Microwave Synthesis of MOFs/Graphene Oxide Composites and Hydrogen Storage Properties

Metal-organic frameworks (MOFs: copper containing CuBTC)-graphene oxide (GO) composite (CG) was synthesized using microwave heating. The parent material and the composite were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), nitrogen sorption, scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (HRTEM) and Raman spectroscopy. Then their hydrogen storage properties were systematically tested. The composite material CG shows a remarkable H2 capacity up to 2.43 wt% (28.6% increases vs. CuBTC) and higher surface area and pore volume compared to the neat CuBTC. And the particle size of CG is down to nanometer scale.

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Synthesis of MIL-125/Graphene Oxide Composites and Hydrogen Storage Properties

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.727.683 ◽

2017 ◽

Vol 727 ◽

pp. 683-687 ◽

Cited By ~ 2

Author(s):

Tian Bao Yang ◽

Li Xian Sun ◽

Fen Xu ◽

Zi Qiang Wang ◽

Yong Jin Zou ◽

...

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Hydrogen Storage ◽

Parent Material ◽

X Ray Diffraction ◽

Hydrogen Storage Properties ◽

Transmission Electron ◽

Metal Organic ◽

Ft Ir ◽

Storage Properties

Metal-organic frameworks (MOFs: MIL-125)-graphene oxide (GO) composite (MO) was synthesized by solvothermal method. All the materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy. Then their hydrogen storage properties were systematically tested under 1 bar and 77K. The composite material MO-1 possesses higher surface area than the parent material MIL-125 and shows a remarkable H2 capacity up to 2.5 wt% (38% increases vs. MIL-125).

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Enhanced Microwave Absorption Properties of Metal Organic Framework (MOF)-Derived Carbonaceous ZnO Incorporated Reduced Graphene Oxide Composites

NANO ◽

10.1142/s179329201950005x ◽

2019 ◽

Vol 14 (01) ◽

pp. 1950005 ◽

Cited By ~ 3

Author(s):

Zhongfei Liu ◽

Jiangtao Yuan ◽

Hui Zhang ◽

Kuangwei Xiong ◽

Shaowei Jin ◽

...

Keyword(s):

Electron Microscopy ◽

Photoelectron Spectroscopy ◽

Metal Organic Framework ◽

X Ray Diffraction ◽

Microwave Absorption Properties ◽

X Ray ◽

Transmission Electron ◽

Reduced Graphene ◽

Metal Organic ◽

Oxide Composites

In this paper, the MOFs-derived carbonaceous ZnO and RGO (carbonaceous ZnO/RGO) composites have been prepared by the wet chemical method and carbonization process. The as-prepared products are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM), Raman spectra, thermogravimetric (TG) analysis and X-ray photoelectron spectroscopy (XPS). The electromagnetic parameters of carbonaceous ZnO/RGO composites are investigated by the vector network analyzer. The results exhibit carbonaceous ZnO/RGO composites have a maximum absorption of [Formula: see text][Formula: see text]dB at 6[Formula: see text]GHz with thickness of 3.5[Formula: see text]mm and the effective absorption (below [Formula: see text][Formula: see text]dB) bandwidth is up to 1.92[Formula: see text]GHz (from 5.28 to 7.2[Formula: see text]GHz). Thus, the carbonaceous ZnO/RGO composites have great potential in the field of electromagnetic wave absorption.

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Hydrogen storage properties of mechanically alloyedMg–8 mol% LaNi0.5 composite

Journal of Materials Research ◽

10.1557/jmr.2004.0396 ◽

2004 ◽

Vol 19 (10) ◽

pp. 2871-2876 ◽

Cited By ~ 14

Author(s):

Qian Li ◽

Qin Lin ◽

Kuo-Chih Chou ◽

Li-Jun Jiang ◽

Feng Zhan

Keyword(s):

