Effect of Aging on the Adsorption of Tetracycline by Humic Acid: Insight into the Morphology and Chemical Composition

Figure 6

(a) XPS full scan spectra of HA and AHA samples; high resolution C1s XPS spectra of (b) HA (c) AHA-0.05, and (d) AHA-0.1; (e) the percentage of different functional groups carried by HA, AHA-0.05 and AHA-0.1.

(a)

(b)

(c)

(d)

(e)