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(a) The effect of the initial pH value on adsorption capacities of AS for methylene blue (MB) removal and the pH dependence of Zeta potential variation of MB adsorbed onto AS; (b) the removal ratio of AS for MB at different initial MB concentrations; (c) the adsorption isotherm of AS for MB removal; (d) the fitting adsorption data for the Langmuir and the Freundlich isotherm models.