Hydrogen Storage ◽

Mechanical Alloying ◽

X Ray Diffraction ◽

Equilibrium Pressure ◽

Hydrogen Storage Properties ◽

X Ray ◽

Transmission Electron ◽

Lower Temperature ◽

Material Preparation ◽

Storage Properties

A new nano-ternary Mg–8 mol% LaNi0.5 was prepared by melted and subsequent mechanical alloying technique for hydrogen storage. It was found from our experiments that, this kind of alloy had superior hydriding/dehydriding characteristics in comparison with conventional materials for hydrogen storage. It possessed large hydrogen capacity at a lower temperature, which could absorb 4.55–7.01 mass% H under 3 MPa hydrogen pressure and desorb 4.40–6.90 mass% H under 0.0133 MPa in 600 s above 423 K without any activation requirement drawn from our pressure-composition isotherm and kinetic experiments. Through the x-ray diffraction and transmission electron microscopy experiments, we further found that these superior characteristics could be attributed to the multiphase structure and a catalytic effect of LaH3 and Mg2Ni that were formed in the material preparation of mechanical alloying process. Finally, based on these data the relationships between equilibrium pressure of hydrogen and temperature were obtained, they were lgp(0.1 MPa) = −3985/T + 7.188(553 K ⩽ T ⩽ 573K) for hydriding and lgp(0.1 MPa) = −3804/T + 6.770 (553 K ⩽ T ⩽ 573 K) for dehydriding.

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Synthesis of Polyaniline coated Graphene Oxide @ SrTiO3 Nanocube Nanocomposites for Enhanced Removal of Carcinogenic Dyes from Aqueous Solution

10.20944/preprints201608.0128.v1 ◽

2016 ◽

Cited By ~ 2

Author(s):

Syed Shahabuddin ◽

Norazilawati Muhamad Sarih ◽

Muhammad Afzal Kamboh ◽

Hamid Rashidi Nodeh ◽

Sharifah Mohamad

Keyword(s):

Electron Microscopy ◽

Aqueous Solution ◽

Methylene Blue ◽

Graphene Oxide ◽

Methyl Orange ◽

Oxidative Polymerization ◽

X Ray Diffraction ◽

Transmission Electron ◽

Polymerization Method

The present investigation highlights the synthesis of polyaniline (PANI) coated graphene oxide doped with SrTiO3 nanocube nanocomposites through facile in-situ oxidative polymerization method for the efficient removal of carcinogenic dyes, namely, the cationic dye methylene blue (MB) and the anionic dye methyl orange (MO). The synthesised nanocomposites were characterised by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The adsorption efficiencies of graphene oxide (GO), PANI homopolymer and SrTiO3 nanocubes-doped nanocomposites were assessed by monitoring the adsorption of methylene blue and methyl orange dyes from aqueous solution. The adsorption efficiency of nanocomposites doped with SrTiO3 nanocubes were found to be of higher magnitude as compared with undoped nanocomposite. Moreover, the nanocomposite with 2 wt% SrTiO3 with respect to graphene oxide demonstrated excellent adsorption behaviour with 99% and 91% removal of MB and MO respectively, in a very short duration of time.

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Reduced Graphene Oxide–Epoxy Grafted Poly(Styrene-Co-Acrylate) Composites for Corrosion Protection of Mild Steel

Coatings ◽

10.3390/coatings9100666 ◽

2019 ◽

Vol 9 (10) ◽

pp. 666

Author(s):

Xinchuan Fan ◽

Yue Hu ◽

Yijun Zhang ◽

Jiachen Lu ◽

Xiaofeng Chen ◽

...

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Photoelectron Spectroscopy ◽

X Ray Diffraction ◽

Corrosion Properties ◽

X Ray ◽

Transmission Electron ◽

Reduced Graphene ◽

Scanning Electron

Reduced graphene oxide–epoxy grafted poly(styrene-co-acrylate) composites (GESA) were prepared by anchoring different amount of epoxy modified poly(styrene-co-acrylate) (EPSA) onto reduced graphene oxide (rGO) sheets through π–π electrostatic attraction. The GESA composites were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The anti-corrosion properties of rGO/EPSA composites were evaluated by electro-chemical impedance spectroscopy (EIS) in hydroxyl-polyacrylate coating, and the results revealed that the corrosion rate was decreased from 3.509 × 10−1 to 1.394 × 10−6 mm/a.

