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. 2021 Jan 6;37(2):666–674. doi: 10.1021/acs.langmuir.0c02592

Figure 5.

Figure 5

Chemometric analysis of FTIR spectra of AcidBir (orange) and δ-MnO2 (blue) from the adsorption (Figure 4a,b,d,e) and desorption (not shown) legs. The analysis decomposed the spectra into spectral components (a,b) and relative concentration profiles (c,d). Concentration profiles show both adsorption (filled) and desorption (open) legs.