Graphene oxide prepared from mechanically milled graphite: Effect on strength of novel fly-ash based cementitious matrix

Sharma, Snigdha; Susan, Divya; Kothiyal, N.C.; Kaur, Ramanjit

doi:10.1016/j.conbuildmat.2018.05.051

Cited by 57 publications

(12 citation statements)

References 34 publications

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“…The data suggest that the GO remains on the surface after being exposed to temperatures up to 600°C. Other studies found similar results and one reported that combustion begins to occur at temperatures closer to 650°C (Guadagno et al 2015;Sharma et al 2018). Thermal stability of GO was not affected within the range of temperature of our study.…”

Section: Characterization Of Zeolitesupporting

confidence: 90%

Removal of emerging persistent organic pollutants (Em-POPs) model compounds from water using a natural porous material functionalized with graphene-based products

Boehm

Lecus

Zhang³

et al. 2020

H2Open Journal

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This study focuses on the removal of three model compounds, classified as emerging persistent organic pollutants (Em-POPs), from water using a modified version of natural Australian zeolite. Following a series of subsequent treatments and vacuum deposition of graphene oxide (GO), both chemical and physical properties of the adsorbent were characterized. The GO-coated zeolite was tested for the removal of methylene blue (MB), disperse blue 26 (DB26), and sodium fluorescein (NaFn). Results show excellent removal capability for MB and DB26 dyes and decent removal for NaFn when compared to commercially available products such as granular activated carbon. Regeneration of the adsorbent showed virtually no loss in adsorptive performance after two cycles, with MB and DB26.

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Section: Characterization Of Zeolitesupporting

confidence: 90%

Removal of emerging persistent organic pollutants (Em-POPs) model compounds from water using a natural porous material functionalized with graphene-based products

Boehm

Lecus

Zhang³

et al. 2020

H2Open Journal

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show abstract

“…The maximum of the peak was observed at 1596 cm −1 and 1600 cm −1 wavenumber values for GO15 and GO30 samples, respectively. This shift to higher wavenumbers suggested a reduction of the in-plane sp 2 domains as a result of the oxidation of graphite [43]. In the same fashion, an increase in the wavenumber of D band was observed in the GO30 sample (1348 cm −1 and 1351 cm −1 for GO15 and GO30, respectively).…”

Section: Oxidation Processsupporting

confidence: 58%

Influence of Process Parameters in Graphene Oxide Obtention on the Properties of Mechanically Strong Alginate Nanocomposites

et al. 2020

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Sodium alginate, a biopolymer extracted from brown algae, has shown great potential for many applications, mainly due to its remarkable biocompatibility and biodegradability. To broaden its fields of applications and improve material characteristics, the use of nanoreinforcements to prepare nanocomposites with enhanced properties, such as carbonaceous structures which could improve thermal and mechanical behavior and confer new functionalities, is being studied. In this work, graphene oxide was obtained from graphite by using modified Hummers' method and exfoliation was assisted by sonication and centrifugation, and it was later used to prepare sodium alginate/graphene oxide nanocomposites. The effect that different variables, during preparation of graphene oxide, have on the final properties has been studied. Longer oxidation times showed higher degrees of oxidation and thus larger amount of oxygen-containing groups in the structure, whereas longer sonication times and higher centrifugation rates showed more exfoliated graphene sheets with lower sizes. The addition of graphene oxide to a biopolymeric matrix was also studied, considering the effect of processing and content of reinforcement on the material. Materials with reinforcement size-dependent properties were observed, showing nanocomposites with large flake sizes, better thermal stability, and more enhanced mechanical properties, reaching an improvement of 65.3% and 83.3% for tensile strength and Young's modulus, respectively, for a composite containing 8 wt % of graphene oxide.

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“…Mohammed et al [ 20 ] concluded that GO has the potential to refine the microstructure of cementitious materials by increasing the number of gel pores and decreasing the number of capillary pores, thereby altogether efficiently enhancing the mechanical strength of cement composite. Furthermore, according to Sharma et al [ 21 ] and Sharma and Kothiyal [ 22 ], it was concluded that the total porosity of cementitious composites with 1% GO can be reduced from 25.21% to 10.61%.…”

Section: Introductionmentioning

confidence: 99%

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

et al. 2020

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Engineered cementitious composite (ECC) was discovered as a new substitute of conventional concrete as it provides better results in terms of tensile strain, reaching beyond 3%. From then, more studies were done to partially replace crumb rubber with sand to achieve a more sustainable and eco-friendlier composite from the original ECC. However, the elastic modulus of ECC was noticeably degraded. This could bring potential unseen dangerous consequences as the fatigue might happen at any time without any sign. The replacement of crumb rubber was then found to not only bring a more sustainable and eco-friendlier result but also increase the ductility and the durability of the composite, with lighter specific gravity compared to conventional concrete. This study investigated the effects of crumb rubber (CR) and graphene oxide (GO) toward the deformable properties of rubberized ECC, including the compressive strength, elastic modulus, Poisson’s ratio, and drying shrinkage. Central composite design (CCD) was utilized to provide 13 reasonable trial mixtures with the ranging level of CR replacement from 0–30% and that of GO from 0.01–0.08%. The results show that GO increased the strength of the developed GO-RECC. It was also found that the addition of CR and GO to ECC brought a notable improvement in mechanical and deformable properties. The predicted model that was developed using response surface methodology (RSM) shows that the variables (compression strength, elastic modulus, Poisson’s ratio, and drying shrinkage) rely on the independent (CR and GO) variables and are highly correlated.

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Graphene oxide prepared from mechanically milled graphite: Effect on strength of novel fly-ash based cementitious matrix

Cited by 57 publications

References 34 publications

Removal of emerging persistent organic pollutants (Em-POPs) model compounds from water using a natural porous material functionalized with graphene-based products

Removal of emerging persistent organic pollutants (Em-POPs) model compounds from water using a natural porous material functionalized with graphene-based products

Influence of Process Parameters in Graphene Oxide Obtention on the Properties of Mechanically Strong Alginate Nanocomposites

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

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