Facile synthesis of a modified HF-free MIL-101(Cr) nanoadsorbent for extraction nickel in water and wastewater samples

A novel sorbent based on mil-101(cr) nanoadsorbent as a mof structure was used for nickel extraction from water and wastewater samples. in this study, 30 mg of mil-101(cr) nanoadsorbent dispersed in 50 ml of water or wastewater samples, after sonication and adjusting ph =8.5, the nickel ions was extracted by carboxyl groups of terephthalic acid (mof─(c6h4 (coo)2-…. ni^2+) by dispersive suspension-micro solid-phase extraction (ds-μ-spe). the mof was separated from liquid phase with filter membrane (0.2 μm), eluted with 0.5 ml of nitric acid as back-extraction solution and finally, the nickel concentration in elution was determined by atom trap-flame atomic absorption spectrometry (at-faas) after dilution with dw up to 1 ml. the lod, the linear range and preconcentration factor were achieved 1.5 μg l^−1, 5-160 μg l^−1 and 49.7, respectively. the absorption capacity of mof for nickel was obtained 136.8 mg g^-1. the results of procedure were validated by spiking of samples and et-aas analyzer.