Nanostructured Systems Obtention Using LbL Self-Assembly or the Cysteine-Assisted Adsorption Method and Their Application as a Water Splitting Single Catalyst

Galvão, Rhauane A.; Barreto, Paloma Bantim; Soares, Thiago André Salgueiro; Sales, Letícia B. V.; Santos, Jeice M. dos; Santa-Cruz, Larissa A.; Seeger, Tassia S.; Duarte, Fábio A.; Silva, Germana M.M.; Machado, Giovanna

doi:10.21577/0103-5053.20190176

“…Heterogeneous photocatalysis has proving to be a good alternative. Studies have shown its effectiveness in environmental remediation of contaminated waters (Machado et al, 2008;França et al, 2016;Hurtado, Sader & Delgado, 2019), as well as in hydrogen production (H 2 ), an important energy vector (Bahnemann & Schneider, 2013;Rusinque, Escobedo & Lasa, 2020;Galvão et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "Characterization and evaluation of the photocatalytic activity of oxides based on TiO2 synthesized by hydrolysis controlled by the use of water/acetone mixtures (v0.1)"

2020

0

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New photocatalysts based on TiO 2 were synthesized and characterized. The synthesis involved the controlled hydrolysis of titanium tetraisopropoxide using water containing different proportions of acetone. X-ray diffraction analyses combined with Raman spectroscopy revealed crystalline oxides characterized by the coexistence of the anatase and brookite phases. The Rietveld refinement of diffractograms showed that the presence of acetone in the synthesis process influenced the composition of these crystalline phases, with the proportion of brookite growing from 13 to 22% with the addition of this solvent in the synthesis process. The BET isotherms revealed that these materials are mesoporous with surface area approximately 12% higher than that of the oxide prepared from hydrolysis using pure water. The photocatalytic potential of these oxides was evaluated by means degradation tests using the dyes Ponceau 4R and Reactive Red 120 as oxidizable substrates. The values achieved using the most efficient photocatalyst among the synthesized oxides were, respectively, 83% and 79% for mineralization, and 100% for discoloration of these dyes. This same oxide loaded with 0.5% of platinum and suspended in a 5:1 v/v water/methanol mixture, produced 56 mmol of gaseous hydrogen in five hours of reaction, a specific hydrogen production rate of 138.5 mmol h-1 g-1 , a value 60% higher than that achieved using TiO 2 P25 under similar conditions.

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“…Heterogeneous photocatalysis has proving to be a good alternative. Studies have shown its effectiveness in environmental remediation of contaminated waters (Machado et al, 2008;França et al, 2016;Hurtado, Sader & Delgado, 2019), as well as in hydrogen production (H 2 ), an important energy vector (Bahnemann & Schneider, 2013;Rusinque, Escobedo & Lasa, 2020;Galvão et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Peer Review #2 of "Characterization and evaluation of the photocatalytic activity of oxides based on TiO2 synthesized by hydrolysis controlled by the use of water/acetone mixtures (v0.1)"

2020

0

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New photocatalysts based on TiO 2 were synthesized and characterized. The synthesis involved the controlled hydrolysis of titanium tetraisopropoxide using water containing different proportions of acetone. X-ray diffraction analyses combined with Raman spectroscopy revealed crystalline oxides characterized by the coexistence of the anatase and brookite phases. The Rietveld refinement of diffractograms showed that the presence of acetone in the synthesis process influenced the composition of these crystalline phases, with the proportion of brookite growing from 13 to 22% with the addition of this solvent in the synthesis process. The BET isotherms revealed that these materials are mesoporous with surface area approximately 12% higher than that of the oxide prepared from hydrolysis using pure water. The photocatalytic potential of these oxides was evaluated by means degradation tests using the dyes Ponceau 4R and Reactive Red 120 as oxidizable substrates. The values achieved using the most efficient photocatalyst among the synthesized oxides were, respectively, 83% and 79% for mineralization, and 100% for discoloration of these dyes. This same oxide loaded with 0.5% of platinum and suspended in a 5:1 v/v water/methanol mixture, produced 56 mmol of gaseous hydrogen in five hours of reaction, a specific hydrogen production rate of 138.5 mmol h-1 g-1 , a value 60% higher than that achieved using TiO 2 P25 under similar conditions.

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Characterization and evaluation of the photocatalytic activity of oxides based on TiO₂ synthesized by hydrolysis controlled by the use of water/acetone mixtures

Machado

¹

,

Machado

²

2020

PeerJ Materials Science

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New photocatalysts based on TiO2 were synthesized and characterized. The synthesis involved the controlled hydrolysis of titanium tetraisopropoxide using water containing different proportions of acetone. X-ray diffraction analyses combined with Raman spectroscopy revealed crystalline oxides characterized by the coexistence of the anatase and brookite phases. The Rietveld refinement of diffractograms showed that the presence of acetone in the synthesis process influenced the composition of these crystalline phases, with the proportion of brookite growing from 13% to 22% with the addition of this solvent in the synthesis process. The BET isotherms revealed that these materials are mesoporous with surface area approximately 12% higher than that of the oxide prepared from hydrolysis using pure water. The photocatalytic potential of these oxides was evaluated by means degradation tests using the dyes Ponceau 4R and Reactive Red 120 as oxidizable substrates. The values achieved using the most efficient photocatalyst among the synthesized oxides were, respectively, 83% and 79% for mineralization, and 100% for discoloration of these dyes. This same oxide loaded with 0.5% of platinum and suspended in a 5:1 v/v water/methanol mixture, produced 56 mmol of gaseous hydrogen in 5 h of reaction, a specific hydrogen production rate of 138.5 mmol h−1g−1, a value 60% higher than that achieved using TiO2 P25 under similar conditions.

show abstract

Nanostructured Systems Obtention Using LbL Self-Assembly or the Cysteine-Assisted Adsorption Method and Their Application as a Water Splitting Single Catalyst

Cited by 3 publications

References 16 publications

Peer Review #1 of "Characterization and evaluation of the photocatalytic activity of oxides based on TiO2 synthesized by hydrolysis controlled by the use of water/acetone mixtures (v0.1)"

Peer Review #1 of "Characterization and evaluation of the photocatalytic activity of oxides based on TiO2 synthesized by hydrolysis controlled by the use of water/acetone mixtures (v0.1)"

Peer Review #2 of "Characterization and evaluation of the photocatalytic activity of oxides based on TiO2 synthesized by hydrolysis controlled by the use of water/acetone mixtures (v0.1)"

Characterization and evaluation of the photocatalytic activity of oxides based on TiO₂ synthesized by hydrolysis controlled by the use of water/acetone mixtures

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