Enhancing TiO2 activity for CO2 photoreduction through MgO decoration. Issue 35 (January 2020)

• Record Type: Journal Article
• Authors: Torres, Juliana A.; Nogueira, André E.; da Silva, Gelson T.S.T.; Lopes, Osmando F.; Wang, Yanjie; He, Tao; Ribeiro, Caue
• Is Part Of: Journal of CO₂ utilization. Issue 35(2020)
• Page Start: 106
• Page End: 114
• Publication Date: 2020-01
• Subjects: CO2 photoreduction -- Artificial photosynthesis -- Basic metal oxides -- TiO2/MgO; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2019.09.008
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: Influence of the MgO basic character in CO2 photoreduction of MgO:TiO2 nanocomposites. Photocatalytic activity of decorated TiO2 with selectivity for CO, CH4 in gas phase. Physical mixing of pre-synthesized oxides followed by calcination. Selectivity to HCOOH and CH3 COOH production in a liquid medium. Abstract: Herein we report on the influence of MgO's basic character in the photoactivity of MgO:TiO2 nanocomposites for the CO2 reduction reaction. TiO2 nanoparticles, decorated with MgO in different mass proportions, were synthesized by the physical mixing of pre-synthesized oxides followed by calcination. The decorated samples presented enhanced photocatalytic activity with higher selectivity for CO, while CH4 was also produced, as well as HCOOH and CH3 COOH in a liquid medium in lower proportions. The results indicate that the beneficial MgO influence is only effective at low amounts, whilst a high MgO amount favors an insulating behavior instead of semiconducting, reducing the nanocomposite performance for CO2 photoreduction.