Graphene oxide: An emerging electromaterial for energy storage and conversion

Bakhtari

et al. 2021

Environ Sci Pollut Res

In this study, , Cu), and Graphene Oxide (GO) /MIL-101(Fe,Cu) were synthesized to compose a novel sorbent. The adsorption properties of these three MOFs-based composites were compared toward the removal of phosphate. Furthermore, the influencing factors including reaction time, pH, temperature and initial concentration on the adsorption capacity of phosphate on these materials as well as the reusability of the material were discussed. The structure of fabricated materials and the removal mechanism of phosphate on the composite material were analyzed by Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption analysis and zeta potential. The results show that the maximum adsorption capacity of phosphate by the composite GO/MIL-101(Fe,Cu)-2% was 204.60 mg•g -1 , which is higher than that of MIL-101(Fe,Cu) and MIL-101(Fe). likewise the specific surface area of GO/MIL-101(Fe,Cu)-2% is 778.11 m 2 /g is higher than that of Cu) and ,which are 747.75 and 510.66m 2 /g respectively. The adsorption mechanism of phosphate is electrostatic attraction, form coordination bonds and hydrogen bonds. The fabricated material is a promising adsorbent for the removal of phosphate with good reusability.

Section: Introductionmentioning

confidence: 99%

Preparation of GO/MIL-101(Fe,Cu) composite and its adsorption mechanisms for phosphate in aqueous solution

Bakhtari

et al. 2021

Environ Sci Pollut Res

“…[15][16][17][18] Apart from pristine graphene, graphene oxide (GO), composing of abundant oxygen-containing groups on its basal plane and edges, is another extensively studied graphene-based materials owning to its good processibility, tunable functionalization, and easy accessibility. [19][20][21] The unique structural features and superior properties of graphene and GO allow them to be ideal materials as building blocks for highperformance ESC devices such as the electrodes of batteries and supercapacitors, [22][23][24][25] solar steam generators, 26 and electro-thermal conversion devices. 27 However, the strong π-π interactions and van der Waals force between graphene/GO sheets make them irreversible agglomeration and stacking during assembly, resulting in a severe attenuation of their intrinsic properties in macroscopic assemblies and practical devices.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional printing of graphene‐based materials for energy storage and conversion

Jiang

Guo

et al. 2021

SusMat

Developing high‐performance energy storage and conversion (ESC) device relies on both the utilization of good constituent materials and rational design of assembly structure. Graphene‐based materials, due to their superior properties like high electrical/thermal conductivity, large surface area, and unique optical properties, have been extensively reported for ESC applications. The emerging three‐dimensional (3D) printing techniques, especially extrusion‐based direct ink writing technique, have brought a revolutionary improvement in structure control accuracy and designing capability to graphene‐based macro‐assemblies, triggering a boost in functionalities and performances of graphene‐based ESC devices. In these circumstances, understanding the very recent progress of 3D‐printed graphene materials and their design philosophy to bring new concepts for material designs and address the requirements for high‐performance ESC devices are urgently important. In this review, we aim to outline recent developments in 3D printing of graphene‐based materials and their applications in ESC applications. Basic requirements and theoretical analysis for preparation printable inks are discussed, as well as feasible GO ink preparation strategies in existing literatures. The representative explorations of 3D‐printed graphene materials in ESC applications like batteries, supercapacitors, solar steam generators, and electro‐thermal conversion are also reviewed. This study attempts to provide a comprehensive overview of the progresses and limitations of present 3D printed graphene materials, and seeks to enlighten the opportunities and orientations of future research in this field.

“…Graphene oxide (GO), which is prepared by chemical oxidation of natural graphite, is a precious nanomaterial used for many applications, such as for medical [ 26 ], energy storage [ 27 ], flexible sensor [ 28 ], and wastewater treatment [ 29 ] purposes, due to the abundant oxidic groups on its surface and its excellent specific surface area [ 30 ]. GO can be evenly dispersed into an aqueous phase to form strong interactions with polymers [ 14 , 31 ], which can accelerate the gelation of organic pollutant solutions.…”

Section: Introductionmentioning

confidence: 99%

Novel Graphene Oxide Nanohybrid Doped Methacrylic Acid Hydrogels for Enhanced Swelling Capability and Cationic Adsorbability

Lyu

et al. 2021

Polymers

Novel versatile hydrogels were designed and composited based on covalent bond and noncovalent bond self-assembly of poly(methacrylic acid) (PMAA) networks and nanohybrids doped with graphene oxide (GO). The structures and properties of the neat PMAA and the prepared PMAA/GO hydrogels were characterized and analyzed in detail, using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, swelling and cationic absorption, etc. The swelling results showed that the water penetration follows the non-Fick transport mechanism based on swelling kinetics and diffusion theory. The swelling capacity of PMAA and composited PMAA/GO hydrogels toward pH, Na+, Ga2+, and Fe3+ was investigated; the swelling ratio was tunable between 4.44 and 36.44. Taking methylene blue as an example, the adsorption capacity of PMAA/GO hydrogels was studied. Nanohybrid doped GO not only self-associated with PMAA via noncovalent bonding interactions and had a tunable swelling ratio, but also interacted with water molecules via electrostatic repulsion, offering a pH response of both the network and dye absorption. Increases in pH caused a rise in equilibrium swelling ratios and reduced the cumulative cationic dye removal.