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Pre-adsorption and post-adsorption of Hg(II) (a, c) and DCF (b, d) on COF-S-SH and COF-OH-SH. For the mixed solute-Hg(II) with pre-adsorption, Hg(II) was adsorbed first for 30 min before DCF. For the mixed solute-Hg(II) with post-adsorption, DCF was adsorbed first for 30 min before Hg(II).
