Synthesis of graphene oxide/polyaniline nanocomposite for measuring cadmium(II) by solid phase extraction combined with dispersive liquid-liquid microextraction

An analytical route containing solid-phase extraction combined with dispersive liquid-liquid microextration (SPE-DLLME), was established to determine Cd ions in water samples. In this regard, Graphene oxide/polyaniline nanocomposite was synthesized through chemical method and then the graphene oxide/polyaniline nanocomposite was characterized by using XRD, FESEM, FTIR and TGA techniques. The prepared nanocomposite was investigated as a adsorbent in the presence of chelating dithizone ligand in solid phase extraction with dispersive liquid-liquid microextraction and used to measure cadmium (II) ions in aqueous media. In this method, firstly; single-variable parameters such as the amount of adsorbent, extraction time, type of desorption solvent, desorption time were investigated. Then, with using the design of expert, the parameters affecting the extraction efficiency such as the effect of salt addition (ionic strength), pH, volume of extraction solvent and the volume of dispersive solvent have been optimized. The analytical figure of merit such as limit of detection (0.1 mu g L-1), limit of quantification (0.4 mu g L-1), linear dynamic ange (0.4-1000 mu g L-1), repeatability (%1.3), enrichment factor (210) and relative recovery percentage (99%), were obtained for cadmium (II) spike aqueous samples. Finally, the method was successfully used and evaluated for the extraction and quantification of Cd ions from real samples and relative recoveries varied from 91%-107%.