PCFM Lab, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P.R. China.
College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, P.R. China.
Sci Rep. 2017 Jun 20;7(1):3913. doi: 10.1038/s41598-017-04329-w.
A fibrous adsorbent with amino-terminated hyperbranch structure (PP-AM-HBP-NH) was prepared by grafting hyperbranched polyamine (HBP-NH) onto the acrylamide-modified polypropylene (PP) fibers. The grafting of AM on PP fibers provided the active sites for introducing HBP-NH onto the PP fibers. This kind of "grafting to" procedure to synthesize hyperbranch-structured fiber could overcome the disadvantages of stepwise growth procedure, avoiding the complicated synthesis process and the requirement of strict experimental conditions. The grafted HBP-NH was three-dimensional dentritic architecture and had a large number of pores existing within the grafted polymers, which is favorable for CO molecules to diffuse into the HBP-NH. Therefore, the as-prepared PP-AM-HBP-NH fibers showed a high adsorption capacity (5.64 mmol/g) for CO in the presence of water at 25 °C, and the utilization efficiency of alkyl amino groups could reach 88.2%, demonstrating that the hyperbranched structure of adsorbents can greatly promote adsorption capacity and efficiency. This could be attributed to better swelling properties and lower mass transfer resistance to CO of the hyperbranched adsorbent. PP-AM-HBP-NH also showed excellent regeneration performance, and it could maintain the same adsorption capacity for CO after 15 recycle numbers as the fresh adsorbent.
一种具有端氨基超支化结构的纤维状吸附剂（PP-AM-HBP-NH）是通过将超支化多胺（HBP-NH）接枝到丙烯酰胺改性的聚丙烯（PP）纤维上制备的。AM 在 PP 纤维上的接枝为将 HBP-NH 引入 PP 纤维上提供了活性位点。这种“接枝到”方法合成超支化结构纤维可以克服逐步生长方法的缺点，避免复杂的合成过程和严格的实验条件要求。接枝的 HBP-NH 具有三维树突状结构，并且在接枝聚合物中存在大量的孔，这有利于 CO 分子扩散到 HBP-NH 中。因此，在 25°C 下存在水的情况下，所制备的 PP-AM-HBP-NH 纤维对 CO 表现出高吸附容量（5.64mmol/g），烷基氨基基团的利用率可达到 88.2%，表明吸附剂的超支化结构可以极大地提高吸附容量和效率。这可归因于超支化吸附剂具有更好的溶胀性能和更低的 CO 传质阻力。PP-AM-HBP-NH 还表现出优异的再生性能，在 15 次循环后，其对 CO 的吸附容量与新鲜吸附剂相同。
