Improvement of photocatalytic activity under visible-light irradiation by heterojunction of Cu ion loaded WO3 and Cu ion loaded N-TiO2

被引：28

作者：

Iihoshi, Tomoya ^{[1
]}

Ohwaki, Takeshi ^{[1
]}

Vequizo, Junie Jhon M. ^{[2
]}

Yamakata, Akira ^{[2
]}

机构：

[1] Meijo Univ, Grad Sch Sci & Technol, Tempaku Ku, 1-501 Shiogamaguchi, Nagoya, Aichi 4688502, Japan

[2] Toyota Technol Inst, Guraduate Sch Engn, Tempaku Ku, 2-12-1 Hisalcata, Nagoya, Aichi 4688511, Japan

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2019年 / 248卷

关键词：

Photocatalyst; Heterojunction; Charge transfer; Composites; PHOTOGENERATED CHARGE-CARRIERS; TIME-RESOLVED ABSORPTION; TITANIUM-DIOXIDE; TIO2; POWDERS; DECOMPOSITION; MECHANISM; BEHAVIOR; ANATASE; PHOTODEGRADATION; SPECTROSCOPY;

D O I：

10.1016/j.apcatb.2019.01.046

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Visible-light-sensitive photocatalysts have frequently been used for indoor environmental purification. In order to further expand the applications, improvements in photocatalytic performance are desired. In this study, we have prepared new composite photocatalysts with copper ion loaded tungsten trioxide (Cu/WO3) and copper ion loaded nitrogen-doped titanium dioxide (Cu/N-TiO2) as a function of the composition ratio. Acetaldehyde decomposition activities under visible-light irradiation have been significantly enhanced by the heterojunction photocatalysts at a composition ratio of 1:9 against Cu/WO3 and Cu/N-TiO2. We have also investigated the enhanced mechanisms of the photocatalytic activity using time-resolved visible to mid-infrared (mid-IR) absorption spectroscopy. It has been revealed that there are longer hole lifetimes via electron transfer from the conduction bands of N-TiO(2 )and WO3 to Cu ions, and hole transfer from the valence band of WO3 to that of N-TiO2.

引用

页码：249 / 254

页数：6

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