Figure 3
From: Adsorption of phosphate on iron oxide doped halloysite nanotubes

(a) Electrophoretic mobility and (b) adsorption capacity values as a function of pH for raw HNT and 1Fe-HNT. Initial phosphate concentration 10 mg L−1, contact time 240 min, sorbent dosage 3 g L−1, and shaking speed 240 rpm.