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. 2021 Jul 28;9:662482. doi: 10.3389/fchem.2021.662482

FIGURE 8.

FIGURE 8

FTIR spectra of Semi-IPN2 adsorbent after adsorption of Pb(II) at the pH values of (A) 3, (B) 3.5, (C) 4, (D) 4.5, and (E) 5.