Effect of ionic liquid in a pressurized reactor to enhance CO2 photocatalytic reduction at TiO2 modified by gold nanoparticles

Author(s)

Perini, Joao Angelo Lima ; Irikura, Kallyni ; Torquato, Lilian D. Moura ; Flor, Jader Barbosa da S. ; Zanoni, Maria V. Boldrin

• Document type: Journal article
• Source: JOURNAL OF CATALYSIS; v. 405, p. 13-pg., 2022-01-01.

Abstract

This work describes the synergic effect of gold nanoparticles as co-catalyst on TiO2 nanotubes (TNT/AuNP) in aqueous medium containing the ionic liquid (IL) 1-Butyl-3-methylimidazolium tetrafluorobo-rate, in a pressurized photocatalytic reactor, as a good strategy to enhance CO2 conversion into value-added products. The surface plasmon resonance of the gold NPs improve the photoexcitation under vis-ible light and slightly change the TNT band gap from 3.2 to 2.9 eV. Methanol production using TNT/AuNP in aqueous medium containing 2% (v/v) BMIM-BF4, 1 g L-1 Na2SO3 as a hole scavenger, under 5 atm pressure and solar irradiation, produce up to 279.6 mM (mmol L-1) of methanol and 98.8 mM of methane, with the quantum yield of 1.12% at 440 nm. Isotope-labeled studies by GC/MS proved that (CO2)-C-13 is the source for photoproduction of (CH3OH)-C-13. The results indicate that the combination of the Au co-catalyst size, high pressure, and IL can provide efficient modulation of CO2 conversion. (C) 2021 Elsevier Inc. All rights reserved. (AU)

• FAPESP's process: 17/12790-7 - Preparation and characterization of TiO2 nanostructured electrodes modified with metal organic frameworks (MOFs) for application in the preconcentration and reduction of CO2
• Grantee: Kallyni Irikura
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 16/18057-7 - CO2 reduction aiming to generate value-added compounds by photocatalysis/photoelectrocatalysis using ionic liquid in a pressurized reactor
• Grantee: João Angelo de Lima Perini
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/00463-7 - Integrated and solar-driven bioelectrochemical systems for electricity and H2 production from co-digestion of crude glycerol and wastewater from citrus processing industry
• Grantee: Lilian Danielle de Moura Torquato
• Support Opportunities: Scholarships in Brazil - Post-Doctoral