Facile synthesis of a modified HF-free MIL-۱۰۱(Cr) nanoadsorbent for extraction nickel in water and wastewater samples

A novel sorbent based on MIL-۱۰۱(Cr) nanoadsorbent as a MOF structure was used for nickel extraction from water and wastewater samples. In this study, ۳۰ mg of MIL-۱۰۱(Cr) nanoadsorbent dispersed in ۵۰ mL of water or wastewater samples, after sonication and adjusting pH =۸.۵, the nickel ions was extracted by carboxyl groups of terephthalic acid (MOF─(C۶H۴ (COO)۲-…. Ni۲+) by dispersive suspension-micro solid-phase extraction (DS-μ-SPE). The MOF was separated from liquid phase with filter membrane (۰.۲ μm), eluted with ۰.۵ 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 ۱ mL. The LOD, the linear range and preconcentration factor were achieved ۱.۵ μg L−۱, ۵-۱۶۰ μg L−۱ and ۴۹.۷, respectively. The absorption capacity of MOF for nickel was obtained ۱۳۶.۸ mg g-۱. The results of procedure were validated by spiking of samples and ET-AAS analyzer.