TY - JOUR
T1 - A promising Zn-Ti layered double hydroxide/Fe-bearing montmorillonite composite as an efficient photocatalyst for Cr(VI) reduction
T2 - Insight into the role of Fe impurity in montmorillonite
AU - Chuaicham, Chitiphon
AU - Xiong, Yihuang
AU - Sekar, Karthikeyan
AU - Chen, Weinan
AU - Zhang, Li
AU - Ohtani, Bunsho
AU - Dabo, Ismaila
AU - Sasaki, Keiko
N1 - Publisher Copyright:
© 2020
PY - 2021/4/30
Y1 - 2021/4/30
N2 - Zn-Ti layered double hydroxide/montmorillonite (ZTL/MT) and Fe-doped ZTL/MT (ZTL/Fe@MT20%) were prepared as photocatalyst for Cr(VI) reduction. The ZTL/Fe@MT20% exhibited the highest photocatalytic activity, suggesting that a combination of ZTL and Fe-bearing MT could enhance photocatalytic activity by suppressing the recombination of photogenerated electron-hole pairs. On the basis of electronic-structure calculations, a photocatalytic mechanism for Cr(VI) reduction and the effect of Fe3+ on the structure of MT in ZTL/MT composites is proposed by density functional theory approach, whereby Fe impurities in MT generate a new mid-gap state that induce a Z-scheme heterojunction with ZTL, leading to reduced recombination of the photogenerated charge carriers in ZTL. These results establish that MT can not only act as a support material but also play an important role for photocatalytic reaction when Fe impurities are present in its structure.
AB - Zn-Ti layered double hydroxide/montmorillonite (ZTL/MT) and Fe-doped ZTL/MT (ZTL/Fe@MT20%) were prepared as photocatalyst for Cr(VI) reduction. The ZTL/Fe@MT20% exhibited the highest photocatalytic activity, suggesting that a combination of ZTL and Fe-bearing MT could enhance photocatalytic activity by suppressing the recombination of photogenerated electron-hole pairs. On the basis of electronic-structure calculations, a photocatalytic mechanism for Cr(VI) reduction and the effect of Fe3+ on the structure of MT in ZTL/MT composites is proposed by density functional theory approach, whereby Fe impurities in MT generate a new mid-gap state that induce a Z-scheme heterojunction with ZTL, leading to reduced recombination of the photogenerated charge carriers in ZTL. These results establish that MT can not only act as a support material but also play an important role for photocatalytic reaction when Fe impurities are present in its structure.
UR - https://www.scopus.com/pages/publications/85100102817
UR - https://www.scopus.com/pages/publications/85100102817#tab=citedBy
U2 - 10.1016/j.apsusc.2020.148835
DO - 10.1016/j.apsusc.2020.148835
M3 - Article
AN - SCOPUS:85100102817
SN - 0169-4332
VL - 546
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 148835
ER -