Synthetic dyes such as methylene blue, which are cationic and one of the most important and toxic pollutants in water, are resistant to biodegradation. Adsorption is an effective method to remove these dyes from water. Silica aerogels have been considered as efficient adsorbents due to their specific surface area and high porosity. In this research, the adsorption of methylene blue from an aqueous solution of methylene blue in different concentrations from 5 to 150 mg/L and at two temperatures of 25 and 40 °C and using different amounts of silica aerogel as adsorbent has been studied. Within the studied conditions, the highest adsorption capacity of methylene blue on silica aerogel was 42 mg/g, and in different tests, the removal percentage of methylene blue was 38-97%. The kinetics and capacity of adsorption of methylene blue-silica aerogel system were studied. Adsorption kinetics were evaluated through two pseudo-first-order and second-order kinetics models. Based on the correlations and the regression, it was observed that the experimental data are more consistent with the first-order kinetics model. Also, the corelation between the experimental data and the equation of Langmuir and Freundlich isotherms was investigated. The results showed that there is a better agreement between the experimental data and the Langmuir isotherm.