Construction of Cu-N coordination into natural biopolymer lignin backbone for highly efficient and selective removal of cationic dyes

[Display omitted] •Robust & eco-friendly adsorbent Cu2+-doped aminated-lignin (Cu-AL) was fabricated.•The Cu-AL had high adsorption capacities of azure B (AB) and saffron T (ST).•The Cu-AL maintained high removal efficiency (>80%) of dyes after 4 reuses.•The Cu-AL could remove and separate AB...

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