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CO2 capture and photocatalytic reduction using bifunctional TiO2/MOF nanocomposites under UV-vis irradiation

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Title: CO2 capture and photocatalytic reduction using bifunctional TiO2/MOF nanocomposites under UV-vis irradiation
Authors: Crake, A
Christoforidis, KC
Kafizas, A
Zafeiratos, S
Petit, C
Item Type: Journal Article
Abstract: TiO2 nanosheets and metal-organic framework (NH2-UiO-66) were effectively coupled via an in‐situ growth strategy to form bifunctional materials for the combined capture and photocatalytic reduction of CO2 under UV–vis light irradiation. This was done to take advantage of the high CO2 adsorption capacity of the MOF and the photocatalytic properties of pre-formed TiO2 nanosheets in a single material. The prepared materials were thoroughly characterized using a variety of techniques. They were subsequently tested for CO2 adsorption and CO2 photocatalytic reduction using a heterogeneous gas/solid set-up to imitate both CO2 capture and fixation in a single process. The adopted synthesis process allowed the development of a tight interaction between TiO2 and NH2-UiO-66 forming a heterojunction, while maintaining both the high CO2 uptake and porosity of NH2-UiO-66. The nanocomposites were proven durable and significantly more efficient in reducing CO2 to CO than their single components. Photocatalytic activity was greatly affected by the nanocomposites composition with the optimum TiO2 content doubling the CO evolution rate compared with the pure TiO2. The improved photoactivity was assigned to the enhanced abundance of long lived charge carriers, as revealed by transient absorption spectroscopy (TAS). This most likely occurred due to the effective charge transfer via interface. A possible mechanism is discussed on the basis of the combined catalytic, spectroscopic and CO2 adsorption results.
Issue Date: 5-Aug-2017
Date of Acceptance: 15-Mar-2017
URI: http://hdl.handle.net/10044/1/64140
DOI: https://dx.doi.org/10.1016/j.apcatb.2017.03.039
ISSN: 0926-3373
Publisher: Elsevier
Start Page: 131
End Page: 140
Journal / Book Title: Applied Catalysis B: Environmental
Volume: 210
Copyright Statement: © 2017 Elsevier B.V. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering and Physical Sciences Research Council
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/N024206/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Engineering, Environmental
Engineering, Chemical
Chemistry
Engineering
Metal-organic frameworks
Titanium dioxide
Photocatalysis
Carbon dioxide
Reduction
METAL-ORGANIC FRAMEWORKS
TRANSIENT ABSORPTION-SPECTROSCOPY
CARBON-DIOXIDE
ANATASE TIO2
WATER OXIDATION
001 FACETS
BAND-GAP
SEMICONDUCTOR
EFFICIENT
PHOTOOXIDATION
0306 Physical Chemistry (Incl. Structural)
0904 Chemical Engineering
0907 Environmental Engineering
Physical Chemistry
Publication Status: Published
Online Publication Date: 2017-03-16
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences



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