Examination of synthesis conditions for graphite-derived nanoporous carbon–silica composites

Wang, Zhengming; Shishibori, Kazuyo; Hoshinoo, K.; Kanoh, Hirofumi; Hirotsu, Takahiro

doi:10.1016/j.carbon.2006.05.018

Cited by 35 publications

(12 citation statements)

References 25 publications

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“…It has been used recently to build various nanocomposites which exhibit enhanced electronic and adsorption properties. [5][6][7][8][9][10] The graphene layers of GO are stacked together with an interlayer distance varying from 6-12 Å depending on the level of hydration. [11] Oxidation of graphite causes introduction of epoxy and hydroxyl groups to the graphene layers, as well as carboxylic groups mainly located on the edges of the layers.…”

Section: Introductionmentioning

confidence: 99%

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

2009

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Graphite oxide (GO) / metal-organic framework (MOF-5) nanocomposites are synthesized with various ratios of the two components. In developing the concept of these new adsorbents, it was expected that distorted graphene sheets would contribute to the enhancement in the dispersive interactions, whereas MOF-5 component would contribute to the expansion of the pore space where adsorbates could be stored. Moreover, taking into account the variety of transition and noble metals, which can be used to form the MOF structure, those materials Moreover, specific combination and synergy between GO and MOF-5 units also result in the formation of a unique porosity characteristic of the nanocomposites.3

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Section: Introductionmentioning

confidence: 99%

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

2009

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“…[21] Owing to its unique structure, GO has been recently used in the preparation of several composite materials with promising electronic and adsorptive properties. [22][23][24][25][26] DOI: 10.1002/adfm.200900880 Composites of the metal-organic framework (MOF), MOF-5, and graphite oxide (GO) with different ratios of the two components are prepared and tested in ammonia removal under dry conditions. The parent and composite materials are characterized before and after exposure to ammonia by sorption of N 2 , X-ray diffraction, thermal analyses, and FT-IR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Adsorption of Ammonia on Metal‐Organic Framework/Graphite Oxide Composites: Analysis of Surface Interactions

Petit

Bandosz

2009

Adv Funct Materials

321

227

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Composites of the metal‐organic framework (MOF), MOF‐5, and graphite oxide (GO) with different ratios of the two components are prepared and tested in ammonia removal under dry conditions. The parent and composite materials are characterized before and after exposure to ammonia by sorption of N2, X‐ray diffraction, thermal analyses, and FT‐IR spectroscopy. The results show a synergetic effect resulting in an increase in the ammonia uptake compared to the parent materials. It is linked to enhanced dispersive forces in the pore space of the composites. Additionally, ammonia interacts with zinc oxide tetrahedra via hydrogen bonding and is intercalated between the layers of GO. Retention of a large quantity of ammonia eventually leads to a collapse of the MOF‐5 structure in the composites. The effect resembles that observed when MOF‐5 is exposed to water. Taking into account the similarity of ammonia and water molecules, it is hypothesized that ammonia causes a destruction of the MOF‐5 and composite structure as a result of its hydrogen bonding with the zinc oxide clusters.

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“…Because TEOS molecules are readily accessible to the internal surface of GO, they form a siloxane network structure through hydrolyzing reaction with residual interlayer water in GO. High‐temperature carbonization gets rid of the remaining auxiliary surfactant, reduces GO layers to graphene (reduced GO), and transforms the intermediate GO‐siloxane network structure to a nanoporous graphene‐silica nanocomposite with a specific surface area greater than 1000 m 2 /g . This method is later improved by a mechanochemical intercalation protocol which employs a required amount but not an unnecessary excess amount of TEOS and by which nanocomposites with a similarly high specific surface area are uneventfully produced .…”

Section: Graphene‐based Photocatalytic Nanocompositementioning

confidence: 99%

Advantaging Synergy Photocatalysis with Graphene‐Related Carbon as a Counterpart Player of Titania

Wang

Hirotsu

et al. 2018

The Chemical Record

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The enhancement of photocatalytic activity of TiO2 can be made either by promoting absorption efficiency of photon energy or by reducing recombination losses of photogenerated charge carriers, for which fabrication of nanocomposite structure with carbon materials is an optional selection. Among various nanocarbons, graphene (G), graphene oxide (GO), and reduced graphene oxide (rGO) are more favorable as the counterpart materials because they can provide availability of both obverse and reverse surface, thus doubling effective sites for adsorption, loading of nanoparticles, and interfacial interaction with the loaded nanoparticles. Composition of G/GO with titania, therefore, is a hopeful strategy for achieving synergy or cooperative effect in photocatalysis. In this personal account, we focus on the background and methodology of several soft chemical approaches that we have utilized up to date to fabricate nanocomposites of G/GO and titania, aiming to shed light on the importance of designing of nanocomposite structure for enhancing photocatalysis. In addition, we emphasize the role of interfacial interaction between carbon and titania by exemplifying a hybridized photocatalyst based on inexpensive biomass‐derived carbon sphere (CS), and demonstrate that it is a crucial influential factor underlying an enhanced visible light photocatalysis. CS can be a better selection as a counterpart component than G/GO, whose core‐shell composing structure with titania (TiO2@CS) can efficiently induce charge transfer so as to achieve a much higher photocatalytic performance under visible light illumination as compared to the composite of rGO and titania.

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Examination of synthesis conditions for graphite-derived nanoporous carbon–silica composites

Cited by 35 publications

References 25 publications

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

MOF–Graphite Oxide Composites: Combining the Uniqueness of Graphene Layers and Metal–Organic Frameworks

Enhanced Adsorption of Ammonia on Metal‐Organic Framework/Graphite Oxide Composites: Analysis of Surface Interactions

Advantaging Synergy Photocatalysis with Graphene‐Related Carbon as a Counterpart Player of Titania

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