Preparation of TiO<sub>2</sub>-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO<sub>2</sub>reduction

Camarillo, Rafael; Tostón, Susana; Martínez, Fabiola; Jiménez, Carlos; Rincón, Jesusa

doi:10.1002/jctb.5169

Cited by 32 publications

(49 citation statements)

References 58 publications

(160 reference statements)

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“…In our earlier studies, in order to increase the yield of the CO 2 photocatalytic reduction, TiO 2 ‐based nanoparticles were synthesized in supercritical medium . In principle, supercritical fluid properties allow facile control of the catalyst characteristics that will be important for its final application .…”

Section: Introductionmentioning

confidence: 99%

“…One result with specific interest for the synthesis in supercritical medium is that, like other thermal treatments, it leads to nonstoichiometric photocatalyst showing defect orders: oxygen vacancies (V O ) and titanium interstitials (Ti 3+ ) , . Both Ti 3+ and V O are important sites for adsorption and activation of reactants.…”

Section: Introductionmentioning

confidence: 99%

“…Electrons stored in V O are spontaneously transferred to CO 2 (even in the absence of light), forming the intermediate species ·CO 2 ‐ and CO. These oxygen vacancies (V O ) and titanium interstitials (Ti 3+ ) also introduce intermediate surface states that narrow the band gap, increasing the photoresponse to visible light, and promoting charge separation and transfer.…”

Section: Introductionmentioning

confidence: 99%

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Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Camarillo

Tostón

Martínez

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND In previous studies the enhanced activity of TiO2‐based catalysts synthesized in supercritical medium for photocatalytic reduction of CO2 was proved. RESULTS In this study, Cu/TiO2 photocatalysts were synthesized by hydrothermal methods in supercritical CO2. Two titanium precursors [titanium tetraisopropoxide and diisopropoxititanium bis(acetylacetonate)], two alcohols (ethanol and isopropyl alcohol), and one metal precursor (Cu (II) acetylacetonate) were used in the synthesis. Catalysts produced showed improved properties in comparison with the commercial reference catalyst (Degussa P‐25, Evonik). CONCLUSIONS Specifically, it has been found that Cu/TiO2 catalysts may yield methane production rates 20 times larger than that of commercial TiO2 catalyst without diminishing CO production rate (about 5 times higher than that of commercial catalyst). This result has been mainly imputed to both the formation of oxygen vacancies during the synthesis in supercritical medium and the high capacity of copper to adsorb and activate CO2 molecules, while preventing CO molecules from reoxidation, and avoiding the competitive reaction of hydrogen formation. © 2017 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Camarillo

Tostón

Martínez

et al. 2017

J of Chemical Tech & Biotech

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“…

fields. [8][9][10][11][12][13][14] TiO 2 has widely been utilized for photocata lytic CO 2 reduction owing to its stability, nontoxicity, and earth abundance, [15][16][17][18][19][20] but suffers from rapid recombination of electronhole pairs [21][22][23] and large bandgap. [1][2][3][4][5][6][7] This approach can recycle CO 2 back to rene wable fuels by using solar energy which is green and inexhaustible.

…”

