3 years ago

Understanding the Correlation of Crystal Atoms with Photochemistry Property: Zn5(OH)6(CO3)2 vs. ZnCO3

Zhe Liu, Fei Teng

Abstract

In this work, Zn5(OH)6(CO3)2 nanosheets are prepared by a simple hydrothermal method, and ZnCO3 are also prepared to compare. It is found that compared with ZnCO3, hydroxyl anion greatly changes energy band structure and oxidation potential of valence band, and improves charge separation efficiency and rates of Zn5(OH)6(CO3)2. The time‐resolved photoluminescence (PL) results show that the average lifetime (τ) of carriers is 1.485 ns for Zn5(OH)6(CO3)2, while 0.380 ns for ZnCO3, illustrating a greatly low carrier recombination rate of Zn5(OH)6(CO3)2; and Zn5(OH)6(CO3)2 has a 20 times photocurrent higher than ZnCO3. Besides, Zn5(OH)6(CO3)2 has a greatly higher oxidation potential (5.05 V) than ZnCO3 (3.17 V), suggesting a high oxidizing ability of Zn5(OH)6(CO3)2. Under ultraviolet light irradiation (λ≤400 nm), 92% of MB can be degraded by Zn5(OH)6(CO3)2 after 80 min, which is 2.31 times as high as that of ZnCO3, although Zn5(OH)6(CO3)2 has a lower BET area (5.8 m2g−1) than ZnCO3 (7.7 m2g−1). This work favors to insight into the correlation of crystal atoms with photochemistry property for a photocatalyst.

Publisher URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/slct.201801420

DOI: 10.1002/slct.201801420

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