation statements)

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“…Thus, a proper combination of graphene and TiO2 would give rise to nanocomposites exhibiting the properties of the respective building nanoscaled components with eventual synergetic effect allowing high efficiency for specific applications. A fairly large number of preparation methods of nanocomposites obtained from TiO2 and graphene for photocatalytic applications have been reported which include thermal and solvothermal reactions, sol-gel route [24,25], hydrolysis, impregnation, liquid phase deposition [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Atout

Álvarez

Chebli

et al. 2017

Materials Research Bulletin

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Highlights• TiO2-RGO nanocomposites presented, in all the cases studied, improved photocatalytic properties compared to bare TiO2.• An optimal composition, in terms of TiO2/RGO ratio was found in both series of nanocomposites; however, superior activity was found for those prepared by direct sol-gel route.• Nanocomposites prepared by sol-gel method presented improved textural properties than those prepared following a hydrothermal route.• Optimization in the preparation of hybrid photocatalystsis needed to obtain materials with finer properties for effective application in environmental AbstractIn this study, two different preparation methods of titanium dioxide nanoparticles/reduced graphene oxide nanocomposites were investigated using direct sol-gel method followed by 3 hydrothermal treatment or simple hydrothermal route. A different amount of graphene (1-20%) was mixed with TiO2 for both series of samples in order to improve the photocatalytic activity. The influence of the preparation method on the physico-chemical properties was established by different characterization methods and the photocatalytic degradation of methylene blue (MB) under UV light irradiation was used as test reaction. The highest photocatalytic activity was observed for the nanocomposites containing 10 wt% of graphene.The elimination of MB can reach 93% and 82% for the nanocomposites with 10 wt% graphene prepared by the sol-gel and hydrothermal methods, respectively. These photocatalysts are promising for practical application in nanotechnology.

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Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Atout

Álvarez

Chebli

et al. 2017

Materials Research Bulletin

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“…Nanosheets of various layered metal oxides have been prepared [6]. Layered TiO 2 has been extensively studied for its dielectric properties and photocatalytic activity [104,105]. Rutile form of TiO 2 has one of the highest dielectric constants (80-100) among the binary oxides [104].…”

Section: Metal Oxidesmentioning

confidence: 99%

Transition Metal Dichalcogenides and Other Layered Materials

Jana¹,

Rao²

2017

2D Inorganic Materials Beyond Graphene

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Abstract. The importance of two-dimensional (2D) materials needs to be recognised in a big way due to the discovery of graphene. It is noteworthy that research on 2D inorganic layered materials in the last few years has shown that these materials are equally fascinating, exhibiting several novel properties and phenomena. Especially, noteworthy is the variety of fascinating properties of single and few layers of MoS2 and related dichalcogenides. WTe2 exhibits the largest magnetoresistance recorded in materials. Then there are topological insulators such as Bi2Se3. Besides chalcogenides, there are materials such as boron nitrides and Borocarbonitrides with several interesting features. This chapter presents a brief review of the various 2D materials of interest today.

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Section: Salinitymentioning

confidence: 99%

“…However, studies on salinity effect on toxicity of ZnO-NPs are relatively scarce. A study on the salinity-dependent toxicity of ZnO-NPs showed that increasing in salinity from 5 to 35 PSU (practical salinity unit) decreased the dissolved Ecotoxicity of Zinc Oxide Nanoparticles in the Marine Environment 927 E zinc ion concentration due to precipitation of the metal ions and consequently reduced the toxicity to the marine copepod T. japonicus [45].pH Changes in ion dissolution and aggregation size of ZnO-NPs can occur following from a change in pH. Miao et al [19] compared the toxicity of ZnO-NPs on the marine diatom T. pseudonana at different pH levels (i.e., pH 7-9) and attributed the elevated toxicity of ZnO-NPs at low pH to an increase in the release of zinc ions from ZnO-NPs in the exposure medium.…”

mentioning

confidence: 99%

EUV Lithography

Mbanaso¹,

Denbeaux²

2016

Encyclopedia of Nanotechnology

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SynonymsEnvironmental toxicology; Nano-ecotoxicology; Toxicity of metal and metal oxide nanoparticles on Prokaryotes (bacteria), unicellular and invertebrate Eukaryotes DefinitionA toxic product is a chemical compound that harms the environment by affecting the biological organisms. Due to their novel properties, nanoparticles (NPs) cannot be considered as other organic and inorganic xenobiotics in the environment, e.g., pesticides, HAPs and PCBs dissolved metals, or also medicines. NPs have a mass, a charge, and above all a surface area. They are subject to phenomena of classical and quantum physics. Their reactivity means that their surface atoms are labile, easily change their redox state, and highly reactive with respect to compounds in the environment. Considering the huge range of applications using NPs, it seems reasonable to expect their dissemination in the environment at each step in their life cycle, from design through production to use and disposal of finished products. To date, the data available show that NPs can cross biological membranes and distribute themselves within different compartments of living organisms, or can also induce a remote toxicity. Consequently, there is a need to elucidate how the NPs can lead to adverse effects on organisms in their natural environment, considering not only their effects on target organs and life traits, but also their fate and transfers within the food webs ( Fig. 1) (Box 1). Box 1: Ecosystem and Food ChainsAn ecosystem is the basic functional unit in ecology, as it includes both organisms and their abiotic environments (Fig. 1). It represents the highest level of ecological integration based on energy and biomass transfers. It is defined as a specific unit of all the organisms occupying a given area that interacts with the physical environment producing distinct trophic structure, biotic diversity, and material cycling. OverviewThe number of available publications (Fig. 2) dealing with the environmental impacts of NPs (called nano-ecotoxicology [1]) is presented in Fig. 2. Studies regarding algae, protozoa, and invertebrates are more recent (since 2006) than the ones regarding bacteria (which started in the 1980s) (ISI Web of Knowledge source) (Box 2). As a consequence, researches on bactericidal effects are more advanced (already at the scale of biofilms and the microbial community Ecotoxicity of Inorganic Nanoparticles: From Unicellular Organisms to Invertebrates structures), while for the other models nanoecotoxicology is still in its infancy (at the individual scale). About 30 species of invertebrates are studied regarding the three main ecosystemic domains: freshwater, marine, and terrestrial. For each domain, the Crustacean Cladocera Daphniidae (freshwater), the Mollusks Bivalvia Mytilidae, and Annelids Polychaetes (marine) are the most studied invertebrates, while the terrestrial (earthworms and isopods) examples are scarce.Considering the three-domain system that divides cellular life into archaea, bacteria, and eukaryote domains (based on diff...

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Large Ultrathin Anatase TiO₂ Nanosheets with Exposed {001} Facets on Graphene for Enhanced Visible Light Photocatalytic Activity

Cited by 342 publications

References 67 publications

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Transition Metal Dichalcogenides and Other Layered Materials

EUV Lithography

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Large Ultrathin Anatase TiO2 Nanosheets with Exposed {001} Facets on Graphene for Enhanced Visible Light Photocatalytic Activity

Cited by 342 publications

References 67 publications

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Transition Metal Dichalcogenides and Other Layered Materials

EUV Lithography

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Large Ultrathin Anatase TiO₂ Nanosheets with Exposed {001} Facets on Graphene for Enhanced Visible Light Photocatalytic Activity