Effective and Simple NaOH-Modification Method to Remove Methyl Violet Dye via Ipomoea aquatica Roots

Figure 9

FT-IR spectra to compare (a) KR (blue) vs. NaOH-KR (Purple) and (b) NaOH-KR before (yellow) and after MV adsorption (blue).

(a)

(b)