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. 2020 Mar 31;8:196. doi: 10.3389/fchem.2020.00196

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Copyright © 2020 Zhang, Wang, Shen, Duan and Zhang.

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) and the copyright owner(s) 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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(A) Adsorption rates of MB on various porous carbons derived from [FA][X] (80 mg L⁻¹, 20 mL, 10 mg carbon). (B) UV–vis absorption spectra and corresponding photograph (inset) of the MB aqueous solutions in the presence of [FA][H₂PO₄]-derived carbon at different intervals. (C,D) Adsorption isotherms of MB and RhB on [FA][H₂PO₄]-derived porous carbon, respectively. The insets show the molecular structures of MB and RhB, respectively.