Visible‐Light‐Activated Black Organotitanias: How Synthetic Conditions Influence Their Structure and Photocatalytic Activity

Jiménez‐López, Jesús; Linares, Noemi; Serrano, Elena; García‐Martínez, Javier

doi:10.1002/cplu.201800054

Cited by 5 publications

(22 citation statements)

References 68 publications

(105 reference statements)

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“…2.24 eV vs. NHE). [29][30][31] We found a shift to higher binding energies (ca. 0.42 eV) in the VB maximum energy of the hybrid TiO 2 (B,R)-Phen, which agree with both the anatase-to-rutile transition 54,56,59 and also to the energy level N2p due to the Phen incorporation -Fig.…”

Section: Synthesis and Characterization Of Hybrid Titania-phenanthroline Organotitaniasmentioning

confidence: 75%

“…The synthesis of the hybrid TiO 2 (B,R)-Phen organotitanias was carried out following our previously described methodology. [29][30][31] First, a complex between the titania precursor, in this case, tetrabutyl orthotitanate (TBOT), and Phen was directly synthesized in absolute ethanol at room temperature -Scheme 1,i, right. Second, the TBOT-Phen complex was the organotitania precursor for the synthesis of the TiO 2 (B,R)-Phen by its hydrolysis at room temperature and further crystallization at 100 °C -Scheme 1,ii, right.…”

Section: Synthesis and Characterization Of Hybrid Titania-phenanthroline Organotitaniasmentioning

confidence: 99%

“…S2. 30 . In addition, the thermal degradation of Phen is delayed due to their incorporation into the titania structure -see inset in Fig.…”

Section: Synthesis and Characterization Of Hybrid Titania-phenanthroline Organotitaniasmentioning

confidence: 99%

“…(Left) Synthesis of the unmodified anatase titania, TiO2(A), starting from tetrabutyl orthotitanate (TBOT). [29][30][31] (Right) Schematic illustration of the synthesis of the hybrid TiO2(B,R)-Phen organotitanias with binary brookite/rutile crystalline phases, starting from TBOT and 1,10-phenanthroline (Phen), using the same conditions, and the proposed TiO2(B,R)-Phen structure.…”

Section: Introductionmentioning

confidence: 99%

“…[32][33][34] For instance, physical blends of titania nanoroads with Phen promotes the reduction of the recombination rate at the interface, significantly enhancing the efficiency in inverted organic solar cells (OSC). 33 In view of the above-mentioned, we took advantage of our expertise in the in-situ incorporation of organic and coordination compounds into the anatase structure [29][30][31]35 to investigate the effect of incorporating Phen into the titania structure during their sol-gel synthesis, using mild conditions and low temperatures. Two aspects warrant a significant impact of the work at hand.…”

Section: Introductionmentioning

confidence: 99%

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The use of N^N ligands as an alternative strategy for the sol–gel synthesis of visible-light activated titanias

et al. 2020

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Section: Synthesis and Characterization Of Hybrid Titania-phenanthroline Organotitaniasmentioning

confidence: 75%

Section: Synthesis and Characterization Of Hybrid Titania-phenanthroline Organotitaniasmentioning

confidence: 99%

“…S2. 30 . In addition, the thermal degradation of Phen is delayed due to their incorporation into the titania structure -see inset in Fig.…”

Section: Synthesis and Characterization Of Hybrid Titania-phenanthroline Organotitaniasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The use of N^N ligands as an alternative strategy for the sol–gel synthesis of visible-light activated titanias

et al. 2020

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Hybrid Amino Acid‐TiO₂ Materials with Tuneable Crystalline Structure and Morphology for Photocatalytic Applications

