Abstract: Carbonaceous aerosols, issued from the incomplete combustion of fossil and biomass fuels (black carbon as well as organic carbon), are now recognized for their potential impact on the radiative budget of the atmosphere and thus on climate. Unlike the other components of atmospheric aerosols, black carbon aerosols have a large optical absorption coefficient. The halogenated compounds are thought to be very important in atmospheric chemistry, and the significance of the iodine chemistry in the atmosphere has been demonstrated by recent observations. However, there are very a few studies on the interactions between black carbon aerosols and halogenated compounds. The uptake of isopropyl iodine (one significant source of iodine to the atmosphere) on black carbon surface was investigated at 298 K for the first time. Degussa FW2 (an amorphous black carbon comprising medium oxides) was used as black carbon sample. Black carbon surface was found to be deactivated in reaction with i-C3H7I, and the uptake coefficient (γ) was dependent on the time of exposure. The value of (9.5±3.8)×10-2 was determined for the initial uptake coefficient (γ0). The experimental data from the present study allow for a rough estimation of the potential importance of the direct iC3H7I loss on black carbon under real atmospheric conditions. And the heterogeneous loss of i-C3H7I on carbonaceous aerosols may influence the concentration of i-C3H7I in the atmosphere and the interaction between i-C3H7I and carbonaceous aerosols may play a considerable role in the atmospheric chemistry. The result may be crucial to understand how carbonaceous aerosols interact with the alkyl iodine and influence the atmospheric radiative balance, heterogeneous chemistry and the cloud condensation nuclei (CCN)-forming potential, and suggests that the heterogeneous loss of i-C3H7I on carbonaceous aerosols may be important under the atmospheric conditions. 