Fig. 5. The filtration of dyes using polyHIPE(NH2)/GO and polyHIPEs/GO columns. (a) UV-Vis spectra of the dye solution at different adsorption processes. Spectra 1–4 correspond to the original mixed dye solutions (50 mL × 10 μg mL−1 of MB, RB, and EY), solution passed through polyHIPE(NH2)/GO column at pH 3.0, solution passed through polyHIPEs/GO column at pH 4.0, solution passed through polyHIPEs/GO column at pH 7.0, spectra 5 and 6 are solo EY and RB, respectively. (b) Adsorption percentages of EY, RB and MB in processes I–III illustrated in Fig. 1. The GO content in polyHIPEs/GO and polyHIPEs(NH2)/GO is 1.35 wt%.
