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Rapid magnetic solid‐phase extraction of Congo Red and Basic Red 2 from aqueous solution by ZIF‐8@CoFe 2 O 4 hybrid composites
Author(s) -
Xu Yan,
Jin Jingjie,
Li Xianliang,
Han Yide,
Meng Hao,
Wu Junbiao,
Zhang Xia
Publication year - 2016
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201600630
Subject(s) - congo red , aqueous solution , adsorption , imidazolate , materials science , zeolitic imidazolate framework , desorption , extraction (chemistry) , metal organic framework , solid phase extraction , phase (matter) , chemical engineering , nanocomposite , analytical chemistry (journal) , chromatography , chemistry , composite material , inorganic chemistry , organic chemistry , engineering
Core–shell metal–organic framework materials have attracted considerable attention mainly due to their enhanced or new physicochemical properties compared with their single‐component counterparts. In this work, a core–shell heterostructure of CoFe 2 O 4 ‐Zeolitic Imidazolate Framework‐8 (ZIF‐8@CoFe 2 O 4 ) is successfully fabricated and used as an solid‐phase extraction adsorbent to efficiently extract Congo Red and Basic Red 2 dyes from contaminated aqueous solution. Vibrating sample magnetometry indicates that the saturated magnetization of ZIF‐8@CoFe 2 O 4 is 3.3 emu/g, which is large enough for magnetic separation. The obtained hybrid magnetic metal‐organic framework based material ZIF‐8@CoFe 2 O 4 can remove the investigated dyes very fast within 1 min of the contact time. The adsorbent ZIF‐8@CoFe 2 O 4 also shows a good reusability. After regeneration, the adsorbent can still exhibit high removal efficiency (∼97%) toward Congo Red for five cycles of desorption–adsorption. This work reveals the great potential of core–shell ZIF‐8@CoFe 2 O 4 sorbents for the fast separation and preconcentration of organic pollutants in aqueous solution before high‐performance liquid chromatography analysis.