Synthesis and application of hydrophilic 2-aminothiophenol magnetic nanoadsorbent for the preconcentration and determination of phenol

چکیده مقاله

Phenolic compounds are chemical substances that are present in many industrial processes and as a consequence, they are released in many industrial effluents and waste water. Due to their toxicity and persistence in the environment, have adverse effects on the environment and human health. Phenols are the most important organic compounds in the wastewater of various manufacturing industries including resin industries, herbicides, glass making, oil refining, dyes and pesticides. Phenol is used in low concentrations as a disinfectant in household cleaners. Phenol is completely toxic and its concentrated solutions cause severe burning of the skin and mucous membrane. Therefore, monitoring and determination of phenol is an important analytical task. In this work, the magnetic 2-aminothiophenol triethylene glycol monomethyl ether (γ-Fe2O3-2-ATP-TEG-MME) is synthesized and characterized by Fourier-transform infrared spectroscopy (FT-IR), Transmission electron microscopy (TEM), Vibrating sample magnetometer (VSM) and Thermal gravimetric analysis (TGA) techniques and used as nanosorbent in the magnetic dispersive microsolid phase extraction (MD-μSPE) method for the determination of phenol. In MD-μSPE method, the adsorbent is dispersed in sample solution by ultrasonic, and after completing the absorption of the analyte, the absorbent is separated by a magnet from the solution, and then the analyte solution is transferred to the spectrofluorimetry. To examine the most important parameters including amount of sorbent, pH of the solution, extraction time and desorption time on the M D-μSPE, a four factor central composite design (CCD) combined with response surface modeling (RSM) was accomplished .Under optimum conditions, limit of detection (LOD), limit of quantitation (LOQ), and relative standard deviation (RSD) of the method were found to be 1.65 ng mL-1, 5.44 ng mL-1and 3.93 %, respectively. The MD-μSPE method based on the hydrophilic 2-aminothiophenol as nanosorbent successfully applied to determination of target analyte in various water and honey samples.