Graphene Oxide/Polyvinyl Alcohol/Fe₃O₄ Nanocomposite: An Efficient Adsorbent for Co(II) Ion Removal

Figure 2

Optimization conditions for adsorption Co²⁺ ion onto GO/PVA/Fe₃O₄ nanocomposite: (a) effect of contact time, (b) effect of the adsorbent dosage: (A) 0.03 g; (B) 0.02 g; (C) 0.01 g, respectively, (c) effect of temperature, and (d) effect of pH: (A) pH 2 and (B) pH 5.2 (inserted image: % removal of samples vs. pH).

(a)

(b)

(c)

(d)