Nanomaterials based on nano goethite are widely used as sorbents of various Hg2+, Pb2+ ions, as well as destructors of pesticides. As a result, the production of new nanocomposites is an urgent task extending the field of application.The FeO(OH) nanoparticles were synthesized by the coprecipitation method using an iron(II)sulfate solution in the presence of PVP (poly-N-vinylpyrrolidone (MW = 8000). The Fe2+: PVP molar ratio was 2: 0.1. The solution was subjected to hydrolysis in the presence of ammonia for 5 h. The solid phase was precipitated in the form of a nanopowder based on the resulting nanogoethite colloids stabilized by PVP. The solid phase was analyzed using different methods: XRD, FT-IR , microscopy(SEM). Xray phase analysis of FeOOH powders is carried out on a diffractometer ДРОН-УМ ( θ - 2θ method, Fe K0- radiation, λ=1.93604 Å). Observed diffraction peaks of FeO(OH): 2 27.00 , 34.50 , 38.20⁰ , 42.150 , 45.300 , 50.000 , and 81.900 , 84.500 , are referred to the orthorhombic phase of nanoparticles (space group Pbnm, a = 4.608 Å, b = 9.956 Å, 3.0215 Å). The linear size of the nanoparticles, calculated from the half-width of the diffraction peaks, is 58 +- 5 nm, which is confirmed by SEM microscopy (Fig.1). The FTIR spectra of PVP coated FeO(OH) nanoparticles and pure FeO(OH) (Fig. 2). The characteristic and distinct bands of goethite with wavenumbers of 790 cm-1 and 890 cm-1 appear in the region of bending vibrations of О—H or of the bonds between О—H and atoms of Fe (Fe—OH bonds). The band at γ =630cm-1 has not been yet assigned but it may correspond to the stretching vibration stressing the Fe(III)—О bond . The absorption peaks centered at 1381 and 1378 cm-1 are attributed to the C–N stretching vibrations of PVP. The peaks observed at 1644 and 1639 cm-1 correspond to the C=O group. The results suggest that the oxygen from the carbon group and the iron ion undergo chemical interaction.