Enhancement of photocatalytic decarboxylation on TiO2 by water-induced change in adsorption-mode

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	Enhancement of photocatalytic decarboxylation on TiO2 by water-induced change in adsorption-mode
	Zhang, Hongna; Zhou, Peng; Ji, Hongwei; Ma, Wanhong; Chen, Chuncheng; Zhao, Jincai
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2018-05-01
卷号	224 页码:376-382
英文摘要	Decarboxylation is an important process in the photocatalytic degradation of organic pollutants. In this study, the adsorption and photocatalytic decarboxylation of acetic acid and trichloroacetic acid were investigated by in-situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), which can distinguish carboxylate groups with different adsorption modes. We found that water molecules promote photocatalytic decarboxylation reaction and the promotional effect of water is attributed to the changed adsorption mode of the carboxylate group by the co-adsorbed water molecules. The IR study shows that degradation of the monodentate-coordinated acetic acids is much faster than that of the bidentate-coordinated one. The kinetic isotope effect studies and analysis of the intermediate products indicates that the degradation of acetic acids originates from the direct oxidation by holes even in the presence of water, rather than from the reaction of OH radicals as generally believed. DFT-based molecular dynamics calculations revealed that the formation of the monodentate-coordinated carboxylate group in the presence of water is attributed to competition between the O atom of the carboxylate group and water for the surface Ti sites. Because of its higher electron density, the monodentate carboxylate group is easier to be directly oxidized by holes than the bidentate group.
WOS记录号	WOS:000424960700040
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38688]
专题	化学研究所_其它
推荐引用方式 GB/T 7714	Zhang, Hongna,Zhou, Peng,Ji, Hongwei,et al. Enhancement of photocatalytic decarboxylation on TiO2 by water-induced change in adsorption-mode[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2018,224:376-382.
APA	Zhang, Hongna,Zhou, Peng,Ji, Hongwei,Ma, Wanhong,Chen, Chuncheng,&Zhao, Jincai.(2018).Enhancement of photocatalytic decarboxylation on TiO2 by water-induced change in adsorption-mode.APPLIED CATALYSIS B-ENVIRONMENTAL,224,376-382.
MLA	Zhang, Hongna,et al."Enhancement of photocatalytic decarboxylation on TiO2 by water-induced change in adsorption-mode".APPLIED CATALYSIS B-ENVIRONMENTAL 224(2018):376-382.