When wood burns, it produces carbon, which makes the wood turn. While you can easily sand out the burned portions of the wood, it is harder to remove the smoke smell from burnt wood. One way to do this is to use baking soda. Baking soda is a natural disinfectant that also has the ability to absorb odors from deep inside the wood. This method is useful on finished wood, but it is most useful on unfinished wood that is porous.
Sprinkle baking soda on the burnt wood.
Mist white vinegar lightly over the baking soda so that the baking soda is damp but not soaking wet. The white vinegar will act as an odor neutralizer and making the baking soda damp will enhance its ability to remove odors.
Let the baking soda sit on the wood for several hours.
Sweep off the baking soda and throw it away.