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. Author manuscript; available in PMC: 2019 Mar 6.
Published in final edited form as: Environ Sci Technol. 2018 Apr 16;52(9):5027–5047. doi: 10.1021/acs.est.7b06487

Figure 4.

Figure 4.

Knowledge evolution concerning the phases, surface chemistry, and molecular structure of biochars as a function of the inverse biochar scale (size) and research time. Inner figures were cited from refs 1, 21, 22, 40, 119. Copyright 2010, 2016, 2017 American Chemical Society.