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Caption : fig. s1 eds mapping images of the adsorbent.

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Caption : fig. s2 n2 adsorption–desorption isotherms of tpei (inset: the corresponding pore size distribution curves).

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Caption : fig. s3 adsorption isotherms of pb(ⅱ) and cr(ⅵ) at different temperatures.

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Caption : fig. s4 influence of competitive ions on pb(ⅱ) (a) and cr(ⅵ) (b) adsorption.

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Caption : fig. s5 the reusability of tpei for removal of pb(ii) (a) and cr(vi) (b).