Abstract
In this research, Zn2(BDC)2(DABCO) metal–organic framework (MOF) as a solid phase was used for separation and preconcentration toxic nickel ions (Ni) from water samples by ultrasound assisted-dispersive-micro solid phase extraction coupled to electrothermal atomic absorption spectrometry (USA-D-μ-SPE/ET-AAS). The MOF nanostructure was characterized by field emission-scanning electron microscope (FE-SEM) and transmission electron microscopey (TEM) for presentation of morphology and size of MOF synthesis. By procedure, 25 mg of Zn2(BDC)2(DABCO) as MOF adsorbent was added to 25 mL of water samples and then, Ni ions chemically adsorbed based on dative bonding of nitrogen in DABCO (1,4-diazabicyclo [2.2. 2]octane); N2(C2H4)3) at pH=8. The adsorbent was separated from liquid phase by syringe cellulose acetate filters (SCAF, 0.2 μm) and Ni ions back extracted from MOF adsorbent before determined by ET-AAS. The maximum recovery of MOF for nickel ions as a physically and chemically adsorption was obtained 34.6% and 98.8% at pH=3 and 8, respectively.
Highlights
The water pollution is one of the most important issues in the world today [1,2]
The ZnMOF adsorbent based on USA-D-μ-solid-phase extraction (SPE) procedure was used for nickel adsorption/extraction from water samples and the concentration of nickel ions determined by electrothermal atomic absorption spectrometry (ET-AAS)
There is no peak based on impurities and and it confirm the completion of the synthesis
Summary
The water pollution is one of the most important issues in the world today [1,2]. The high concentration of heavy metals in environment has been attributed to population growth, economic. The ZnMOF adsorbent based on USA-D-μ-SPE procedure was used for nickel adsorption/extraction from water samples and the concentration of nickel ions determined by ET-AAS. General procedure of nickel adsorption By proposed method, the Zn2(BDC)2(DABCO) as metal–organic framework (MOF) was used for extraction of toxic nickel ions (Ni2+) from water samples by USA-D-μ-SPE procedure (Fig.). 25 mg of Zn2(BDC)2(DABCO) adsorbent added to 25 mL of water samples included Ni standard solution and Ni ions chemically adsorbed based on dative bonding of nitrogen groups in DABCO material after shaking for 10 min at pH=8. The Zn2(BDC)2(DABCO) adsorbent separated from water samples by SCAF (10 mL, 0.2 μm) and the Ni loaded on the MOF was back-extracted from solid-phase based on changing pH by nitric acid solution (0.2 M, 0.25 mL). The calibration curve for nickel in was prepared from LLOQ to ULOQ ranges (0.1-2.88 μg L−1) and the PF obtained by the curve-fitting rule
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