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. 2017 May 23;8:823. doi: 10.3389/fmicb.2017.00823

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Copyright © 2017 He, Zhong, Duan, Feng, Yang and Yang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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TEM micrographs of (a) Fe₃O₄ nanoparticles (NPs), (b) biochar, and (c) Fe₃O₄/biochar, SEM images of (d) biochar, (e) Fe₃O₄/biochar, and (f) magnified SEM image of Fe₃O₄/biochar.