ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

A novel post-synthetic modification of magnetic MIL-101(Cr) metal–organic framework with 1,8-diaminonaphthalene chelator and its utilization for separation/determination of cadmium and nickel in food samples

Mahnaz Barzin and Mohsen Pooladi

Department of Medicinal Chemistry, Pharmaceutical Science Branch, Islamic Azad University, Tehran, Iran

E-mail: Mahnaz.barzin@gmail.com

Received: 9 January 2022  Accepted: 4 May 2022

Abstract:

This research describes a novel post-synthetic modification of magnetic metal–organic framework with 1,8-diaminonaphthalene chelator and its utilization in the separation/extraction of cadmium and nickel ions from food samples. This is the first report on the post-synthetic modification of a metal–organic framework with 1,8-diaminonaphthalene chelator and its use in the separation/extraction of Cd(II) and Ni(II) in food matrixes. The fabricated material was characterized by scanning electron microscopy, X-ray diffraction, vibrating sample magnetometry, and Fourier transform infrared techniques. Afterward, a Box–Behnken design method was used to explore the factors affecting preconcentration performance. The best uptake% was obtained by adjusting the pH of the solution at 6.5, performing the extraction for 9.0 min, and using a 30 mg adsorbent dose. In the elution step, the best efficiency was attained by using 1.25 mL of 1.0 mol/L nitric acid as an eluent and by conducting the extraction for 11.0 min. The limits of detection were 0.07, and 0.2 µg L⁻¹ for Cd(II), and Ni(II) ions, respectively. The linear dynamic ranges for Cd(II), and Ni(II) are 0.2–120 and 0.7–150 µg L⁻¹, respectively. The repeatability of the new method at three concentration level of 1.0, 10.0, and 100 μg L⁻¹ (n = 3) was 10.8%, 8.5% and 6.0%, respectively. The maximum adsorption capacities were 213 mg/g for Cd(II), and 195 mg/g for Ni(II). Ultimately, the new material was used in the separation/determination of trace amounts of Cd(II) and Ni(II) ions in food samples, and the favorable results were attained (Relative recovery, 86–112%; RSD%, < 9.3%).

Keywords: Magnetic adsorbent; Metal–organic framework; Post-synthetic modification; Cadmium; Nickle; Food matrixes

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02265-2

Chemical Papers 76 (9) 5561–5570 (2022)