Research Article

Sorption of Ammonium Ions onto Natural and Modified Egyptian Kaolinites: Kinetic and Equilibrium Studies

Figure 4

Influence of contact time on the sorption of onto all investigated sorbents (sorbent dose = 0.1 g; pH = 7; temperature = 30°C; contact time = 2 h).
935854.fig.004a
(a)
935854.fig.004b
(b)