Self-propagating solar light reduction of graphite oxide in water

Todorova, N.; Giannakopoulou, T.; Boukos, N.; Vermisoglou, Eleni C.; Lekakou, Constantina; Trapalis, C.

doi:10.1016/j.apsusc.2016.04.088

Cited by 25 publications

(11 citation statements)

References 53 publications

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“…The spectra of graphite oxide samples showed two absorption maximums at around 230 nm and 300 nm. The peak around 230 nm was attributed to the π-π* transitions of aromatic C-C bonds, while the peak at 300 nm corresponded to the n-π* transitions of carbonyl (C=O) groups [25,37] and both can be bathochromically shifted by conjugation [38]. Both peaks were characteristic of graphite oxide, indicating that the oxidative process was effective, in good agreement with the FTIR analysis.…”

Section: Oxidation Processsupporting

confidence: 76%

“…An increase in the interplanar distance was observed when comparing pure graphite with oxidized samples. These results suggested that the interplanar distance increased as a consequence of the insertion of functional groups containing oxygen and water molecules between the graphene oxide layers [34,37]. According to the results, it was concluded that the oxidation process was carried out satisfactorily and that the GO30 sample presented a higher degree of oxidation.…”

Section: Oxidation Processmentioning

confidence: 91%

“…The intensity of the peak at 26.63 • was the highest for the sample centrifuged at 1000 rpm and almost disappeared in sample GO30L-4000. This decrease in the intensity of the main peak corresponding to the plane (002) is related to a high level of exfoliation and disorder between GO flakes [37]. The distance between graphene oxide flakes, calculated according to Equation (2), increased with the centrifugation rate (Table 4).…”

Section: Exfoliation and Size Selection Of Graphene Oxidementioning

confidence: 94%

“…XRD patterns of graphite, GO15, and GO30 samples are shown in Figure 4. The XRD pattern of graphite structure showed a pronounced peak at 2θ = 26.63 • , corresponding to the (002) plane of graphite [46] and taken as indicative of pure graphite [37]. This peak, although with lower intensity, also appeared in GO15 and GO30 samples, suggesting that total oxidation was not achieved.…”

Section: Oxidation Processmentioning

confidence: 99%

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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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Section: Oxidation Processsupporting

confidence: 76%

Section: Oxidation Processmentioning

confidence: 91%

Section: Exfoliation and Size Selection Of Graphene Oxidementioning

confidence: 94%

Section: Oxidation Processmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2020

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“…After this reaction, the unreacted amino functional groups on CDs were free to react with other GO sheets, causing precipitation in the aqueous solution (Figure 2b). Subsequently, the CDs/GO composite was reduced via a reduction reaction in hydrogen dielectric barrier discharge (DBD) plasma to produce the CDs/rGO composite, written CDs/rGO (5:1), in order to improve graphene’s electrical conductivity [31,32,33]. FTIR spectroscopy was used to characterize the reaction and reduction processes, as shown in Figure 2c.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors

et al. 2016

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There is much recent interest in graphene-based composite electrode materials because of their excellent mechanical strengths, high electron mobilities, and large specific surface areas. These materials are good candidates for applications in supercapacitors. In this work, a new graphene-based electrode material for supercapacitors was fabricated by anchoring carbon dots (CDs) on reduced graphene oxide (rGO). The capacitive properties of electrodes in aqueous electrolytes were systematically studied by galvanostatic charge-discharge measurements, cyclic voltammetry, and electrochemical impedance spectroscopy. The capacitance of rGO was improved when an appropriate amount of CDs were added to the material. The CD/rGO electrode exhibited a good reversibility, excellent rate capability, fast charge transfer, and high specific capacitance in 1 M H2SO4. Its capacitance was as high as 211.9 F/g at a current density of 0.5 A/g. This capacitance was 74.3% higher than that of a pristine rGO electrode (121.6 F/g), and the capacitance of the CD/rGO electrode retained 92.8% of its original value after 1000 cycles at a CDs-to-rGO ratio of 5:1.

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Biomass Carbon Materials for Efficient Solar Steam Generation Prepared from Carbonized Enteromorpha Prolifera

et al. 2019

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Solar steam generation is a promising technique using solar energy to obtain fresh water from seawater, industrial waste water, or sewage. In the current work, a green‐tide waste, enteromorpha prolifera (EP), is used as raw material to prepare efficient absorbers and light‐to‐heat converters for solar steam generation. The EP waste is treated by a one‐step carbonization process to produce carbonaceous EP foam that exhibits strong absorption in a wide spectrum from ultraviolet to near‐infrared regions. The carbonaceous EP foam shows a solar steam generation efficiency of 89% under 5‐sun irradiation. The hydrophilic surface characteristics, highly porous structure, and long‐range continuous channels of the carbonaceous EP foam enable fast water transport and sufficient water supply for solar evaporation. Fresh water recovered from seawater and dye wastewater completely meets with the standards of drinking water. The strategy can not only reduce the cost of solar steam generation materials but also enable large‐scale application.

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Self-propagating solar light reduction of graphite oxide in water

Cited by 25 publications

References 53 publications

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

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

Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors

Biomass Carbon Materials for Efficient Solar Steam Generation Prepared from Carbonized Enteromorpha Prolifera

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