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 - Funding Information:
The authors acknowledge financial supports from Japan Society for the Promotion of Science (JSPS) KAKENHI (A) (No. JP18F18387), Cooperative Research Programs at Hokkaido University Institute for Catalysis (Nos. 18A1001, 19B1002 and 20A1001) and Kyushu University (Progress 100) to KS and the National Science Foundation (NSF) under grant number DMREF-1729338 to ID. XPS measurements were carried out in Nanotech Center, Kyushu University and TEM-EDX images were observed in HVEM Center, Kyushu University. The computational work was performed using high-performance computing resources from the Penn State Institute of Cyberscience.
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.
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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 -