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HPW/PDMAEMA‐b‐PMAA/ZIF‐8 Ternary Lamellar Composite and the Photocatalytic Degradation of Methylene Blue
Author(s) -
Ma Yehui,
Wang Xiaobei,
Ye Jin,
Ge Kai,
Wang Yuanyuan,
He Jiahui,
Zhang Yue,
Yang Yongfang
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201801785
Subject(s) - copolymer , materials science , lamellar structure , composite number , photocatalysis , phosphotungstic acid , ternary operation , x ray photoelectron spectroscopy , chemical engineering , polymerization , methylene blue , scanning electron microscope , polymer chemistry , chemistry , composite material , organic chemistry , polymer , catalysis , computer science , engineering , programming language
PDMAEMA‐b‐PMAA block copolymers were prepared by the sequential RAFT polymerization of DMAEMA and t BMA, followed by hydrolysis. Phosphotungstic acid (HPW) was anchored to the PDMAEMA blocks through electrostatic interactions and the as‐obtained HPW/PDMAEMA‐b‐PMAA was added to the synthesis of ZIF‐8. During the formation of ZIF‐8, the PMAA blocks coordinated to the Zn 2+ ions through their carboxy groups, along with the HPW groups that were anchored to the PDMAEMA blocks. In this way, the block copolymer could consolidate the interactions between HPW and ZIF‐8 and prevent the leakage of HPW. Finally, the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 ternary lamellar composite was obtained and the structure of the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 hybrid material was characterized by using powder X‐ray diffraction (PXRD), X‐ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). As a photocatalyst, the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 ternary lamellar composite showed excellent photoactivity for the degradation of methylene blue (MB). The rate of degradation of MB was 0.0240 min −1 , which was 7.5‐times higher than that of commercially available P25 (0.0032 min −1 ). In the presence of H 2 O 2 , the kinetic degradation parameters of the composite reached 0.0634 min −1 , which was about 19.8‐times higher than that of P25.