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. 2013 Aug 29;8(8):e72475. doi: 10.1371/journal.pone.0072475

Figure 6. Adsorption of Cu(II) on oMWCNTs as a function of pH, m/V  = 0.5 g/L, T = 25±1°C, C[Cu2+]initial  = 1.87×10−4 mol/L.

Figure 6

Solid points: adsorption vs. initial pH values; open points: equilibrium pH values vs. initial pH values.