title: A metal organic framework-polyaniline nanocomposite as a fiber coating for solid phase microextraction.
abstract: A metal organic framework-polyaniline (MOF/PANI) nanocomposite was electrodeposited on a stainless steel wire and used as a solid phase microextraction (SPME) fiber coating. The electropolymerization process was carried out under a constant deposition potential and applied to the corresponding aqueous electrolyte containing aniline and MOF particles. The employment of MOFs with their large and small cages and 3-D structures in synthesizing a nanocomposite was assumed to be efficient constitutes to induce more non-smooth and porous structures, approved by scanning electron microscopy (SEM) images. Three different MOFs were incorporated to synthesize the desired nanocomposites and the preliminary experiments showed that all of them, particularly the one containing MOF2, have higher extraction performances in compared with PANI. The applicability of the new fiber coating was examined by headspace-solid phase microextraction (HS-SPME) of some chlorobenzenes (CBs) from aqueous samples. Influencing parameters on the synthesize and extraction processes including the electrodeposition voltage and its duration time, the weight ratio of PANI and MOF, the ionic strength, desorption temperature and time, and extraction time and temperature were optimized. The developed method was validated by analyzing the spiked distilled water and gas chromatography-mass spectrometry (GC-MS). Under optimum condition, the relative standard deviation (RSD%) values for a double distilled water spiked with the selected CBs at 20ngL(-1) were 5-8% (n=3) and the detection limits were below 0.2ngL(-1). The linear dynamic range (LDR) of the method was in the concentration range of 0.5-1000ngL(-1) (R(2)>0.9994). The fiber-to-fiber reproducibility was found to be in the range of 4-7%. Eventually, various real-water samples were analyzed by the MOF/PANI-based HS-SPME and GC-MS and the relative recovery values were found to be in the range of 92-98%.
authors.affiliation: Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran. Electronic address: bagheri@sharif.edu.
authors.forename: Habib
authors.initials: H
authors.lastname: Bagheri
authors.affiliation: Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran.
authors.forename: Hasan
authors.initials: H
authors.lastname: Javanmardi
authors.affiliation: School of Chemistry, College of Science, Tehran University, Tehran, Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Abbasi
authors.affiliation: Environmental and Bio-Analytical Laboratories, Department of Chemistry, Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran.
authors.forename: Solmaz
authors.initials: S
authors.lastname: Banihashemi
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002722:Chlorobenzenes / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D009994:Osmolar Concentration; D015203:Reproducibility of Results; D052617:Solid Phase Microextraction / Q000379:methods*; D013193:Stainless Steel / Q000737:chemistry; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D000814:Aniline Compounds; D002722:Chlorobenzenes; D014874:Water Pollutants, Chemical; C416807:polyaniline; D013193:Stainless Steel
keywords: Chlorobenzenes; Fiber coating; Headspace-solid phase microextraction; Metal organic framework-polyaniline nanocomposite