Amino-functionalized hypercross-linked polymers in highly selective anionic dye removal and CO2/N2 separation
Recently, the fabrication of adsorbents has achieved great improvement. However, the design of adsorbents with high adsorption amount and superior selectivity still remains a big challenge. In the present work, novel cost effective NH2-HCPs adsorbent toward toxic dyes and CO2/N2 separation is facilely synthesized through one-step Friedel–Crafts alkylation reaction of m-phenylenediamine (MPD). The adsorption processes under different adsorption parameters with respect to contact time and initial dye concentration were investigated in detail to explore the adsorption characteristics of NH2-HCPs. Moreover, the experimental results also demonstrated that the equilibrium adsorption isotherm and adsorption kinetics for the adsorption of anionic dye onto NH2-HCPs fitted well with the Langmuir model and pseudo-second-order model, respectively. With mesoporous structure and large density of active amino groups, the amino-functionalized hypercross-linked polymers (NH2-HCPs) not only showed unprecedented adsorption amounts for anionic dye X-3B of 3290 mg g-1 with almost no adsorption toward cationic dye, but also possessed excellent CO2/N2 selectivity of 122.