TiO2 encapsulated in Salicylaldehyde-NH2-MIL-101(Cr) for enhanced visible light-driven photodegradation of MB

Li, Xiyi; Pi, Yunhong; Xia, Qibin; Li, Zhong; Xiao, Jing

doi:10.1016/j.apcatb.2016.03.034

Cited by 184 publications

(66 citation statements)

References 46 publications

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“…Therefore CUS can promote the redox reactions of MOFs with other substances and thus this topic is of particular importance in catalytic processes. Previous studies have shown that MOFs exhibit semiconducting behaviour that can activate H 2 O 2 or PS via capture of the photo-generated electrons in the conduction band under visible light irradiation [23, 24]. Though one function of MOFs is as good photocatalysts, another important function is that they can participate in AOPs through Fenton-like reaction pathways via CUS acting as alternative active sites [25].…”

Section: Introductionmentioning

confidence: 99%

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Wan

et al. 2017

Catal. Sci. Technol.

132

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In this work, a novel effective heterogeneous catalyst metal-organic framework MIL-53(Fe) has been synthesized for the purpose of activating persulfate (PS). Catalytic performance of MIL-53(Fe) activated under different vacuum conditions was investigated; stability and reusability of the catalyst were evaluated, and the activation mechanism was also investigated. The results indicated that vacuum activation could cause variation of the FeII/FeIII relative amount ratio of the catalyst, and thus would change the catalytic activities of MIL-53(Fe), because FeII or FeIII CUS (coordinative unsaturated metal site) are alternative active sites. It was found that MIL-53(Fe)-2 exhibits good performance for PS activation and could be used for multiple cycles. A removal rate of 98% for Orange G was obtained within 120min (95.7% mineralization efficiency), and 94.3% was attained in the fifth cycle. The mechanism of the activation of PS by MIL-53(Fe) was also suggested, which involves a predominant heterogeneous reaction and an auxiliary homogeneous reaction. The findings of this study provide new insight into the application of the reactive metal-organic frameworks in activating persulfate for the degradation of environmental contaminants.

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Section: Introductionmentioning

confidence: 99%

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Wan

et al. 2017

Catal. Sci. Technol.

132

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“…Additionally, the spectra displayed no extra peaks for copper or platinum species, most likely because of their low amount and/or high dispersion. [10] The anatase structure was further supported by Raman spectroscopy (Figure 1 b). The typical Raman peaks for anatase TiO 2 were clearly observed at 144 (E g ), 198 (E g ), 399 (B 1g ), 512 (A 1g ), and 639 cm À1 (E g ).…”

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confidence: 84%

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Xie

Rao

et al. 2020

Angewandte Chemie

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Oxidative coupling of methane (OCM) is considered one of the most promising catalytic technologies to upgrade methane. However, C 2 products (C 2 H 6 /C 2 H 4) from conventional methane conversion have not been produced commercially owing to competition from overoxidation and carbon accumulation at high temperatures. Herein, we report the codeposition of Pt nanoparticles and CuO x clusters on TiO 2 (PC-50) and use of the resulting photocatalyst for OCM in a flow reactor operated at room temperature under atmospheric pressure for the first time. The optimized Cu 0.1 Pt 0.5 /PC-50 sample showed a highest yield of C 2 product of 6.8 mmol h À1 at a space velocity of 2400 h À1 , more than twice the sum of the activity of Pt/PC-50 (1.07 mmol h À1) and Cu/PC-50 (1.9 mmol h À1), it might also be the highest among photocatalytic methane conversions reported so far under atmospheric pressure. A high C 2 selectivity of 60 % is also comparable to that attainable by conventional high-temperature (> 943 K) thermal catalysis. It is proposed that Pt functions as an electron acceptor to facilitate charge separation, while holes could transfer to CuO x to avoid deep dehydrogenation and the overoxidation of C 2 products.

