Indigo Carmine and 2,6-Dichlorophenolindophenol Removal Using Cetyltrimethylammonium Bromide-Modified Palm Oil Fiber: Adsorption Isotherms and Mass Transfer Kinetics

Figure 3

SEM images of (a, b) raw POF, (c, d) NaOH-treated POF, and (e, f) CTAB-modified POF.

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(b)

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(f)