When wood burns, it produces carbon, which makes the wood turn. While you can easily sand out the burnt 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 odours 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 odour neutraliser and making the baking soda damp will enhance its ability to remove odours.
Let the baking soda sit on the wood for several hours.
Sweep off the baking soda and throw it away.