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“…The standard redox potential for COH/H 2 Oi s2 .68 V( vs. NHE), [53,54] which is higher than the VB of ADA-Cd, indicating that the photogenerated holes on ADA-Cd could not directly oxidize water to COH. The redox potential for COH/OH À (1.99 V vs. NHE) [7] is lower than the VB of ADA-Cd, making it possible but not easy for the h + to oxidizeO H À to COH because of the minor potential difference.Additionally,the h + ,with strong oxidative capacity,w ould react with dyes directly.D riven by the difference betweent he CB potentials, [55,56] the excited elec- trons of ADA-Cd transferred to the CB (À0.4 Vv s. NHE) of TiO 2 , [30] which can effectively inhibit the recombination of the electron-hole pairs generated by ADA-Cd upon visible light irradiation.T he e À in the CB of TiO 2 reacted with O 2 (O 2 /CO 2 À , À0.046 Vv s. NHE) [57] from the air to form CO 2 À ,w hich wasc onfirmed by the inhibition method (N 2 flow) and direct method (O 2 flow and NBTm ethod). It is noteworthy that CO 2 À should be the main oxidative species in this system judged from the trappinge xperiments.…”

Section: Mechanistic Studymentioning

confidence: 99%

“…[21][22][23][24][25][26][27][28][29] Relying on crystal engineering, the absorbance and band gap values of MOFsc an be rationally tuned, makingt hem promising sensitizers forT iO 2 . [30][31][32][33][34] For most of the currently reportedm ethods, TiO 2 or TiÀOc lusters are chemically bondedt os pecific frameworkso rl inkers, which is too complicated and specific to be generalized, thus the development of af acile strategy to achieve high visible photocatalytic efficiency remainsac hallenge.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Framework Photosensitized TiO₂ Co‐catalyst: A Facile Strategy to Achieve a High Efficiency Photocatalytic System

Xie

Shao

et al. 2017

Chemistry A European J

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A 3D metal-organic framework (ADA-Cd=[Cd L (DMF) ]⋅3 H O where H L is (2E,2'E)-3,3'-(anthracene-9,10-diyl)diacrylic acid) constructed from diacrylate substituted anthracene, sharing structural characteristics with some frequently employed anthraquinone-type dye sensitizers, was introduced as an effective sensitizer for anatase TiO to achieve enhanced visible light photocatalytic performance. A facile mechanical mixing procedure was adopted to prepare the co-catalyst denoted as ADA-Cd/TiO , which showed enhanced photodegradation ability, as well as sustainability, towards several dyes under visible light irradiation. Mechanistic studies revealed that ADA-Cd acted as the antenna to harvest visible light energy, generating excited electrons, which were injected to the conduction band (CB) of TiO , facilitating the separation efficiency of charge carriers. As suggested by the results of control experiments, combined with the corresponding redox potential of possible oxidative species, O , generated from the oxygen of ambient air at the CB of TiO was believed to play a dominant role over OH and h . UV/Vis and photoluminescence technologies were adopted to monitor the generation of O and OH, respectively. This work presents a facile strategy to achieve a visible light photocatalyst with enhanced catalytic activity and sustainability; the simplicity, efficiency, and stability of this strategy may provide a promising way to achieve environmental remediation.

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TiO2 encapsulated in Salicylaldehyde-NH2-MIL-101(Cr) for enhanced visible light-driven photodegradation of MB

Cited by 184 publications

References 46 publications

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Metal–Organic Framework Photosensitized TiO₂ Co‐catalyst: A Facile Strategy to Achieve a High Efficiency Photocatalytic System

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TiO2 encapsulated in Salicylaldehyde-NH2-MIL-101(Cr) for enhanced visible light-driven photodegradation of MB

Cited by 184 publications

References 46 publications

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with FeII/FeIII mixed-valence coordinatively unsaturated iron center

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with FeII/FeIII mixed-valence coordinatively unsaturated iron center

Platinum‐ and CuOx‐Decorated TiO2 Photocatalyst for Oxidative Coupling of Methane to C2 Hydrocarbons in a Flow Reactor

Metal–Organic Framework Photosensitized TiO2 Co‐catalyst: A Facile Strategy to Achieve a High Efficiency Photocatalytic System

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Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Activation performance and mechanism of a novel heterogeneous persulfate catalyst: metal–organic framework MIL-53(Fe) with Fe^II/Fe^III mixed-valence coordinatively unsaturated iron center

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Metal–Organic Framework Photosensitized TiO₂ Co‐catalyst: A Facile Strategy to Achieve a High Efficiency Photocatalytic System