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U ovome radu napravljena je karakterizacija četiri ultrafiltracijske (UF) membrane (GH, GK, PT i PU) granične molekulske mase (eng. Molecular weight cut-off, MWCO) 2, 3, 5 i 10 kDa prije i nakon obrade tekstilnom otpadnom vodom (TOV). Određeni su zeta potencijali, hidrofobnost/hidrofilnost, hrapavost površine, spektri valnih duljina infracrvenim spektrofotometrom s Fourierovom transformacijom (FTIR) i površinski morfološki prikazi pomoću mikroskopije atomskim sila (AFM). Dobivenim mjerenjima utvrđene su promjene na membranama nakon obrade TOV-e. Nakon obrade TOV-e kod UF membrana, posebice GK, PT i PU, došlo je do smanjenja zeta potencijala zbog pojačanih elektrostatskih interakcija dok je kod GH membrane uočeno povećanje zeta potencijala. Također je pokazano AFM-om da su sve ispitivane membrane homogene. Na svim membranama nakon obrade TOV-e pokazuje se povećanje hrapavosti površine. FTIR spektrima utvrdilo se stvaranje novih pikova na svim membranama što potvrđuje adsorpciju otopljenih tvari na površini membrana. Kontaktni kutovi novih nekorištenih membrana pokazali su hidrofilnost površine. Nakon obrade TOV-e, membrane pokazuju povećanje kontaktnog kuta, a samim time i blago povećanu hidrofobnost površina. In this research, the characterization of four ultrafiltration (UF) membranes (GH, GK, PT, PU) with molecular weight cut-off (MWCO) values 2, 3, 5, and 10 kDa were investigated before and after treatment with textile wastewater (TWW). Zeta potential, hydrophobicity/hydrophilicity, surface roughness, wavelength spectra by Fourier transform infrared spectrophotometer (FTIR), and surface morphology images by atomic force microscopy (AFM) were determined. The obtained measurements determined the changes in the membranes after TWW treatment. After the treatment of TWW with UF membranes, especially GK, PT, and PU, there was a decrease in the zeta potential due to enhanced electrostatic interactions, while an increase in the zeta potential was observed with the GH membrane. It was also shown by AFM that all investigated membranes are homogeneous. All membranes show an increase in surface roughness after TWW treatment. FTIR spectra revealed the formation of new peaks on all membranes, which confirms the adsorption of dissolved solutes on the surface of the membranes. The contact angles of the new unused membranes showed the hydrophilicity of the surface. After TWW treatment, the membranes show an increase in the contact angle, and thus a slightly increased hydrophobicity of the surfaces.