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. 2015 Dec 9;5:17538. doi: 10.1038/srep17538

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NH₃-TPD curves of magnetic carbonaceous acid: (a) before sulfonation (C/Fe₃O₄, acidity of 0.17 mmol g⁻¹) and (b) after sulfonation (C-SO₃H/Fe₃O₄, acidity of 0.96 mmol g⁻¹) (background without NH₃).