Synthesis and application of metal-organic framework functionalized with poly)indole( to extract and measure phenolic compounds in environmental samples
Subject Areas :
Mahboobeh Manoochehri
1
,
sabrali nouri
2
1 - islamic azad university central tehran branch chemistry department
2 - islamic azad university central tehran branch chemistry department
Keywords: Metal-organic framework, Magnetic nanosorbent, Polyindole, Preconcentration, Extraction, Measurement of nitrophenols,
Abstract :
In this research, a new nanoabsorbent was synthesized based on a metal-organic magnetic framework coated with polyindole. This nanoabsorbent was then used for the extraction, pre-concentration, and determination of small amounts of nitrophenols in water samples. First, the synthesized adsorbent was identified using various methods including x-ray diffraction (XRD), Fourie transform infrared spectroscopy (FTIR), Vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The SEM and TEM images confirmed the nanostructure of the adsorbent, while the XRD pattern checked and confirmed its phase structure. Additionally, the VSM results showed that the synthesized nanoabsorbent has superparamagnetic properties. Finally, all of these methods confirmed the successful synthesis of the nanoabsorbent. The central composite design (CCD) method was employed to identify and optimize the parameters that affect pre-concentration. After adsorption and washing, nitrophenols were measured using a high-performance liquid chromatography device equipped with an ultraviolet detector. The optimal extraction conditions were as follows: pH of the sample solution, 9.5; absorption time, 3.7 minutes; amount of absorbent, 27.5 mg; sample volume, 75 ml; washing solvent, 200 μl of 0.01 M hydrochloric acid in acetonitrile; desorption time, 3 minutes without adding salt to the sample solution. Under these optimal conditions, the limit of detection and the linear range of the calibration curve were obtained in the range of 0.15-0.25 and 5.0-300 µg/liter, respectively. The relative standard deviation of the method, as a measure of accuracy, was obtained in the range of 4.5-4.6%. Finally, the desired adsorbent was used for rapid extraction and pre-concentration of nitrophenols in water samples
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