A comparative study of the adsorption properties of 1-naphthylamine by XAD-4 and NDA-150 polymer resins

A hydrophilic polymer resin (NDA-150) was synthesized, and the adsorption performance of 1-naphthylamine on NDA-150 was compared with that on the commercial hydrophobic resin (XAD-4). The kinetic adsorption of 1-naphthylamine onto the two resins is limited by the successive steps of film diffusion and intraparticle diffusion, and obeys the pseudo-second-order rate model. But the adsorption rate on XAD-4 is greater than NDA-150. All the associated adsorption isotherms can be well represented by Langmuir equation, and the larger uptake and stronger affinity of NDA-150 than XAD-4 probably results from the abundant microporous structure and polar groups of NDA-150. It is obviously observed that hydrophobic XAD-4 spontaneously adsorbs 1-naphthylamine driven mainly by enthalpy change, while hydrophilic NDA-150 does driven mainly by both entropy change and enthalpy change. Dynamic breakthrough and the total adsorption capacity of NDA-150 at 293 K are 1.49 and 1.82 mmol mL−1 resin, respectively. More than 99.5% regeneration efficiency for the resin was achieved by ethanol at 313 K.