MOFs based on ZIF-8 deposited on TiO2 nanotubes increase the surface adsorption of CO2 and its photoelectrocatalytic reduction to alcohols in aqueous media

Cardoso, J.; Stülp, Simone; Brito, Juliana Ferreira de; Flor, Jader Barbosa Silva; Frem, Regina Célia Galvão; Zanoni, María Valnice Boldrin

doi:10.1016/j.apcatb.2017.12.013

Cited by 180 publications

(74 citation statements)

References 63 publications

(97 reference statements)

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“…It is also possible that the electrons from RhB* can get directly injected into Pt and produce H 2 , as shown in Figure 17b [219]. Similarly, there have been other TiO 2 /MOFs-based photocatalytic systems reported [220][221][222][223][224][225]. The first black-TiO2 was produced by Chen et al with band gap energy of around 1.0 eV via high-pressure hydrogenation process in the crystalline TiO2 [235].…”

Section: Metal-organic Framework-tio 2 Compositesmentioning

confidence: 92%

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

2019

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Photocatalysis is a multifunctional phenomenon that can be employed for energy applications such as H2 production, CO2 reduction into fuels, and environmental applications such as pollutant degradations, antibacterial disinfection, etc. In this direction, it is not an exaggerated fact that TiO2 is blooming in the field of photocatalysis, which is largely explored for various photocatalytic applications. The deeper understanding of TiO2 photocatalysis has led to the design of new photocatalytic materials with multiple functionalities. Accordingly, this paper exclusively reviews the recent developments in the modification of TiO2 photocatalyst towards the understanding of its photocatalytic mechanisms. These modifications generally involve the physical and chemical changes in TiO2 such as anisotropic structuring and integration with other metal oxides, plasmonic materials, carbon-based materials, etc. Such modifications essentially lead to the changes in the energy structure of TiO2 that largely boosts up the photocatalytic process via enhancing the band structure alignments, visible light absorption, carrier separation, and transportation in the system. For instance, the ability to align the band structure in TiO2 makes it suitable for multiple photocatalytic processes such as degradation of various pollutants, H2 production, CO2 conversion, etc. For these reasons, TiO2 can be realized as a prototypical photocatalyst, which paves ways to develop new photocatalytic materials in the field. In this context, this review paper sheds light into the emerging trends in TiO2 in terms of its modifications towards multifunctional photocatalytic applications.

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Section: Metal-organic Framework-tio 2 Compositesmentioning

confidence: 92%

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

2019

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“…Voltammetric analysis shows an increased current response of the TiO2 nanotube discs when the photoanode is irradiated (Figure 3), which is associated with photogeneration of charge carriers [35][36][37]. Photons delivered from the UV light source to the TiO2 photoanode surface provide the energy required to overcome the band gap (Eg = 3.2 eV) [38,39]. The small overpotential of oxygen evolution with an onset potential of 1.65 V vs Ag/AgCl suggests a low capability for  OH electrogeneration from water oxidation (Equation (5)).…”

Section: Tio 2 Nanotube Photoelectrode Discs' Characterizationmentioning

confidence: 99%

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Montenegro-Ayo

Morales-Gomero

Alarcón

et al. 2019

Water

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Multiple discs coated with hierarchically-organized TiO2 anatase nanotubes served as photoelectrodes in a novel annular photoelectrocatalytic reactor. Electrochemical characterization showed light irradiation enhanced the current response due to photogeneration of charge carriers. The pharmaceutical acetaminophen was used as a representative water micropollutant. The photoelectrocatalysis pseudo-first-order rate constant for acetaminophen was seven orders of magnitude greater than electrocatalytic treatment. Compared against photocatalysis alone, our photoelectrocatalytic reactor at <8 V reduced by two fold, the electric energy per order (EEO; kWh m−3 order−1 for 90% pollutant degradation). Applying a cell potential higher than 8 V detrimentally increased EEO. Acetaminophen was degraded across a range of initial concentrations, but absorbance at higher concentration diminished photon transport, resulting in higher EEO. Extended photoelectrocatalytic reactor operation degraded acetaminophen, which was accompanied by 53% mineralization based upon total organic carbon measurements. This proof of concept for our photoelectrocatalytic reactor demonstrated a strategy to increase photo-active surface area in annular reactors.

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“…It has been suggested that furnishing and doping MOF templates with this titanium material would result in a great outcome due to morphological rapport [236,237]. Cardoso et al reported Ti/TiO 2 -based composite MOF for photocatalytic reduction of CO 2 [238], and remarkable thermal and chemical resilience zeolitic imidazolate frameworks (ZIFs) are still important aspects of MOFs [239]. Porous ZIFs are composed of coordinated tetrahedral divalent cations (Zn 2+ , Co 2+ , and Cd 2+ ) with a zeolite-like framework consisting of imidazole spacer ligands [240].…”

Section: Ti/tio 2 Compositementioning

confidence: 99%

Recent Innovation of Metal-Organic Frameworks for Carbon Dioxide Photocatalytic Reduction

2019

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The accumulation of carbon dioxide (CO2) pollutants in the atmosphere begets global warming, forcing us to face tangible catastrophes worldwide. Environmental affability, affordability, and efficient CO2 metamorphotic capacity are critical factors for photocatalysts; metal-organic frameworks (MOFs) are one of the best candidates. MOFs, as hybrid organic ligand and inorganic nodal metal with tailorable morphological texture and adaptable electronic structure, are contemporary artificial photocatalysts. The semiconducting nature and porous topology of MOFs, respectively, assists with photogenerated multi-exciton injection and adsorption of substrate proximate to void cavities, thereby converting CO2. The vitality of the employment of MOFs in CO2 photolytic reaction has emerged from the fact that they are not only an inherently eco-friendly weapon for pollutant extermination, but also a potential tool for alleviating foreseeable fuel crises. The excellent synergistic interaction between the central metal and organic linker allows decisive implementation for the design, integration, and application of the catalytic bundle. In this review, we presented recent MOF headway focusing on reports of the last three years, exhaustively categorized based on central metal-type, and novel discussion, from material preparation to photocatalytic, simulated performance recordings of respective as-synthesized materials. The selective CO2 reduction capacities into syngas or formate of standalone or composite MOFs with definite photocatalytic reaction conditions was considered and compared.

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MOFs based on ZIF-8 deposited on TiO2 nanotubes increase the surface adsorption of CO2 and its photoelectrocatalytic reduction to alcohols in aqueous media

Cited by 180 publications

References 63 publications

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Insights into the TiO2-Based Photocatalytic Systems and Their Mechanisms

Scaling up Photoelectrocatalytic Reactors: A TiO2 Nanotube-Coated Disc Compound Reactor Effectively Degrades Acetaminophen

Recent Innovation of Metal-Organic Frameworks for Carbon Dioxide Photocatalytic Reduction

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