Magnetic N-rich carbon nitride framework material for the high selectivity extraction and determination of La(III)

• Published in: Talanta (Oxford) Vol. 225; p. 122086
• Main Authors: Kang, Jing-Yan, Ha, Wei, Shi, Yan-Ping
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.04.2021
• Subjects: Adsorption mechanism; High selectivity adsorption; La(III) analysis; N-rich carbon nitride material; La(III) analysis; N-rich carbon nitride material; High selectivity adsorption; Adsorption mechanism
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2021.122086

A novel magnetic C3N5 framework material (Fe3O4/C3N5) was developed as a high selectivity extractant for La(III) determination in food samples. The Fe3O4/C3N5 material was synthesized by thermal deammoniation method and has larger surface area (100.3 m2 g−1) and more effective adsorption sites compared with that of individual C3N5 material (19.4 m2 g−1). It was proved that Fe3O4/C3N5 material displayed excellent selectivity and adsorption capacity for La(III). In addition, adsorption isotherm and kinetic data indicated that La(III) adsorption based on Fe3O4/C3N5 material is a monolayer adsorption which is compatible with Langmuir model and follows a pseudo-second-order kinetic equation. By using Fe3O4/C3N5 material 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−1 and the content of 138La is 0.138 μg kg−1, which is 1.03% of total La(III). A novel magnetic N-rich carbon nitride framework material (Fe3O4/C3N5) was developed, which displayed excellent absorbability and selectivity for La(III). The adsorption mechanism was investigated and the analytical method for La(III) was established and successfully applied in the determination of La(III) and radionuclide 138La in complex matrix samples. [Display omitted] •Magnetic N-rich C3N5 material was synthesized and applied for the extraction of La(III).•Fe3O4/C3N5 framework material displayed excellent extraction capacity and selectivity for La(III).•Thermodynamics and kinetics of adsorption based on Fe3O4/C3N5 material was investigated in detail.•The potential application of the proposed method was evaluated by MSPE of La(III) in complex samples.