Directed modification of carbons of varied origin and chemical nature of the surface in order to control their catalytic activity

Strelko, V. V.; Stavitskaya, S. S.; Tsyba, N. N.; Лысенко, А. А.; Zhuravskii, S. V.; Goba, V. E.

doi:10.1134/s107042720703010x

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…For example, the H 2 O 2 decomposition rate achieved when using AC as catalyst is the highest amongst the three materials at pH = 3; but the same material presents the lowest H 2 O 2 decomposition rate when the pH is increased. This observation, together with the behaviours of ACS and ACNUT in this study, contradicts the explanation which considers that H 2 O 2 decomposition is mainly due to its dissociation as weak acid, favoured at higher pH, as reported in previous works [43,44]. In face of this theory, it would be reasonable to expect that the behaviour of the catalysts would be a direct consequence of their PZC [29,35].…”

Section: Influence Of Operating Conditionscontrasting

confidence: 95%

“…This order is in accordance with the concentration of basic active sites at the surface of the materials (cf. Table 2), suggesting that the basicity of carbon materials increases the yield of HO • formation, which may be explained by the reducing character of basic groups, necessary condition for the promotion of the reaction described by Equation 2, which is in line with other results published in literature [35,44,58]. This relationship is clearly visible when Y HO • is plotted against the concentration of basic active sites at the surface of the carbon materials (cf.…”

Section: Mechanistic Interpretation Of H 2 O 2 Decompositionsupporting

confidence: 88%

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The influence of structure and surface chemistry of carbon materials on the decomposition of hydrogen peroxide

Ribeiro

Silva

Figueiredo

et al. 2013

Carbon

115

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Carbon materials with different structural and chemical properties, namely activated carbons, carbon xerogels, carbon nanotubes, graphene oxide, graphite and glycerol-based carbon materials, were tested under different operating conditions for their ability to catalyse hydrogen peroxide (H 2 O 2 ) decomposition in aqueous solutions. Activated carbons treated with concentrated sulphuric acid (ACS) are the most active catalytic materials for H 2 O 2 decomposition in most of the conditions studied, due to the presence of sulphur containing functional groups at their surface. In addition, ACS proved to be a stable catalyst in reutilization tests for H 2 O 2 decomposition. Methanol was used as selective scavenger of hydroxyl radicals (HO • ), to show that activated carbons with a markedly basic character lead to the highest yield of HO • formed during the H 2 O 2 decomposition process (14%, after 150 min of reaction). Overall, from the mechanistic interpretation of H 2 O 2 decomposition, it is concluded that the presence of sulphur containing functional groups at the surface of the activated carbons improves the removal of H 2 O 2 in aqueous solutions, but, on the other hand, the selective decomposition of H 2 O 2 via HO • formation is enhanced by the presence of basic active sites on the carbon surface.

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Section: Influence Of Operating Conditionscontrasting

confidence: 95%

Section: Mechanistic Interpretation Of H 2 O 2 Decompositionsupporting

confidence: 88%

The influence of structure and surface chemistry of carbon materials on the decomposition of hydrogen peroxide

Ribeiro

Silva

Figueiredo

et al. 2013

Carbon

115

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“…Since the report of Lücking et al [91], very distinct materials such as activated carbons [6,7,39,46,47,72,88,129,171,[176][177][178], graphite [61,66,81,91,122,177], carbon nanotubes [59,65,83,103], carbon blacks [66,177], carbon aerogels [41], activated carbon xerogels [38], glycerol-based carbon materials [104], graphene-based materials [34,62,107] and others [81,111], have been reported as active and efficient catalysts for CWPO. The most significant findings will be discussed in detail in the following Section.…”

Section: Tablementioning

confidence: 99%

“…during CWPO processes [6,7,91,160,166,171]. Among these, the presence of basic nitrogencontaining groups has been related with increased rates of H2O2 decomposition [178,179].…”

Section: Basic Active Sitesmentioning

confidence: 99%

Catalytic wet peroxide oxidation: a route towards the application of hybrid magnetic carbon nanocomposites for the degradation of organic pollutants. A review

Ribeiro

Silva

Figueiredo

et al. 2016

Applied Catalysis B: Environmental

159

102

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Several motivations have prompted the scientific community towards the application of hybrid magnetic carbon nanocomposites in catalytic wet peroxide oxidation (CWPO) processes. The most relevant literature on this topic is reviewed, with a special focus on the synergies that can arise from the combination of highly active and magnetically separable iron species with the easily tuned properties of carbon-based materials. These are mainly ascribed to increased adsorptive interactions, to good structural stability and low leaching levels of the metal species, and to increased regeneration and dispersion of the active sites, which are promoted by the presence of the carbon-based materials in the composites.The most significant features of carbon materials that may be further explored in the design of improved hybrid magnetic catalysts are also addressed, taking into consideration the experimental knowledge gathered by the authors in their studies and development of carbonbased catalysts for CWPO. The presence of stable metal impurities, basic active sites and sulphur-containing functionalities, as well as high specific surface area, adequate porous texture, adsorptive interactions and structural defects, are shown to increase the activity of carbon materials when applied in CWPO, while the presence of acidic oxygen-containing functionalities has the opposite effect.

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“…The high content of heteroatoms such as nitrogen or oxygen provides to the material a series of acid, basic or oxide-reducing features [6].…”

Section: Introductionmentioning

confidence: 99%

Chemical Characterization of Sub-Bituminous Coal From the Arauco Province - Chile

Méndez

Rivera

Pino

et al. 2016

J. Chil. Chem. Soc.

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The chemical and sorptive characteristics of mineral coals extracted from a mine in Lebu (Biobío Region, Chile) and its derivatives were studied. These derivatives were obtained by applying a thermal treatment in an environment with N 2 and CO 2 at different experimental conditions, in order to increase their specific surface. In addition, coals were characterized by using proximal analysis, elementary analysis and petrographic analysis. In order to know their structure and surface, Boehm titration analysis, FTIR infrared spectroscopy, X-ray diffraction and scanning electron microscopy were performed. The surface of the selected carbons was modified by selectively oxidizing it with (NH 4 ) 2 S 4 O 8 and with H 2 O 2 e impregnating with an iron solution for the study with H 2 O 2 In the oxidation of H 2 O 2 , the work was carried out at different pH. The results show a moderate homogeneity between different types of seams studied, whereas when coals are treated with heat or strong oxidants, increases its surface and can be used with analytical applications (v.g. electroanalytical sensors).

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Directed modification of carbons of varied origin and chemical nature of the surface in order to control their catalytic activity

Cited by 4 publications

References 3 publications

The influence of structure and surface chemistry of carbon materials on the decomposition of hydrogen peroxide

The influence of structure and surface chemistry of carbon materials on the decomposition of hydrogen peroxide

Catalytic wet peroxide oxidation: a route towards the application of hybrid magnetic carbon nanocomposites for the degradation of organic pollutants. A review

Chemical Characterization of Sub-Bituminous Coal From the Arauco Province - Chile

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