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

Abstract

A novel sorbent based on MIL-101(Cr) nanoadsorbent as 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…. Ni2+) 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 eluent 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.

Adsorption of diazinon using Cd-MOF nanoparticles before determination by UV-Vis spectrometer: isotherm, kinetic and thermodynamic study

“…Cd MOF was synthesized according to the previous reports with minor modifications [20]. 8.9 g Cd(NO 3 ) 2 .4H 2 O, 5.22 g fumaric acid, and 3.6 g NaOH were dispersed in 50 mL ultrapure water and were stirred for 30 minutes.…”

“…For determining percentages of removal various methods such as simulation, spectroscopy, and chromatography have been used [14,15]. Various materials such as multi-walled carbon nanotubes [16], activated carbon [17], bismuth oxide-fullerene nanoparticles [18], mesoporous silica [19] and , metal-organic frameworks [20] and other porous materials [21] have been used as adsorbents. Metal-organic framework, which is composed of metal ions or clusters of organic linkers, are crystalline materials that have a variety of applications in the removal of contaminants [22] drug delivery [23], catalysis [24] separation [19], electronic devices [25] gas storage [26], and sensors [27].…”

“…Due to the adjustable porosity, high surface area, adsorptive properties, and variety of structures MOFs are effective agents for the removal of pesticides from water. MOFs are synthesized using many methods such as ionothermal [28], solvent evaporation [29], self-assembly of primary building blocks [30], mechanochemical [31], electrochemical [32], ultrasonic [33], microwave [34], solvothermal [35] and hydrothermal [20,36] methods. In this work, Cd MOF was prepared using a hydrothermal route.…”