Mechanism and Reaction Kinetics of Formaldehyde Oxidation on TiO2: Amorphous Hydroxylated Outperforms Anatase

被引:0
|
作者
Sun, Zhiguang [1 ,2 ]
Zhu, Xiaobing [1 ]
Li, Xiao-Song [1 ]
Cai, Rui [2 ]
Zhu, Ai-Min [1 ]
机构
[1] Dalian Univ Technol, Ctr Hydrogen Energy & Environm Catalysis, Lab Plasma Phys Chem, Dalian 116024, Peoples R China
[2] Dalian Univ Technol, Instrumental Anal Ctr, Dalian 116024, Peoples R China
基金
中国国家自然科学基金;
关键词
PHOTOCATALYTIC OXIDATION; GASEOUS FORMALDEHYDE; AIR PURIFICATION; SURFACE; TITANIA; PHASE; PHOTODEGRADATION; SEMICONDUCTOR; DEGRADATION; ADSORPTION;
D O I
10.1021/acs.iecr.3c04334
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Addressing low-occurrence problems from low concentrations, we demonstrate amorphous TiO2-0.5x(OH)(x) nanofilms (amT) that feature abundant hydroxyl groups (of bulk and surface) for formaldehyde oxidation under UVC irradiation. Such hydroxyl groups can significantly enrich bound water (of adsorbed and produced) and formaldehyde at a hydration layer on the surface. With this structure, mechanistic insights and reaction kinetics are correlated. Compared to the anatase one (anT), our amT exhibits a remarkable decrease in the recombination of charge carriers, complete formaldehyde oxidation even at dry conditions, a nearly zero-order reaction that elucidates the approximately independent kinetics, and an unprecedentedly 10(4)-fold increase in the reaction rate. Based on photoluminescence and Fourier transform infrared spectroscopy, light indispensability and moisture enhancement to formaldehyde oxidation are corroborated. Consequently, due to abundant hydroxyl groups, the mass transfer (of formaldehyde and water) at its hydration layer is strengthened, as evidenced by the mechanistic insights; hence, fascinating kinetics is achieved for environmental applications in practice.
引用
收藏
页码:4353 / 4361
页数:9
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