Adsorption of methylene blue onto poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) nanotubes: Kinetics, isotherm and thermodynamics analysis

•Polyphosphazene nanotube as an adsorbent could be facilely synthesized.•The adsorbent owns numerous electron-rich N and P atoms and hydroxyl groups.•The adsorbent was an efficient and specific adsorbent for the removal of MB.•The pseudo-second-order model could be better to describe the adsorption...

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