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Understanding the Correlation of Crystal Atoms with Photochemistry Property: Zn 5 (OH) 6 (CO 3 ) 2 vs . ZnCO 3
Author(s) -
Liu Zhe,
Teng Fei
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201801420
Subject(s) - photocurrent , oxidizing agent , photoluminescence , hydrothermal circulation , ultraviolet , valence (chemistry) , irradiation , materials science , valence band , photocatalysis , band gap , chemistry , analytical chemistry (journal) , catalysis , chemical engineering , physics , optoelectronics , organic chemistry , chromatography , nuclear physics , engineering , biochemistry
Abstract In this work, Zn 5 (OH) 6 (CO 3 ) 2 nanosheets are prepared by a simple hydrothermal method, and ZnCO 3 are also prepared to compare. It is found that compared with ZnCO 3 , 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 (CO 3 ) 2 . The time‐resolved photoluminescence (PL) results show that the average lifetime (τ) of carriers is 1.485 ns for Zn 5 (OH) 6 (CO 3 ) 2 , while 0.380 ns for ZnCO 3 , illustrating a greatly low carrier recombination rate of Zn 5 (OH) 6 (CO 3 ) 2 ; and Zn 5 (OH) 6 (CO 3 ) 2 has a 20 times photocurrent higher than ZnCO 3 . Besides, Zn 5 (OH) 6 (CO 3 ) 2 has a greatly higher oxidation potential (5.05 V) than ZnCO 3 (3.17 V), suggesting a high oxidizing ability of Zn 5 (OH) 6 (CO 3 ) 2 . Under ultraviolet light irradiation (λ≤400 nm), 92% of MB can be degraded by Zn 5 (OH) 6 (CO 3 ) 2 after 80 min, which is 2.31 times as high as that of ZnCO 3 , although Zn 5 (OH) 6 (CO 3 ) 2 has a lower BET area (5.8 m 2 g −1 ) than ZnCO 3 (7.7 m 2 g −1 ). This work favors to insight into the correlation of crystal atoms with photochemistry property for a photocatalyst.