Figure 5. Effect of contact time on Cu(II) adsorption rate onto oMWCNTs and test of pseudo-second-order adsorption kinetics plot for Cu(II), m/V = 0.5 g/L, T = 25±1°C, C[Cu2+]initial = 1.87×10−4 mol/L, I = 0.01 mol/L NaCl, pH = 4.00±0.05.
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