Synthesis of novel MgAl layered double oxide grafted TiO2 cuboids and their photocatalytic activity on CO2 reduction with water vapor

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Abstract

A series of magnesium/aluminum (MgAl) layered double oxide (LDO) grafted TiO2 cuboids (MgAl-LDO/TiO2) with various molar ratios of (Mg + Al) to Ti were synthesized by a combination of hydrothermal and coprecipitation methods, in which the growth of MgAl-LDO platelets was controlled. The MgAl-LDO/TiO2 composite materials were used for photocatalytic CO2 reduction with water vapor under UV light irradiation in a continuous-flow reactor. CO was found to be the main product from CO2. At near room temperature (e.g., 50 °C), MgAl-LDO/TiO2 did not significantly enhance CO2 reduction compared with pure TiO2 cuboids. At a moderately elevated reaction temperature (e.g., 150°C), the MgAl-LDO/TiO2 sample with an optimum 10 wt.% MgAl-LDO loading demonstrated CO2 reduction activity five times higher than that of bare TiO2 cuboids. The photo-induced electrons on TiO2 may migrate to the MgAl-LDO/TiO2 interfacial sites to promote CO2 reduction. Findings in this work may lead to a new area of hybrid adsorbent/photocatalyst materials that are capable of sequential CO2 capture and photocatalytic conversion.

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Zhao, C., Liu, L., Rao, G., Zhao, H., Wang, L., Xu, J., & Li, Y. (2015). Synthesis of novel MgAl layered double oxide grafted TiO2 cuboids and their photocatalytic activity on CO2 reduction with water vapor. Catalysis Science and Technology, 5(6), 3288–3295. https://doi.org/10.1039/c5cy00216h

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