Plotting ln (qe-qt) vs.tfor Plotting ln (qe qt) vs.tfor the adsorption of NA by HSANGs from a solution at different NA concentrations did not converge well, and they did not provide straight lines, indicating that the Lagergren pseudo-first-order equation is not relevant for descripting the adsorption of NA by HSANGs; as it is shown in Fig. 8.