Figure 1. Honey comb like structure of biochar (Retrieved from www.biochar-international.org)

From

Review of Eco-Friendly Biochar Used in the Removal of Trace Metals on Aqueous Phases

A. B. Duwiejuah, S. J. Cobbina, N. Bakobie

International Journal of Environmental Bioremediation & Biodegradation. 2017, 5(2), 27-40 doi:10.12691/ijebb-5-2-1