Systematic study of TiO2/ZnO mixed metal oxides for CO2 photoreduction

Warren A. Thompson; Alberto Olivo; Danny Zanardo; Giuseppe Cruciani; Federica Menegazzo; Michela Signoretto; M. Mercedes Maroto-Valer

doi:10.1039/c9ra03435h

Systematic study of TiO₂/ZnO mixed metal oxides for CO₂ photoreduction

Warren A. Thompson^*, Alberto Olivo, Danny Zanardo, Giuseppe Cruciani, Federica Menegazzo, Michela Signoretto, M. Mercedes Maroto-Valer

^*Corresponding author for this work

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Abstract

A two component three degree simplex lattice experimental design was employed to evaluate the impact of different mixing fractions of TiO₂ and ZnO on an ordered mesoporous SBA-15 support for CO₂ photoreduction. It was anticipated that the combined advantages of TiO₂ and ZnO: low cost, non-toxicity and combined electronic properties would facilitate CO₂ photoreduction. The fraction of ZnO had a statistically dominant impact on maximum CO₂ adsorption (β₂ = 22.65, p-value = 1.39 × 10^-4). The fraction of TiO₂ used had a statistically significant positive impact on CO (β₁ = 9.71, p-value = 2.93 × 10^-4) and CH₄ (β₁ = 1.43, p-value = 1.35 × 10^-3) cumulative production. A negative impact, from the interaction term between the fractions of TiO₂ and ZnO, was found for CH₄ cumulative production (β₃ = -2.64, p-value = 2.30 × 10^-2). The systematic study provided evidence for the possible loss in CO₂ photoreduction activity from sulphate groups introduced during the synthesis of ZnO. The decrease in activity is attributed to the presence of sulphate species in the ZnO prepared, which may possibly act as charge carrier and/or radical intermediate scavengers.

Original language	English
Pages (from-to)	21660-21666
Number of pages	7
Journal	RSC Advances
Volume	9
Issue number	38
Early online date	12 Jul 2019
DOIs	https://doi.org/10.1039/c9ra03435h
Publication status	Published - 16 Jul 2019

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering

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title = "Systematic study of TiO2/ZnO mixed metal oxides for CO2 photoreduction",

abstract = "A two component three degree simplex lattice experimental design was employed to evaluate the impact of different mixing fractions of TiO2 and ZnO on an ordered mesoporous SBA-15 support for CO2 photoreduction. It was anticipated that the combined advantages of TiO2 and ZnO: low cost, non-toxicity and combined electronic properties would facilitate CO2 photoreduction. The fraction of ZnO had a statistically dominant impact on maximum CO2 adsorption (β2 = 22.65, p-value = 1.39 × 10-4). The fraction of TiO2 used had a statistically significant positive impact on CO (β1 = 9.71, p-value = 2.93 × 10-4) and CH4 (β1 = 1.43, p-value = 1.35 × 10-3) cumulative production. A negative impact, from the interaction term between the fractions of TiO2 and ZnO, was found for CH4 cumulative production (β3 = -2.64, p-value = 2.30 × 10-2). The systematic study provided evidence for the possible loss in CO2 photoreduction activity from sulphate groups introduced during the synthesis of ZnO. The decrease in activity is attributed to the presence of sulphate species in the ZnO prepared, which may possibly act as charge carrier and/or radical intermediate scavengers.",

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Systematic study of TiO₂/ZnO mixed metal oxides for CO₂ photoreduction

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