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This article introduces research on the synthesis and characteristics of C–TiO2 doped cellulose acetate (CA) nanocomposite film. TiO2 nanoparticles were synthesized from Ilmenite mineral in Binh Dinh, Vietnam, and modified by Stevia Rebaudiana plant in order to serve as a cheap, stable, and eco-friendly photocatalyst that could perform under visible light. Nanocomposite film was obtained by dispersing C–TiO2 on cellulose acetate polymer using a supersonic generator. The prepared material was characterized by X-ray diffractions (XRD), N2 adsorption, Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray analysis (EDX), UV–Vis diffuse reflectance spectroscopy (UV–vis DRS), photoluminescence (PL) emission spectra, scanning electron spectroscopy (SEM), and thermogravimetric/differential thermal analysis (TG-DTA). The film's photocatalytic efficiency was evaluated via the decomposition of Reactive Red-195 (RR-195) under visible irradiation at room temperature. The results showed that the maximum conversion of RR-195 reached 99.15% at pH = 3 and the activity of the catalyst had a slight decrease after up to four times of recycling, for which the conversion of the fourth reaction was 90.02% for RR-195. This result suggests an efficient treatment method to eliminate organic pollutants from wastewater and stimulate these industrial activities in Vietnam. [ABSTRACT FROM AUTHOR]