New porphyrin/Cu(II) porphyrin-TiO2 nanohybrids for improved photocatalytic oxidation and reduction activities

Li, Zhonglu; Wang, Chen; Su, Zhenping; Zhang, Wei; Wang, Ning; Mele, Giuseppe; Li, Jun

doi:10.1016/j.matchemphys.2020.123228

Cited by 13 publications

(5 citation statements)

References 41 publications

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“…Furthermore, the C=O stretching vibration of H 4 TTFTB at 1696 cm −1 disappears, and two new bands appear at 1407 cm −1 and 1621 cm −1 in H 4 TTFTB-TiO 2 -5.0, which could be attributed to the symmetric and anti-symmetric stretch of -COO-. Thus, H 4 TTFTB should be chemically combined with TiO 2 through titanium ester bonds (O=C-O-Ti), which could also enhance the separation and transfer of photogenerated charges between H 4 TTFTB and Ti (3d) orbital manifold of a -TiO 2 [ 43 , 44 ]. Further, thermogravimetric analysis (TGA) of H 4 TTFTB and of H 4 TTFTB-TiO 2 -5.0 were carried out to evaluate their thermostability, revealing that the organic molecular H 4 TTFTB and the hybrid materials could be stable up to 300 °C ( Figure S10 ).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Hydrogen Production Activity by Constructing a Robust Organic-Inorganic Hybrid Material Based Fulvalene and TiO2

Wang

Zhong

et al. 2022

Nanomaterials

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A novel redox-active organic-inorganic hybrid material (denoted as H4TTFTB-TiO2) based on tetrathiafulvalene derivatives and titanium dioxide with a micro/mesoporous nanomaterial structure has been synthesized via a facile sol-gel method. In this study, tetrathiafulvalene-3,4,5,6-tetrakis(4-benzoic acid) (H4TTFTB) is an ideal electron-rich organic material and has been introduced into TiO2 for promoting photocatalytic H2 production under visible light irradiation. Notably, the optimized composites demonstrate remarkably enhanced photocatalytic H2 evolution performance with a maximum H2 evolution rate of 1452 μmol g−1 h−1, which is much higher than the prototypical counterparts, the common dye-sensitized sample (denoted as H4TTFTB-5.0/TiO2) (390.8 μmol g−1 h−1) and pure TiO2 (18.87 μmol g−1 h−1). Moreover, the composites perform with excellent stability even after being used for seven time cycles. A series of characterizations of the morphological structure, the photoelectric physics performance and the photocatalytic activity of the hybrid reveal that the donor-acceptor structural H4TTFTB and TiO2 have been combined robustly by covalent titanium ester during the synthesis process, which improves the stability of the hybrid nanomaterials, extends visible-light adsorption range and stimulates the separation of photogenerated charges. This work provides new insight for regulating precisely the structure of the fulvalene-based composite at the molecule level and enhances our in-depth fundamental understanding of the photocatalytic mechanism.

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Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Hydrogen Production Activity by Constructing a Robust Organic-Inorganic Hybrid Material Based Fulvalene and TiO2

Wang

Zhong

et al. 2022

Nanomaterials

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“…Furthermore, the peaks at 399.5 eV and 398.4 eV in the spectrum of N1s for H 2 Pp-TAPM in Figure 6b can be attributed to Schiff base N and pyrrole nitrogen, respectively. 35…”

Section: Xps Analysismentioning

confidence: 99%

“…33,34 However, relatively flexible building blocks can also be used to design and synthesize frame materials, which are of great significance in constructing large aperture and studying the construction mechanism of POP materials. 35,36 In flexible chain building blocks, high rotational degrees of freedom around individual bonds will strongly increase defects in crystal framework growth, 37 thus leading to a great challenge for the directed synthesis of crystalline POPs. Moreover, since flexible building blocks can adopt multiple conformations, it is more difficult to simulate the structure of POP materials from powder diffraction data based on reticular chemistry.…”

Section: Introductionmentioning

confidence: 99%

A porphyrin‐based porous organic polymer containing flexible chains for efficient heterogeneous photocatalysis

