<p>The textile industry continues to generate wastewater containing high levels of toxic dyes, posing serious environmental risks. In this work, eco-friendly cellulose/polyaniline/graphene oxide@TiO₂ nanoparticles adduct (GO@TiO₂-NPs) bio-nanocomposites sorbents were synthesized via in situ polymerization for the efficient removal of Acid Orange 7 (AO7) dye from aqueous solutions. The as-prepared sorbents were characterized by X-ray diffractometer, Fourier transform infrared spectroscopy, thermal analysis, and scan electron microscope. The results illustrated successful incorporation of polyaniline and GO@TiO₂-NPs into the cellulose matrix, to form bio-nanocomposites with improved crystallinity, surface morphology, and thermal stability. In addition, the adsorption performance was systematically investigated as a function of contact time, pH, sorbent dosage, and initial dye concentration. Notably, the sorbent with 10% GO@TiO₂-NPs achieved a remarkable 88.8% removal efficiency for AO7 dye, underscoring its potential as a highly effective adsorbent. The kinetic models reveal that intra-particle diffusion and surface adsorption are important adsorption processes. The maximal adsorption capacity of 60 mg/g is shown by the Langmuir model, which best fits the experimental results. These results suggest a physisorption-dominated mechanism, highlighting the potential of the bio-nanocomposite sorbent in mitigating water pollution. This research provides a promising outlook for the future of efficient wastewater treatment.</p>