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. 2020 Nov 11;6(11):e05388. doi: 10.1016/j.heliyon.2020.e05388

Figure 5.

Figure 5

ATR-FTIR normalized spectra of biochars before and after sorption of Cd(II), Pb(II) and Zn. A) biochar OSR700, B) OSR550, C) WSP550, D) SWP550, E) MSP550.