Wang,

Wei

et al. 2023

Applied Organom Chemis

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Porphyrin‐based porous organic polymers (Por‐POPs) are attracting increasing attention because of their potential in visible light photocatalysis. The distinctive attributes of Por‐POPs have been elucidated by investigating their response to specific reactions, such as the aerobic oxidation of sulfides. However, most researchers choose porphyrin molecules with relatively short peripheral substituent chains and strong stiffness to construct porphyrin‐based materials, especially Por‐POPS. Herein, we designed and prepared a flexible POP material H2Pp‐TAPM by incorporating extra π‐conjugated rigid units TAPM into a relatively flexible porphyrin monomer H2Pp through imine linkages. The POP synthesized in this study has demonstrated the ability to facilitate the transfer and dissociation of photogenerated electron–hole pairs, leading to the production of singlet oxygen 1O2 and superoxide radical anions O2˙−. These anions act as effective mediators for the selective aerobic oxidation of sulfides, resulting in the conversion of 99% and the selectivity more than 99%. Furthermore, the H2Pp‐TAPM has excellent stability and recyclability, indicating its attractiveness as heterogeneous photocatalyst for the transformation of organic compounds. This makes it a promising candidate for visible‐light‐driven reactions.

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“…NA exhibits a strong absorption peak at 1685 cm À 1 , attributed to the stretching vibration of C=O in NA materials. [14] In the hybrid material NAÀ TiO 2 , the peak at 3422 cm À 1 corresponds to the stretching vibration of the -OH bond in the adsorbed H 2 O on the material's surface, and the absorption peak at 500-800 cm À 1 was related to the TiÀ OÀ Ti stretching vibration in NAÀ TiO 2 . Additionally, new absorption peaks at 1625 cm À 1 and 1412 cm À 1 , distinct from the peaks of NA and TiO 2 emerge.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

A Calcination‐Free Sol‐Gel Method to Prepare TiO₂‐Based Hybrid Semiconductors for Enhanced Visible Light‐Driven Hydrogen Production

et al. 2023

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In recent years, the sol‐gel method has been extensively utilized to develop efficient and stable organic semiconductor composite titanium dioxide (TiO2) photocatalysts. However, the high‐temperature calcination requirements of this method consume energy during preparation and degrade encapsulated organic semiconductor molecules, resulting in decreased photocatalytic hydrogen production efficiency. In this study, we found that by selecting an appropriate organic semiconductor molecule, 1,4‐naphthalene dicarboxylic acid (NA), high‐temperature calcination can be avoided in the sol‐gel process, yielding an organic‐inorganic hybrid material with stable and effective photocatalytic properties. The uncalcined material displayed a hydrogen production rate of 2920±15 μmol g−1 h−1, which was approximately twice the maximum production rate observed in the calcined material. Likewise, the specific surface area of the uncalcined material, at 252.84 m2 g−1, was significantly larger compared to the calcined material. Comprehensive analyses confirmed successful NA and TiO2 doping, while UV‐vis and Mott‐Schottky tests revealed a reduced energy bandgap (2.1 eV) and expanded light absorption range. Furthermore, the material maintained robust photocatalytic activity after a 40‐hour cycle test. Our findings demonstrate that by using NA doping without calcination, excellent hydrogen production performance can be achieved, offering a novel approach for environmentally friendly and energy‐saving production of organic semiconductor composite TiO2 materials.

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New porphyrin/Cu(II) porphyrin-TiO2 nanohybrids for improved photocatalytic oxidation and reduction activities

Cited by 13 publications

References 41 publications

Enhanced Photocatalytic Hydrogen Production Activity by Constructing a Robust Organic-Inorganic Hybrid Material Based Fulvalene and TiO2

Enhanced Photocatalytic Hydrogen Production Activity by Constructing a Robust Organic-Inorganic Hybrid Material Based Fulvalene and TiO2

A porphyrin‐based porous organic polymer containing flexible chains for efficient heterogeneous photocatalysis

A Calcination‐Free Sol‐Gel Method to Prepare TiO₂‐Based Hybrid Semiconductors for Enhanced Visible Light‐Driven Hydrogen Production

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New porphyrin/Cu(II) porphyrin-TiO2 nanohybrids for improved photocatalytic oxidation and reduction activities

Cited by 13 publications

References 41 publications

Enhanced Photocatalytic Hydrogen Production Activity by Constructing a Robust Organic-Inorganic Hybrid Material Based Fulvalene and TiO2

Enhanced Photocatalytic Hydrogen Production Activity by Constructing a Robust Organic-Inorganic Hybrid Material Based Fulvalene and TiO2

A porphyrin‐based porous organic polymer containing flexible chains for efficient heterogeneous photocatalysis

A Calcination‐Free Sol‐Gel Method to Prepare TiO2‐Based Hybrid Semiconductors for Enhanced Visible Light‐Driven Hydrogen Production

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A Calcination‐Free Sol‐Gel Method to Prepare TiO₂‐Based Hybrid Semiconductors for Enhanced Visible Light‐Driven Hydrogen Production