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. 2015 Jul 29;5:12638. doi: 10.1038/srep12638

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(a) SEM image of acid-treated biochar (control), (b) SEM image of Fe₃O₄ coated biochar, (c) TEM image of acid-treated biochar, (d) TEM image of Fe₃O₄ coated biochar. Phases of ATB and MBC highlighted in small boxes are magnified 1000 times in big boxes.