4.7 Article

Ultrasound-assisted dispersive solid phase extraction for promoting enrichment of ng L-1 level Hg2+ on ionic liquid coated magnetic materials

期刊

ANALYTICA CHIMICA ACTA
卷 1181, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.aca.2021.338906

关键词

Protonic ionic liquid adsorbent; Acoustic frequency and power; Dye; paper method; Slurry cold vapor generation; Ultrasound-assisted magnetic solid-phase extraction

资金

  1. National Natural Science Foundation of China [21676002]
  2. Anhui Provincial National Science Fund for Excellent Young Scholars [1908085J09]
  3. Key Research and Development Program of AnHui Province [202104i07020007]

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The study demonstrates that the enrichment efficiency of magnetic adsorbent for mercury (Hg2+) can be significantly improved by ultrasound input, with ultrasound parameters being key factors affecting magnetic solid phase extraction. Furthermore, slurry vapor generation technology enables in-situ desorption and detection of adsorbate, as well as effective recovery of the adsorbent.
Herein, we investigated the enrichment behavior of inorganic mercury (Hg2+) on magnetic adsorbent with different ultrasound (US) energy field input. The enrichment rate of 0.10 mg L-1 mercury is increased by 4.5 times after US instead of stirring as dispersion mode. The input of higher frequency and power ultrasound can accelerate the enrichment of magnetic ionic liquid adsorbent and reduce the Hg2+ residue, importantly, which has not been reported. The positive correlation between cavitation effect and acoustic frequency and power in imaging experiments documents that US parameters are the key factors affecting the magnetic solid phase extraction. In addition, in-situ desorption and detection of adsorbate and recovery of adsorbent can be realized by slurry vapor generation (SVG) technology. The recovery of Hg2+ in four cycles is more than 90%, which indicates that the structure and properties of the material are not affected by the application of US. Hence, the degradation of adsorption properties caused by agglomeration of magnetic materials can be improved by introducing dispersion methods such as US. At the same time, 95% enrichment efficiency and 0.01e1.0 mg L-1 linear calibration range corresponding to 150 mL sample documents that magnetic ionic liquid adsorbent combined with US and sensitive spectral detector can meet the needs of ng L-1 level Hg2+ analysis in natural water samples. (c) 2021 Elsevier B.V. All rights reserved. Superscript/Subscript Available

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