Facile Synthesis of Graphene Oxide/Titanate Nanotube Composites and Their Application for Cobalt(II) Removal

Figure 6

Effect of NaOH concentration on the morphology of the samples. (a) 0 M. (b) 0.1 M. (c) 1 M. (d) 4 M.

(a)

(b)

(c)

(d)