Sarigul

Chamorro-Mena

Linares

et al. 2021

Advanced Sustainable Systems

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TiO 2 (A), presents remarkable properties under UV light, which are very useful in photo-oxidation reactions. Some of these are, its chemical stability, low cost, availability, and low toxicity. [2] However, as it is widely known, it presents limited photoactivity under visible light. We have recently described a novel strategy, based on the in situ incorporation of organic moieties or metallic complexes during the synthesis of titania, which drastically enhances its photocatalytic efficiency under sunlight irradiation. [3][4][5][6] By using this strategy, a series of visible light-activated hybrid anatase nanoparticles have been produced by the in situ incorporation of organic compounds such as p-phenylenediamime, as well as Ru(II) or Ir(III) complexes, among others, to titania, using water and ethanol as solvents. [3][4][5] This methodology yields materials with a reduced band gap, absorption edges in the visible light, and outstanding stability; all of these features synergistically contributing to enhancing their photoactivity. [3][4][5][6] Furthermore, the integration of our hybrid titania containing the Ru(II) N3 dye into a photoelectrode of a low-temperature dye-sensitized solar cells (lt-DSSC) yielded the highest efficiency reported to date for titania-based lt-DSSCs (8.75%). [7] Very recently, we have reported the first biphasic rutilebrookite organotitania nanoparticles synthesized under mild conditions using 1,10-phenanthroline as both crystal modifier and as a source of intermediate N2p levels. Owing to these features, the hybrid organotitanias exhibit outstanding photocatalytic activity under visible light irradiation. [6] In light of these results, we decided to extend our approach to other morphologies and synthetic conditions, by incorporating other organic compounds. In this contribution, we report the synthesis, characterization, and catalytic testing of a series of hybrid amino acid-titania anatase nanoparticles and rutile nanorods with enhanced photo catalytic activity under visible light irradiation.Amino acids can be effectively incorporated in titania by coordinating their amine and carboxylic groups to the titanium atom of the titania precursor. [8,9] In fact, different amino acids have been used as shape-modifiers in the synthesis of brookite and rutile titanias, prepared with titanium metal powder and ammonia solutions. [8] The photodeposition of Pt co-catalyst on the surface of the as-synthesized brookite particles led A method to produce hybrid organotitanias, both as thin films and suspensions, showing excellent photocatalyic activity in the degradation of organic dyes in aqueous solutions under visible light irradiation is disclosed. This method is based on the in situ incorporation of an amino acid, l-tyrosine, during the synthesis of the titanias owing to its coordination and co-condensation with the titania precursor under acidic conditions. This methodology allows the fine -tuning of their crystalline structure, size, and shape by simply varying the pH of the synthesis gel, leadi...

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Solar-Driven Photocatalytic Films: Synthesis Approaches, Factors Affecting Environmental Activity, and Characterization Features

et al. 2022

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Solar-powered photocatalysis has come a long way since its humble beginnings in the 1990s, producing more than a thousand research papers per year over the past decade. In this review, immobilized photocatalysts operating under sunlight are highlighted. First, a literature review of solar-driven films is presented, along with some fundamental operational differences in relation to reactions involving suspended nanoparticles. Common strategies for achieving sunlight activity from films are then described, including doping, surface grafting, semiconductor coupling, and defect engineering. Synthetic routes to fabricate photocatalytically active films are briefly reviewed, followed by the important factors that determine solar photocatalysis efficiency, such as film thickness and structure. Finally, some important and specific characterization methods for films are described. This review shows that there are two main challenges in the study of photocatalytic materials in the form of (thin) films. First, the production of stable and efficient solar-driven films is still a challenge that requires an integrated approach from synthesis to characterization. The second is the difficulty in properly characterizing films. In any case, the research community needs to address these, as solar-driven photocatalytic films represent a viable option for sustainable air and water purification.

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Visible‐Light‐Activated Black Organotitanias: How Synthetic Conditions Influence Their Structure and Photocatalytic Activity

Cited by 5 publications

References 68 publications

The use of N^N ligands as an alternative strategy for the sol–gel synthesis of visible-light activated titanias

The use of N^N ligands as an alternative strategy for the sol–gel synthesis of visible-light activated titanias

Hybrid Amino Acid‐TiO₂ Materials with Tuneable Crystalline Structure and Morphology for Photocatalytic Applications

Solar-Driven Photocatalytic Films: Synthesis Approaches, Factors Affecting Environmental Activity, and Characterization Features

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Visible‐Light‐Activated Black Organotitanias: How Synthetic Conditions Influence Their Structure and Photocatalytic Activity

Cited by 5 publications

References 68 publications

The use of N^N ligands as an alternative strategy for the sol–gel synthesis of visible-light activated titanias

The use of N^N ligands as an alternative strategy for the sol–gel synthesis of visible-light activated titanias

Hybrid Amino Acid‐TiO2 Materials with Tuneable Crystalline Structure and Morphology for Photocatalytic Applications

Solar-Driven Photocatalytic Films: Synthesis Approaches, Factors Affecting Environmental Activity, and Characterization Features

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Hybrid Amino Acid‐TiO₂ Materials with Tuneable Crystalline Structure and Morphology for Photocatalytic Applications