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a–b, Hg(II) adsorption kinetics (a) and fitting by pseudo-first- and second- order kinetic models (b). c–d, Hg(II) adsorption isotherms fitted by Langmuir (c) and Freundlich (d) adsorption models. e, Hg(II) adsorption in solutions with different pH values. f, Hg(II) adsorption in solutions containing a mixture of metal ions.
