Comparison of the adsorption of cationic blue onto graphene oxides prepared from natural graphites with different graphitization degrees

Jiao, Xuan; Zhang, Lingyan; Qiu, Yangshuai; Guan, Junfang

doi:10.1016/j.colsurfa.2017.05.094

Cited by 24 publications

(21 citation statements)

References 55 publications

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“…On the basis of the different crystalline morphologies, as well as the presence of oxygen-containing groups on the edges of the structural layers, there is a remarkable difference on the graphitization degree of natural graphites, which can be used to evaluate the development of the graphitic structure in various carbon materials. [22][23][24][25] The degree of graphitization, as a rule, is the extent to which a material approaches the ideal graphite structure, which can be distinguished using XRD and theoretical calculations based on the values of d 002 . As reported in the literature, numerous factors were found to affect the characteristics of rGO, such as the lateral size, 26 impurity content, 20 geographical origin 27 and various synthesis methods.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the characteristic properties of reduced graphene oxides synthesized from natural graphites with different graphitization degrees

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Comparison of the characteristic properties of reduced graphene oxides synthesized from natural graphites with different graphitization degrees

et al. 2017

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“…Besides, as shown in Figure 4b, the GO sheet can be characterized as nano-scale thin with large surface area for the attachment of oxygen functional groups. Thus, better dispersion of GO by means of ultra-sonication can effectively modify CaCl 2 ·6H 2 O [19]. Besides, Figure 3b shows the DSC results of modified CaCl 2 ·6H 2 O.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Jin

Tian

et al. 2018

Materials

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Although the inorganic salt hydrate phase change materials (PCMs) such as CaCl2·6H2O have promising potential for thermal energy storage in building application, the issue of supercooling has restricted their practical application. In this study, graphene oxide (GO) and SrCl2·6H2O as binary nucleation agents were used to modify CaCl2·6H2O and reduce its supercooling degree. Compared with pure CaCl2·6H2O, the incorporation of graphene oxide (GO)/SrCl2·6H2O reduced the supercooling degree to 0.3 °C significantly. In addition, the supercooling degree of modified CaCl2·6H2O after 200 thermal cycles was still much lower than that of non-modified CaCl2·6H2O. From the results of differential scanning calorimetry (DSC), the latent heat value and phase change temperature of the modified CaCl2·6H2O were 207.88 J/g and 27.6 °C, respectively. Aluminum capsules were used to encapsulate the modified PCM and placed inside the composite wallboard. The thermal performances of the composite wallboard with modified PCM were investigated using infrared thermography. Experimental results showed that the average temperature difference between the top and bottom surfaces of modified CaCl2·6H2O/wallboard composite after 1 h heating was kept around 15.8 °C, while it was 4.9 °C for the control wallboard. The above test results proved that the modified CaCl2·6H2O demonstrated good thermal performance and can be used in buildings to maintain thermal comfort.

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“…In addition, the peaks attributed to the deformation vibration of the tertiary C-OH groups appeared at 1400 cm −1 [38,82]. The peaks located at approximately 1225 and 1080 cm −1 correspond to the stretching vibrations of C-O-C and C-O, respectively [82][83][84][85]. Brag corresponding to peaks (1 1 0) and (2 0 0) at the mid-range of the 2-theta angle suggest that these materials have highly ordered hexagonal mesostructures in 2-D [79].…”

Section: Xrd and Ftir Analysis Of Samplesmentioning

confidence: 99%

Isosteric Heat: Comparative Study between Clausius–Clapeyron, CSK and Adsorption Calorimetry Methods

2019

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This work presents the calorimetric study of five adsorbents with different chemical and textural characteristics: MOF-199, MCM-41, SBA-15, activated carbon prepared from corn cob (GACKP) and graphite. These solids were used to establish the differences between isosteric heats evaluated by three different methods: Clausius–Clapeyron (C-C), Chakraborty, Saha and Koyama (CSK) and Adsorption Calorimetry (A-Cal). The textural characterization results show solids that have values of specific surface area between 2271 m2·g−1 for the MOF-199 and 5.2 m2·g−1 for the graphite. According to the results obtained for the isosteric heats for each sample, the magnitude varies depending on the coverage of the adsorbate and the textural characteristics of each adsorbent. Solids with an organized structure have isosteric heat values that are coincident among the three methods. Meanwhile, heterogeneous solids such as activated carbon values evaluated by the CKS and C-C have a high dispersion method regarding the adsorption calorimetry method. The results obtained show that the adsorption calorimetry, being a direct experimental measurement method, presents less dispersed data. At low quantities, the isosteric heat of nitrogen adsorption decreased in the order MOF-199, GACKP, MCM-41, SBA-15 and Graphite. The order for the isosteric heats values was coherent with the surface characteristics of each of the solids, especially with the pore size distribution. Finally, throughout the coverage examined in this work, the isosteric heats for nitrogen adsorption determined by adsorption calorimetry (A-Cal) were larger than the evaluated by C-C and CSK indirect methods of vaporization. According to the results, it is shown that the adsorption calorimetry allows values of the isosteric heats of adsorption with an error of less than 2% to be established and also reveals the complex nature of the heterogeneity or homogeneity of the adsorbent.

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Comparison of the adsorption of cationic blue onto graphene oxides prepared from natural graphites with different graphitization degrees

Cited by 24 publications

References 55 publications

Comparison of the characteristic properties of reduced graphene oxides synthesized from natural graphites with different graphitization degrees

Comparison of the characteristic properties of reduced graphene oxides synthesized from natural graphites with different graphitization degrees

Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

Isosteric Heat: Comparative Study between Clausius–Clapeyron, CSK and Adsorption Calorimetry Methods

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