title: Rapid magnetic solid-phase extraction of Congo Red and Basic Red 2 from aqueous solution by ZIF-8@CoFe2 O4 hybrid composites.
abstract: 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 CoFe2 O4 -Zeolitic Imidazolate Framework-8 (ZIF-8@CoFe2 O4 ) 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@CoFe2 O4 is 3.3 emu/g, which is large enough for magnetic separation. The obtained hybrid magnetic metal-organic framework based material ZIF-8@CoFe2 O4 can remove the investigated dyes very fast within 1 min of the contact time. The adsorbent ZIF-8@CoFe2 O4 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@CoFe2 O4 sorbents for the fast separation and preconcentration of organic pollutants in aqueous solution before high-performance liquid chromatography analysis.
authors.affiliation: Department of Chemistry, College of Science, Northeastern University, Shenyang, China. xuyanjlu@126.com.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Department of Chemistry, College of Science, Northeastern University, Shenyang, China.
authors.forename: Jingjie
authors.initials: J
authors.lastname: Jin
authors.affiliation: College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang, China. lixianliang007@163.com.
authors.forename: Xianliang
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Chemistry, College of Science, Northeastern University, Shenyang, China.
authors.forename: Yide
authors.initials: Y
authors.lastname: Han
authors.affiliation: Department of Chemistry, College of Science, Northeastern University, Shenyang, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Meng
authors.affiliation: Department of Chemistry, College of Science, Northeastern University, Shenyang, China.
authors.forename: Junbiao
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Chemistry, College of Science, Northeastern University, Shenyang, China. xzhang@mail.neu.edu.cn.
authors.forename: Xia
authors.initials: X
authors.lastname: Zhang
keywords: Core-shell materials; Magnetic separation; Metal-organic frameworks; Solid-phase extraction