mentioning

confidence: 99%

1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction

Zhu

Cheng

et al. 2018

Advanced Optical Materials

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fields. Photocatalytic CO 2 reduction over photocatalysts is a promising approach to overcome these two crises. [1][2][3][4][5][6][7] This approach can recycle CO 2 back to rene wable fuels by using solar energy which is green and inexhaustible. [8][9][10][11][12][13][14] TiO 2 has widely been utilized for photocata lytic CO 2 reduction owing to its stability, nontoxicity, and earth abundance, [15][16][17][18][19][20] but suffers from rapid recombination of electronhole pairs [21][22][23] and large bandgap. [24][25][26] Some strategies were developed to improve the photocata lytic performance including noble metal deposition, [27][28][29][30] doping, [31,32] surface photosensitization, [33,34] and constructing heterojunctions. [35][36][37][38][39] Among them, coupling TiO 2 with narrowband semi conductors is regarded as an efficient way to enhance separation of electron-hole pairs and promote light absorption, such as CdSe, [40,41] CdTe, [42,43] MoS 2 , [44][45][46][47] and CdS. [48][49][50] As a family member of the 2D materials family, transition metal dichal cogenides (TMDs) have recently attracted much attention owing to their remark able optical and electronic properties. As a typical TMD material, MoS 2 has been the subject of a large amount of research in electronic devices, electrochemistry and photocatalysis. [51][52][53][54] MoS 2 has a narrow bandgap around 1.2 eV and its conduction band (CB) level can be facilely adjusted by altering its number of layers due to quantum confinement, [55,56] which makes MoS 2 a highly promising sensitizer for photocatalysis processes, such as hydrogen evolution and CO 2 reduction. Recently, TiO 2 /MoS 2 has been reported for photocatalytic oxidation, photocatalytic H 2 pro duction, and photovoltaics, however, photocatalytic CO 2 con version to solar fuels over fibrous TiO 2 /MoS 2 has barely been reported.Herein, 1D/2D TiO 2 /MoS 2 hybrid nanofibers have been prepared by in situ growing MoS 2 nanosheets onto TiO 2 nanofibers. Such hybrid nanofibers exhibit abundantly porous structure, improved light absorption, and enhanced charge separation over photoexcitation. Therefore, the 1D/2D hybrid shows a superior photocatalytic activity for photoreducing CO 2 into hydrocarbons under UV-visible light irradiation. The synergistic effect of MoS 2 deposition onto TiO 2 fiber is analyzed and discussed in detail to understand the photocatalytic mechanism.Photocatalytic reduction of CO 2 into solar fuels is recognized an attractive approach to solve the environmental and energy crisis. MoS 2 , a type of 2D transition metal dichalcogenides, has attracted significant attention in photoelectronics, sensors and photo/electrocatalytic water splitting owing to its remarkable properties. Nevertheless, to date, MoS 2 is barely used as (co)catalyst for CO 2 photoreduction. Herein, novel 1D/2D TiO 2 /MoS 2 nanostructured hybrid with TiO 2 fibers covered by MoS 2 nanosheets by hydrothermal transformation method is fabricated. The MoS 2 sheet arrays show a lateral size of ≈80 nm and a thickness...

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“…Therefore it is possible to obtain similar results minimising the primary energy input. [73,74], while Tan and co-workers reported a miximum 3.14 μmol gcat −1 after eight hour reactions with graphene oxide-modified TiO2 [75], and Ola and Maroto-Valer reached 4.87 μmol gcat −1 by means of a V-TiO2 photocatalyst [76]. Compared to cited works, reaction conditions here are considerably milder, particularly in terms of irradiance; in fact, they are in cited paper irradiance ranges from 500 to 3000 W•m −2 , whilst here irradiance is 50 W•m −2 .…”

Section: On the Reactor Designmentioning

confidence: 99%

Sustainable Carbon Dioxide Photoreduction by a Cooperative Effect of Reactor Design and Titania Metal Promotion

et al. 2018

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An effective process based on the photocatalytic reduction of CO 2 to face on the one hand, the crucial problem of environmental pollution, and, on the other hand, to propose an efficient way to product clean and sustainable energy sources has been developed in this work. Particular attention has been paid to the sustainability of the process by using a green reductant (water) and TiO 2 as a photocatalyst under very mild operative conditions (room temperature and atmospheric pressure). It was shown that the efficiency in carbon dioxide photoreduction is strictly related to the process parameters and to the catalyst features. In order to formulate a versatile and high performing catalyst, TiO 2 was modified by oxide or metal species. Copper (in the oxide CuO form) or gold (as nanoparticles) were employed as promoting metal. Both photocatalytic activity and selectivity displayed by CuO-TiO 2 and Au-TiO 2 were compared, and it was found that the nature of the promoter (either Au or CuO) shifts the selectivity of the process towards two strategic products: CH 4 or H 2 . The catalytic results were discussed in depth and correlated with the physicochemical features of the photocatalysts.

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Preparation of TiO₂-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO₂reduction

Cited by 32 publications

References 58 publications

Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction

Sustainable Carbon Dioxide Photoreduction by a Cooperative Effect of Reactor Design and Titania Metal Promotion

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Preparation of TiO2-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO2reduction

Cited by 32 publications

References 58 publications

Improving the photo‐reduction of CO2 to fuels with catalysts synthesized under high pressure: Cu/TiO2

Improving the photo‐reduction of CO2 to fuels with catalysts synthesized under high pressure: Cu/TiO2

1D/2D TiO2/MoS2 Hybrid Nanostructures for Enhanced Photocatalytic CO2 Reduction

Sustainable Carbon Dioxide Photoreduction by a Cooperative Effect of Reactor Design and Titania Metal Promotion

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Preparation of TiO₂-based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO₂reduction

Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

Improving the photo‐reduction of CO₂ to fuels with catalysts synthesized under high pressure: Cu/TiO₂

1D/2D TiO₂/MoS₂ Hybrid Nanostructures for Enhanced Photocatalytic CO₂ Reduction