Cation-containing active carbons as photocatalysts for dyes degradation

Sydorchuk, V.; Khalameida, S.; Poddubnaya, O.I.; Tsyba, M.M.; Puziy, Alexander M.

doi:10.15407/hftp08.04.422

Cited by 1 publication

(3 citation statements)

References 42 publications

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“…As for room temperature, a proton binding isotherm of an oxidized carbon is known . This dependence corresponds to the

p K_{a}

distribution of acid sites that has a well‐defined peak at

p K_{a}

3, together with circa fourfold larger amount of acid sites around

p K_{a}

11.…”

Section: Theoreticalmentioning

confidence: 99%

“…Based on the acidity distribution curve of an oxidized carbon, in our calculations, we assume that the entire surface of an oxidized carbon SAC can be described with

p K_{a}

3. The peak at

p K_{a}

3 described in literature is believed to be sufficiently narrow to make this approximation of catalyst acidity quite reasonable.…”

Section: Theoreticalmentioning

confidence: 99%

“…Based on the acidity distribution curve of an oxidized carbon, in our calculations, we assume that the entire surface of an oxidized carbon SAC can be described with

p K_{a}

3. The peak at

p K_{a}

3 described in literature is believed to be sufficiently narrow to make this approximation of catalyst acidity quite reasonable. Furthermore, only the strongest acid sites of this acidity distribution

((), p K_{a} 3)

need to be considered because even at distance from the catalyst surface the calculated proton concentrations easily attain 10 −6 mol L −1 (as will be shown in Figure ); so, near‐catalyst proton concentrations are definitely high enough to wholly suppress the dissociation of weaker phenolic acid sites.…”

Section: Theoreticalmentioning

confidence: 99%

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Electrical Double Layer as a Model of Interaction between Cellulose and Solid Acid Catalysts of Hydrolysis

Tarabanko

Kukhtetskiy

et al. 2019

ChemPhysChem

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Solid acid catalysts of cellulose hydrolysis in aqueous media attract considerable research interest because of the ease of their separation from the reaction products. The nature of interaction between the two solids is a relevant topic of ongoing research. One aspect of behavior of solid acids in water was not previously discussed in literature with regard to hydrolysis of cellulose: electrolytic dissociation and formation of electric double layers. In this work, on theoretical level, we consider the role of the double layer created by the solid acid when cellulose hydrolysis takes place. The diffuse layer of protons is regarded as the medium where the hydrolysis reaction occurs. Protonation of cellulose by these protons imparts positive charge onto its surface, and cellulose is electrostatically attracted to the polyanion of the catalyst. Thus, the two solid surfaces stay close to each other despite Brownian motion; this allows explaining the high activity of solid catalysts even when chemisorption of carbohydrates on a catalyst is not favorable.

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“…As for room temperature, a proton binding isotherm of an oxidized carbon is known . This dependence corresponds to the

p K_{a}

distribution of acid sites that has a well‐defined peak at

p K_{a}

3, together with circa fourfold larger amount of acid sites around

p K_{a}

11.…”

Section: Theoreticalmentioning

confidence: 99%

“…Based on the acidity distribution curve of an oxidized carbon, in our calculations, we assume that the entire surface of an oxidized carbon SAC can be described with

p K_{a}

3. The peak at

p K_{a}

3 described in literature is believed to be sufficiently narrow to make this approximation of catalyst acidity quite reasonable.…”

Section: Theoreticalmentioning

confidence: 99%

“…Based on the acidity distribution curve of an oxidized carbon, in our calculations, we assume that the entire surface of an oxidized carbon SAC can be described with