Rapid magnetic solid-phase extraction of Congo Red and Basic Red 2 from aqueous solution by ZIF-8@CoFe2O4 hybrid composites
Rapid magnetic solid-phase extraction of Congo Red and Basic Red 2 from aqueous solution by ZIF-8@CoFe2O4 hybrid composites
复制标题
ZIF-8@CoFe2O4杂化复合材料从水溶液中快速磁固相萃取刚果红和碱性红2
DOI：
10.1002/jssc.201600630
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发表时间：
2016-09-01
影响因子：
3.1
通讯作者：
Zhang, Xia
中科院分区：
文献类型：
--
作者：
Xu, Yan;Jin, Jingjie;Zhang, Xia
核-壳结构金属有机骨架材料由于具有比单组分结构材料更好的物理化学性能而引起了人们的广泛关注。本工作成功制备了CoFe 2 O 4-沸石咪唑骨架-8（ZIF-8@CoFe2O4）核-壳异质结构，并将其用作固相萃取吸附剂，从污染水溶液中高效萃取刚果红和碱性红2染料。振动样品磁强计测试表明，ZIF-8@CoFe2O4的饱和磁化强度为3.3emu/g，满足磁分离要求。所获得的混合磁性金属-有机骨架基材料ZIF8@CoFe2O4可以在1分钟的接触时间内非常快速地去除所研究的染料。吸附剂ZIF-8@CoFe_2 O_4也显示出良好的重复使用性。再生后的吸附剂对刚果红的去除率可达97%左右。该研究揭示了核壳型ZIF-8@CoFe2O4吸附剂在高效液相色谱分析前快速分离和富集水溶液中有机污染物方面的巨大潜力。
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 CoFe2O4-Zeolitic Imidazolate Framework-8 (ZIF-8@CoFe2O4) 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@CoFe2O4 is 3.3 emu/g, which is large enough for magnetic separation. The obtained hybrid magnetic metal-organic framework based material ZIF8@CoFe2O4 can remove the investigated dyes very fast within 1 min of the contact time. The adsorbent ZIF-8@CoFe2O4 also shows a good reusability. After regeneration, the adsorbent can still exhibit high removal efficiency (similar to 97%) toward Congo Red for five cycles of desorption-adsorption. This work reveals the great potential of core-shell ZIF-8@CoFe2O4 sorbents for the fast separation and preconcentration of organic pollutants in aqueous solution before high-performance liquid chromatography analysis.