The uptake of ethyl iodide on black carbon surface

The importance of the iodine chemistry in the atmosphere has been demonstrated by recent observations. The uptake of ethyl iodine 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 C₂H₅I, and the uptake coefficient (γ) was dependent on the time of exposure. The value of (2.3±0.9)×10⁻² was determined for the initial uptake coefficient (γ ₀). The result suggests that the heterogeneous loss of C₂H₅I on carbonaceous aerosols may be important under the atmospheric conditions. Supported by 973 Program of Ministry of Science and Technology of China (Grant No. 2006CB403701), Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-YW-205) and Hundred Talents Fund, and the National Natural Science Foundation of China (Grant Nos. 20577052, 20673123, 20473094 and 20503035)