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. 2022 Mar 5;439:135613. doi: 10.1016/j.cej.2022.135613

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Fig. 5 — Influence of solution pH on the adsorption of metal ions (Pb(Ⅱ), Cd(Ⅱ), and Sr(Ⅱ)) onto pristine (a) and aged (b) DFMs; Net surface charge of pristine and aged DFMs as a function of initial solution pH (c).