6-Deoxy-6-(2-aminoethyl) amino chitosan (CS-AEA) and aminoethyl modified CS-AEA (CS-AEA-AEM) were synthesized and characterized using FTIR, NMR and elemental analysis. The results showed that the expected CS derivatives were obtained, and the amine group content increased successively in CS, CS-AEA and CS-AEA-AEM. The red blood cell (RBC) agglutination behaviors in solutions of CS and its derivatives were studied using optical microscopy (OM) and ultraviolet-visible (UV-Vis) spectrophotometry. The results demonstrated that the agglutination of RBCs became more evident upon decreasing the pH value and increasing the concentration. Although CS-AEA-AEM had the highest content of amine groups, CS-AEA exhibited the best agglutination performance under the pH and concentration range studied. Potentiometric titration and ionization degree calculations showed that the agglutination behavior of RBCs was determined by the number of protonated amines in CS or its derivatives. Hemocompatibility tests showed that the hemolysis of CS derivatives increased after modification, and the CS derivatives could be classified as a slightly hemolytic material. We have sucessfully developed a CS derivative (CS-AEA) with very good RBC agglutination performance under neutral conditions.
Adsorbent materials with high adsorption efficiency, good processing stability, and high adsorption rate, are crucial for carbon capture, utilization and storage (CCUS) technology. In this paper, a novel polyethyleneimine (PEI)-embedded porous adsorbent with high amine-content matrix was one-step prepared successfully by a unique high internal phase emulsion (HIPE) polymerization. Firstly, the amphiphilic polyethyleneimine-based carbon nanotubes (CNT-PEI) was synthesized and applied as a Pickering emulsifier, and the interfacial tension was analyzed by a multi-functional tensiometer. Secondly, a large amount of divinylbenzene (DVB) was introduced into the continuous phase of HIPE, and then some mesopores were generated in the framework of the macro-porous polymer, which indicated by specific surface and pore size analyzer and scanning electron microscope (SEM), respectively. Finally, the additional PEI was added into the dispersed phase of HIPE. In such unique HIPE template, PEI was penetrated into the framework and then the porous polymer with high amine-content matrix was achieved. The morphology, the surface element content and the CO 2 adsorption capacity of the obtained porous polymer were characterized by SEM, energy dispersive spectrometry (EDS), and the gas sorption analyzer. When the obtained porous polymer was applied as CO 2 adsorbent, the better comprehensive adsorption performance, including high CO 2 adsorption capacity of 2.87 mmol/g, fast adsorption kinetics, the isosteric heat of adsorption (Q st ) range of 65–68 kJ/mol, exceptional CO 2 /N 2 selectivity with a separation factor up to 118, and stable adsorption–desorption cycles, was exhibited. The superior CO 2 adsorption capacity and adsorption kinetics make it a promising candidate in practical CO 2 adsorption application.
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