Mechanistic Insight into Photocatalytic Pathways of MIL-100(Fe)/TiO2 Composites.
Reads0
Chats0
TLDR
A MIL-100(Fe)/TiO2 composite was synthesized as a prototypical photocatalyst and studied systematically to explore the interface structure and unravel the charge transfer pathways in MOF/semiconductor composite photocatalysts to advance the fundamental understanding of the interface structures.Abstract:
The integration of metal-organic frameworks (MOFs) with semiconductors has attracted mounting attention for photocatalytic applications. However, more efforts are needed to unravel the interface structure in MOF/semiconductor composites and its role in charge transfer. Herein, a MIL-100(Fe)/TiO2 composite was synthesized as a prototypical photocatalyst and studied systematically to explore the interface structure and unravel the charge transfer pathways during the photocatalytic processes. The composite was fabricated by growing MIL-100(Fe) crystals on TiO2 using surface-coated FeOOH as the precursor. The as-prepared MIL-100(Fe)/TiO2 exhibited significantly improved photocatalytic performance over pristine TiO2, which was mainly because of the enhanced charge separation as confirmed by transient absorption spectroscopy analysis. This enhancement partially arose from the special chemical structure at the interface, where the Fe-O-Ti bond was formed. As verified by the density functional theory calculation, this distinct structure would create defect energy levels adjacent to the valence band maximum of TiO2. During the photocatalytic processes, the defect energy levels serve as sinks to capture excited charge carriers and retard the recombination, which subsequently leads to the increased charge density and promoted photocatalytic efficiency. Meanwhile, the intimate interactions between MIL-100(Fe) and TiO2 would also help to improve the charge separation by transferring photo-induced holes through the ligands to Fe-O clusters. These findings would advance the fundamental understanding of the interface structure and the charge transfer pathways in MOF/semiconductor composite photocatalysts.read more
Citations
More filters
Journal ArticleDOI
Recent advances in MOF-based photocatalysis: environmental remediation under visible light
TL;DR: In this paper, a review of metal-organic frameworks (MOFs) for environmental remediation under visible light, including wastewater treatment, air purification and disinfection, is presented, where a series of strategies have been designed to modify and regulate pristine MOFs for enhanced photocatalytic performance, such as ligand functionalization, mixed-metal/linker strategy, metal ion/ligand immobilization, dye sensitization, carbon material decoration, semiconductor coupling, MOF/COF coupling, carrier loading and magnetic recycling.
Journal ArticleDOI
A Review of MOFs and Their Composites-Based Photocatalysts: Synthesis and Applications
Journal ArticleDOI
The synthesis strategies and photocatalytic performances of TiO2/MOFs composites: A state-of-the-art review
Chong-Chen Wang,Xun Wang,Wen Liu +2 more
TL;DR: In this paper, the outlooks and challenges of TiO2/MOF composites as photocatalysts for energy conversion and environment remediation are proposed, and the fabrication strategies, characterizations techniques, photocatalysis activities and the mechanisms of some selected selected composites were reviewed and highlighted.
Journal ArticleDOI
Photo-Fenton self-cleaning PVDF/NH2-MIL-88B(Fe) membranes towards highly-efficient oil/water emulsion separation
Atian Xie,Jiuyun Cui,Jin Yang,Yangyang Chen,Jihui Lang,Chunxiang Li,Yongsheng Yan,Jiangdong Dai +7 more
TL;DR: In this article, a simple non-solvent induced phase conversion method was used to obtain an antifouling membrane with high photo-Fenton activity of NM88B.
Journal ArticleDOI
Graphene oxide/Fe(III)-based metal-organic framework membrane for enhanced water purification based on synergistic separation and photo-Fenton processes
Atian Xie,Jiuyun Cui,Jin Yang,Yangyang Chen,Jihui Lang,Chunxiang Li,Yongsheng Yan,Jiangdong Dai +7 more
TL;DR: In this paper, a graphene oxide/MIL-88A(Fe) (GO/M88A) membrane was prepared for the first time by a facile vacuum filtration method.
References
More filters
Journal ArticleDOI
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set
Georg Kresse,Jürgen Furthmüller +1 more
TL;DR: A detailed description and comparison of algorithms for performing ab-initio quantum-mechanical calculations using pseudopotentials and a plane-wave basis set is presented in this article. But this is not a comparison of our algorithm with the one presented in this paper.
Journal ArticleDOI
Synthesis of metal-organic frameworks (MOFs): routes to various MOF topologies, morphologies, and composites.
Norbert Stock,Shyam Biswas +1 more
Journal ArticleDOI
Metal-organic frameworks
TL;DR: A range of novel structures has been prepared which feature amongst the largest pores known for crystalline compounds, very high sorption capacities and complex sorption behaviour not seen in aluminosilicate zeolites.
Journal ArticleDOI
Imparting functionality to a metal–organic framework material by controlled nanoparticle encapsulation
Guang Lu,Shaozhou Li,Zhen Guo,Omar K. Farha,Brad G. Hauser,Xiaoying Qi,Yi Wang,Xin Wang,Sanyang Han,Xiaogang Liu,Xiaogang Liu,Joseph S. DuChene,Hua Zhang,Qichun Zhang,Xiaodong Chen,Jan Ma,Say Chye Joachim Loo,Wei David Wei,Yanhui Yang,Joseph T. Hupp,Fengwei Huo +20 more
TL;DR: A controlled encapsulation strategy is reported that enables surfactant-capped nanostructured objects of various sizes, shapes and compositions to be enshrouded by a zeolitic imidazolate framework (ZIF-8).
Journal ArticleDOI
Synthesis and catalytic properties of MIL-100(Fe), an iron(III) carboxylate with large pores
Patricia Horcajada,Suzy Surblé,Christian Serre,Do-Young Hong,You-Kyong Seo,Jong-San Chang,Jean-Marc Greneche,Irene Margiolaki,Gérard Férey +8 more
TL;DR: The large-pore iron(III) carboxylate MIL-100(Fe) with a zeotype architecture has been isolated under hydrothermal conditions, its structure solved from synchrotron X-ray powder diffraction data, while Friedel-Crafts benzylation catalytic tests indicate a high activity and selectivity for MIL- 100(Fe).