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Open AccessArticle

Step-by-Step Growth of HKUST-1 on Functionalized TiO2 Surface: An Efficient Material for CO2 Capture and Solar Photoreduction

1
Department of Materials Science, INSTM, University of Milano-Bicocca, Via R. Cozzi, 55, 20125 Milano, Italy
2
Dipartimento di Energia, Ingegneria dell’Informazione e Modelli Matematici DEIM—Università degli Studi di Palermo, Viale delle Scienze (Ed. 6), 90128 Palermo, Italy
3
Istituto di Chimica dei Composti Organometallici ICCOM-CNR, Via Madonna del Piano, 10, 50019 Sesto Fiorentino (Firenze), Italy
4
Istituto Officina dei Materiali IOM-CNR, Laboratorio TASC, Area Science Park-Basovizza, Edificio MM, Strada Statale 14, km 163,5, I-34149 Trieste, Italy
5
Istituto di Scienze e Tecnologie Molecolari ISTM-CNR, via G. Fantoli, 16-15, 20138 Milano, Italy
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(9), 353; https://doi.org/10.3390/catal8090353
Received: 13 July 2018 / Revised: 19 August 2018 / Accepted: 22 August 2018 / Published: 27 August 2018
(This article belongs to the Special Issue Hybrid Catalysis)
The present study reports on a simple preparation strategy of a hybrid catalyst, TiO2/HKUST-1, containing TiO2 anatase nanoparticles (NPs) with tailored morphology and photocatalytic activity coupled with a porous metal-organic framework (MOF), namely HKUST-1, as an advanced material for the CO2 photocatalytic reduction. In detail, TiO2/HKUST-1 catalyst was prepared via an easy slow-diffusion method combined with a step-by-step self-assembly at room temperature. The growth of crystalline HKUST-1 onto titania surface was achieved by functionalizing TiO2 nanocrystals, with phosphoesanoic acid (PHA), namely TiO2-PHA, which provides an intimate contact between MOF and TiO2. The presence of a crystalline and porous shell of HKUST-1 on the TiO2 surfaces was assessed by a combination of analytical and spectroscopic techniques. TiO2/HKUST-1 nanocomposite showed a significant efficiency in reducing CO2 to CH4 under solar light irradiation, much higher than those of the single components. The role of MOF to improve the photoreduction process under visible light was evidenced and attributed either to the relevant amount of CO2 captured into the HKUST-1 porous architecture or to the hybrid structure of the material, which affords enhanced visible light absorption and allows an effective electron injection from TiO2-PHA to HKUST-1, responsible for the photochemical reduction of CO2. View Full-Text
Keywords: CO2 photoreduction; metal-organic frameworks; HKUST-1; titanium dioxide; hybrid nanocomposite CO2 photoreduction; metal-organic frameworks; HKUST-1; titanium dioxide; hybrid nanocomposite
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MDPI and ACS Style

Di Credico, B.; Redaelli, M.; Bellardita, M.; Calamante, M.; Cepek, C.; Cobani, E.; D’Arienzo, M.; Evangelisti, C.; Marelli, M.; Moret, M.; Palmisano, L.; Scotti, R. Step-by-Step Growth of HKUST-1 on Functionalized TiO2 Surface: An Efficient Material for CO2 Capture and Solar Photoreduction. Catalysts 2018, 8, 353.

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