Journal
JOURNAL OF POROUS MATERIALS
Volume 27, Issue 4, Pages 1171-1177Publisher
SPRINGER
DOI: 10.1007/s10934-020-00895-z
Keywords
Metal-organic frameworks; Magnetic solid-phase extraction; Enrichment; High performance liquid chromatography; Pesticides
Funding
- National Natural Science Foundation of China [21467028, 21777129]
- Innovative Team of Ministry of Education of China [IRT15R56]
- Talent Project of Innovation and entrepreneurship in Lanzhou, China [2018-RC-40]
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In this work, an octahedral magnetic metal organic frameworks composed of Fe3O4@NH2-MIL-101 was synthesized through simple solvothermal reaction for magnetic solid phase extraction (MSPE) of six pesticides with benzene ring in environmental water samples. The Fe3O4@NH2-MIL-101 was characterized by various techniques. The results showed Fe3O4@NH2-MIL-101 exhibits ultra-high surface area (1012.7 m(2) g(-1)), large pore volume (0.64 cm(3) g(-1)) and high magnetic responsivity (30.0 emu g(-1)), which can be used as an ideal adsorbent for rapid isolation and enrichment of target analytes. A sensitive method was developed by using Fe3O4@NH2-MIL-101-based MSPE coupled with HPLC (High performance liquid chromatography) with UV (Ultraviolate) detector. The linear range extended to 1000 mu g L-1 was achieved, low limits of detection (S/N = 3) of 0.13-0.86 mu g L-1 and good reproducibility (1.8-3.1%). The applicability of Fe3O4@NH2-MIL-101 was demonstrated for determining six pesticides in water samples with satisfactory recoveries at two spiking levels of 20.0, 80.0 mu g L-1 were in the range of 70.5 to 119.8% with the RSDs less than 8.1%. These accurate experimental results by this method indicated that the novel Fe3O4@NH2-MIL-101 as a MSPE adsorbent was an attractive option for efficient extraction and enrichment trace pesticides in future.
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