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At low pH (pH = 2), the removal ability of the Pb ion was 63.5%, which may be due to the high concentration of H + ion in the medium, so the ion occupies the active sites ( + in the medium decreases, and the competition between H + and metal ions on the adsorber surface might be reduced, which significantly improves the efficiency of the adsorption method ( The percentage of Pb (II) adsorbed onto the present composite was also examined as a function of contact time (Figure 13B)

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Peel and press each patch firmly onto skin