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- W4385755614 abstract "Photocatalytic CO2 reduction to CO with water can be promoted over potassium hexatitanate (K2Ti6O13, KTO) photocatalyst decorated with Ag cocatalyst. In the present study, a sol-gel method was employed to know the effect of the calcination temperature for preparation of KTO samples. The KTO samples calcined at temperatures above 773 K show X-ray diffraction pattern assignable to K2Ti6O13 crystal phase while the crystallite size increases with increasing the calcination temperature. After photodeposition (PD) of Ag cocatalyst on these KTO samples, their photocatalytic performance for CO2 reduction was evaluated. The photocatalytic activity of the Ag/KTO photocatalysts increases with the calcination temperature and a clear positive relationship is found between the KTO crystallite size and the photocatalytic activity. Some spectroscopic investigations reveal that the state of the Ag cocatalyst is also influenced by the calcination temperature of the KTO samples, i.e., the KTO sample calcined at low temperature provides oxidized Ag species by the PD method while the ones calcined at high temperature gives the metallic Ag nanoparticles, meaning that the KTO photocatalytic property varied with the calcination temperature controls the oxidation state of the photodeposited Ag species. It is demonstrated that the property of the resulting Ag cocatalyst is another contributing factor for the photocatalytic activity of the Ag/KTO photocatalysts. Thus, it is concluded that the photocatalytic activity is determined by both the KTO properties and the property of the photodeposited Ag cocatalyst depending on the KTO photocatalytic activity, where both originally come from the calcination temperature of the KTO sample." @default.
- W4385755614 created "2023-08-12" @default.
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- W4385755614 date "2024-01-01" @default.
- W4385755614 modified "2023-09-27" @default.
- W4385755614 title "Variously calcined potassium hexatitanate photocatalysts with silver cocatalyst for photocatalytic CO2 reduction with water" @default.
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- W4385755614 doi "https://doi.org/10.1016/j.cattod.2023.114343" @default.
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