TY - JOUR
T1 - Improvement of photocatalytic activity under visible-light irradiation by heterojunction of Cu ion loaded WO3 and Cu ion loaded N-TiO2
AU - Iihoshi, Tomoya
AU - Ohwaki, Takeshi
AU - Vequizo, Junie Jhon M.
AU - Yamakata, Akira
N1 - Funding Information:
This work was partially supported by JSPS KAKENHI Grant Number 15K05601 . We thank to TOYOTA Tsusho Corporation and TOYOTSU Vehitecs Co., Ltd., who provided a part of the samples.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/7/5
Y1 - 2019/7/5
N2 - 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-TiO2 and WO3 to Cu ions, and hole transfer from the valence band of WO3 to that of N-TiO2.
AB - 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-TiO2 and WO3 to Cu ions, and hole transfer from the valence band of WO3 to that of N-TiO2.
KW - Charge transfer
KW - Composites
KW - Heterojunction
KW - Photocatalyst
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U2 - 10.1016/j.apcatb.2019.01.046
DO - 10.1016/j.apcatb.2019.01.046
M3 - Article
AN - SCOPUS:85061737804
SN - 0926-3373
VL - 248
SP - 249
EP - 254
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -