Magnetic N-rich carbon nitride framework material for the high selectivity extraction and determination of La(III).
Magnetic N-rich carbon nitride framework material for the high selectivity extraction and determination of La(III).
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DOI：
10.1016/j.talanta.2021.122086
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发表时间：
2021-04
期刊：
影响因子：
6.1
通讯作者：
Jing-yan Kang;Wei Ha;Yan-Ping Shi
中科院分区：
文献类型：
--
作者：
Jing-yan Kang;Wei Ha;Yan-Ping Shi
A novel magnetic C3N5framework material (Fe3O4/C3N5) was developed as a high selectivity extractant for La(III) determination in food samples. The Fe3O4/C3N5material was synthesized by thermal deammoniation method and has larger surface area (100.3 m2g−1) and more effective adsorption sites compared with that of individual C3N5material (19.4 m2g−1). It was proved that Fe3O4/C3N5material displayed excellent selectivity and adsorption capacity for La(III). In addition, adsorption isotherm and kinetic data indicated that La(III) adsorption based on Fe3O4/C3N5material is a monolayer adsorption which is compatible with Langmuir model and follows a pseudo-second-order kinetic equation. By using Fe3O4/C3N5material as extractant, an analytical method was established with low limits of detection (3σ, n = 6) of 10.4 μg L−1, reasonable recoveries ranged from 86% to 106% and good precision with the RSD less than 10.7%. The analytical method was further applied to the determination of trace La(III) in food sample. It evinced that the concentration of La(III) in sea fish is 13.2 μg kg−1and the content of138La is 0.138 μg kg−1, which is 1.03% of total La(III).
