<p>Biochar prepared from breadfruit seed hull (BFSHBC) was employed as an adsorbent material to remove ciprofloxacin and tartrazine dye from an aqueous solution. The adsorbent was characterized using BET, SEM, XRD, TGA, pH_pzc, and FT-IR to ascertain the functional groups on the adsorbent responsible for the binding of the pollutants. The thermogravimetric analysis indicated a high stability of BFSHBC up to 400&#xa0;°C. The prepared BFSHBC viewed under scanning electron microscopy revealed a structure with many pores. A pH_pzc of 6.4 was recorded for the prepared carbon-based adsorbent material. We found that the optimum pH for the uptake of ciprofloxacin (CPX) and tartrazine (TZ) was 6.0 and 2.0, respectively. The results of the batch adsorption studies were analysed using different kinetic models, such as film diffusion (FMD), intraparticle diffusion (ITD), pseudo-first-order (PSFO), and pseudo-second-order (PSSO). The R² values of 0.99775 and 0.99876 for CPX and TZ indicated that PSSO and FMD were more suitable for analyzing the experimental data. The Langmuir model provides the best fit among various equilibrium isotherms, including the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models. This is evidenced by its higher coefficients of determination (R²) of 0.99759 and 0.99198, along with comparatively smaller sums of squared errors of 0.00615 and 0.0065 for CPX and TZ, respectively, when compared to the other models, suggesting a homogeneous surface of the adsorbent for monolayer adsorption. The maximum adsorption capacity according to the Langmuir isotherm model is 0.115 and 0.169 for CPX and TZ, respectively. The thermodynamic result showed that the adsorption processes were random, feasible, spontaneous, and endothermic on the prepared biochar. The adsorption efficiencies of CPX and TZ indicated no significant reduction after regeneration, demonstrating the suitability of the adsorbent for practical applications.</p>