مشخصات پژوهش

In this research a novel thin film microextraction (TFME) method was developed using zinc oxide nanoparticles/polyamide (ZnO NPs/PA) nanocomposite as extracting media. Nanostructured ZnO was prepared by dissolution reprecipitation of micro-sized ZnO powder ZnO NPs reinforced polyamide PA was prepared by solvent blending of ZnO NPs and PA in formic acid[1]. The prepared nanocomposite was coated onto a filter paper as thin film substrate by solvent exchange method. This process leads to formation of a thin layer of the prepared nanocomposite onto substrate. The characterization of prepared ZnO NPs and ZnO NPs/PA nanocomposite were investigated using scanning electron microscopy (SEM) and Xray diffraction (XRD). The prepared ZnO NPs/PA nanocomposite-based thin film was applied as an extraction device for extraction of ibuprofen in waste water samples in combination with gas chromatography-flame ionization detector (GC-FID) [2]. The thin film preparation method was investigated by studying the extraction efficiency of two thin films which were prepared by solvent exchange method and casting method. Also the effect of paper filter as substrate was evaluated. Furthermore, the effect of ZnO NPs doping level in the nanocomposite on the extraction capability of the thin film was investigated and it was found that 10 % doping level of ZnO NPs into PA has led to the best results. Box-Behnken design (BBD) was employed to investigate and optimize important factors influencing the extraction and desorption processes including extraction time, salt content, pH, desorption solvent, its volume and desorption time. Finally the developed method was successfully applied to the extraction and determination of ibuprofen in waste water sample, indicating the applicability of the proposed method to determine such pollutant compounds in aqueous samples[3].