A novel magnetic poly(aniline-naphthylamine)-based nanocomposite for micro solid phase extraction of rhodamine B

• A Fe3O4–aniline-naphthylamine nanocomposite was prepared via a simple route.
• The magnetic nanocomposite was applied for isolation of RhB from water.
• The nanocomposite applicability was compared with other pristine polymers.
• The method was applied for the determination of RhB in different samples.

A novel Fe3O4–poly(aniline-naphthylamine)-based nanocomposite was synthesized by chemical oxidative polymerization process as a magnetic sorbent for micro solid phase extraction. The scanning electron microscopy images of the synthesized nanocomposite revealed that the copolymer posses a porous structure with diameters less than 50 nm. The extraction efficiency of this sorbent was examined by isolation of rhodamine B, a mutagenic and carcinogenic dye, from aquatic media in dispersion mode. Among different synthesized polymers, Fe3O4/poly(aniline-naphthylamine) nanocomposite showed a prominent efficiency. Parameters including the desorption solvent, amount of sorbent, desorption time, sample pH, ionic strength, extraction time and stirring rate were optimized. Under the optimum condition, a linear spiked calibration curve in the range of 0.35–5.00 μg L−1 with R2 = 0.9991 was obtained. The limits of detection (3Sb) and limits of quantification (10Sb) of the method were 0.10 μg L−1 and 0.35 μg L−1 (n = 3), respectively. The relative standard deviation for water sample with 0.5 μg L−1 of RhB was 4.2% (n = 5) and the absolute recovery was 92%. The method was applied for the determination of rhodamine B in dishwashing foam, dishwashing liquid, shampoo, pencil, matches tips and eye shadows samples and the relative recovery percentage were in the range of 94–99%.

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