Surface and colloid properties of biochar and implications for transport in porous media

Biochar contains a large amount of colloidal particles. Biochar colloids are generated (1) during pyrolysis of the feedstock, where some of the biochar formed is in the colloidal size fraction, and (2) by the breakdown of larger biochar particles. Here, we review the surface and colloid properties of biochar and the implications for transport of biochar colloids in porous media. We discuss the origin of biochar colloids and their physical and...