A novel poly(2-mercaptobenzothiazole) coated magnetic nanoadsorbent derived from ZIF-8 for preconcentration/determination of palladium and silver. Issue 55 (15th December 2022)

• Record Type: Journal Article
• Authors: Mohseni, Seyedeh Fatemeh; Manoochehri, Mahboobeh; Afshar Taromi, Faramarz
• Is Part Of: RSC advances. Volume 12:Issue 55(2022)
• Page Start: 35849
• Page End: 35859
• Publication Date: 2022-12-15
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra06193g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A novel poly(2-mercaptobenzothiazole) coated magnetic nanoadsorbent derived from zeolitic-imidazole framework-8 was synthesized and then employed for the extraction/preconcentration of trace amounts of palladium and silver in various real matrixes. Abstract : Herein, a novel poly(2-mercaptobenzothiazole) coated magnetic nanoadsorbent derived from zeolitic-imidazole framework-8 (ZIF-8) was synthesized and then employed for the extraction/preconcentration of trace amounts of palladium and silver in various real matrixes. In this way, magnetite was fabricated first, and then functionalized with tetraethyl orthosilicate. After that, the synthesized magnetite@silica was coated with the ZIF-8 to obtain magnetic ZIF-8. Afterward, the magnetic ZIF-8 was pyrolyzed under the protection of a nitrogen atmosphere to get a magnetic carbon nanoadsorbent. Finally, the magnetic carbon was functionalized with a conductive polymer (poly-2-mercaptobenzothiazole). Fabrication of the nanoadsorbent was affirmed with scanning and transmission electron microscopies, elemental analysis, X-ray diffraction, Fourier transform infrared spectroscopy, and vibrating sample magnetometry. The method is linear from 0.25 to 200 μg L −1 for silver, and from 0.5 to 250 μg L −1 for palladium. The detection limits are 0.07 and 0.15 μg L −1 for Ag and Pd, respectively. The precision was evaluated at three concentration levels (1, 75, 200 μg L −1, n = 5) and all the relative standard deviation (RSD) values were lower than 10.3%. In the end, the new method was utilized for the preconcentration/determination of trace amounts of palladium and silver in various real matrixes, satisfactorily (relative recovery: 86% to 104%; RSD%: 4.0–9.5%).