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Structural Characterization of Graphene Oxide: Surface Functional Groups and Fractionated Oxidative Debris

Nanomaterials ◽

10.3390/nano9081180 ◽

2019 ◽

Vol 9 (8) ◽

pp. 1180 ◽

Cited By ~ 41

Author(s):

Elvin Aliyev ◽

Volkan Filiz ◽

Muntazim M. Khan ◽

Young Joo Lee ◽

Clarissa Abetz ◽

...

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Functional Groups ◽

Structural Model ◽

Oxide Surface ◽

Resonance Spectroscopy ◽

X Ray Diffraction ◽

Surface Functional Groups ◽

X Ray ◽

Transmission Electron

The purpose of this work is the structural analysis of graphene oxide (GO) and by means of a new structural model to answer the questions arising from the Lerf–Klinowski and the Lee structural models. Surface functional groups of GO layers and the oxidative debris (OD) stacked on them were investigated after OD was extracted. Analysis was performed successfully using Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), X-ray photoemission spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy, solid-state nuclear magnetic resonance spectroscopy (SSNMR), standardized Boehm potentiometric titration analysis, elemental analysis, X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The analysis showed that graphene oxide layers, as well as oxidative debris contain different functional groups such as phenolic –OH, ketone, lactone, carboxyl, quinone and epoxy. Based on these results, a new structural model for GO layers is proposed, which covers all spectroscopic data and explains the presence of the other oxygen functionalities besides carboxyl, phenolic –OH and epoxy groups.

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Interrogating Kinetic versus Thermodynamic Topologies of Metal–Organic Frameworks via Combined Transmission Electron Microscopy and X-ray Diffraction Analysis

Journal of the American Chemical Society ◽

10.1021/jacs.9b01789 ◽

2019 ◽

Vol 141 (15) ◽

pp. 6146-6151 ◽

Cited By ~ 27

Author(s):

Xinyi Gong ◽

Hyunho Noh ◽

Nathan C. Gianneschi ◽

Omar K. Farha

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Diffraction Analysis ◽

Metal Organic Frameworks ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Metal Organic

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Synthesis and Photocatalytic Activity of Visible-Light Responsive BiOBr/GO Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.807 ◽

2017 ◽

Vol 751 ◽

pp. 807-812

Author(s):

Tuangphorn Prasitthikun ◽

X. Wu ◽

Tsugio Sato ◽

Charusporn Mongkolkachit ◽

Pornapa Sujaridworakun

Keyword(s):

Electron Microscopy ◽

Graphene Oxide ◽

Visible Light ◽

High Efficiency ◽

Precipitation Method ◽

Mixed Solution ◽

Diffuse Reflection Spectroscopy ◽

X Ray Diffraction ◽

Transmission Electron ◽

Photocatalytic Activities

High efficiency BiOBr/GO composites photocatalyst were successfully synthesized via a facile precipitation method. The precursors were prepared by dissolving Bi (NO3)3.5H2O and KBr in glycerol and distilled water, respectively. Various amounts (0.1-2 wt%) of graphene oxide were added into the mixed solution precursors, and stirred at room temperature to get precipitated powder without further heat treatment. The obtained products were characterized for phase, morphology, optical properties and surface area by X-ray diffraction (XRD), transmission electron microscopy (TEM), filed-emission scanning electron microscopy (FE-SEM), UV-Vis diffuse reflection spectroscopy (DRS) and Brunauer–Emmett–Teller (BET), respectively. The morphology and structure of as-synthesized samples were composed of numerous fine plates of BiOBr dispersed on the GO sheets. The photocatalytic activities of BiOBr/GO composites were evaluated by rhodamine B degradation under visible light irradiation. As the results, the significant increase in photodegradation of BiOBr/GO composite comparing with pure BiOBr was observed. Among all samples, the composite with 1 wt% of graphene oxide showed the highest photocatalytic performance.

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