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

作者：Liu, Zhe; Teng, Fei^*

来源：ChemistrySelect, 2018, 3(31): 8886-8894.

DOI：10.1002/slct.201801420

• charge separation and transfer
• energy band
• hydroxyl anion
• Zn-5(OH)(6)(CO3)(2)

In this work, Zn-5(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 Zn-5(OH)(6)(CO3)(2). The time-resolved photoluminescence (PL) results show that the average lifetime (T) of carriers is 1.485 ns for Zn-5(OH)(6)(CO3)(2), while 0.380 ns for ZnCO3, illustrating a greatly low carrier recombination rate of Zn-5(OH)(6)(CO3)(2); and Zn-5(OH)(6)(CO3)(2) has a 20 times photocurrent higher than ZnCO3. Besides, Zn-5(OH)(6)(CO3)(2) has a greatly higher oxidation potential (5.05 V) than ZnCO3 (3.17 V), suggesting a high oxidizing ability of Zn-5(OH)(6)(CO3)(2). Under ultraviolet light irradiation (lambda <= 400 nm), 92% of MB can be degraded by Zn-5(OH)(6)(CO3)(2)after 80 min, which is 2.31 times as high as that of ZnCO3, although Zn-5(OH)(6)(CO3)(2) has a lower BET area (5.8 m(2) g(-1)) than ZnCO3 (7.7 m(2) g(-1)). This work favors to insight into the correlation of crystal atoms with photochemistry property for a photocatalyst.

• 出版日期2018-8-23
• 单位南京信息工程大学