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

被引:304
作者
Crake, Angus [1 ]
Christoforidis, Konstantinos C. [1 ]
Kafizas, Andreas [2 ]
Zafeiratos, Spyridon [3 ]
Petit, Camille [1 ]
机构
[1] Imperial Coll London, Dept Chem Engn, Barrer Ctr, South Kensington Campus, London SW7 2AZ, England
[2] Imperial Coll London, Dept Chem, South Kensington Campus, London SW7 2AZ, England
[3] Univ Strasbourg, Inst Chim & Proc Energie Environm & Sante ICPEES, ECPM, 25 Rue Becquerel, Strasbourg 2, France
基金
英国工程与自然科学研究理事会;
关键词
Metal-organic frameworks; Titanium dioxide; Photocatalysis; Carbon dioxide; Reduction; METAL-ORGANIC FRAMEWORKS; TRANSIENT ABSORPTION-SPECTROSCOPY; CARBON-DIOXIDE; ANATASE TIO2; 001; FACETS; SEMICONDUCTOR; EFFICIENT; PHOTOREDUCTION; NANOPARTICLES; PHOTOANODES;
D O I
10.1016/j.apcatb.2017.03.039
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:131 / 140
页数:10
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