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One-step synthesis of N-containing hyper-cross-linked polymers by two crosslinking strategies and their CO2 adsorption and iodine vapor capture
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2021-01-20 , DOI: 10.1016/j.seppur.2021.118352
Lishu Shao , Yafei Sang , Na Liu , Quan Wei , Feng Wang , Peng Zhan , Weihua Luo , Jianhan Huang , Jienan Chen

Here, a series of N-containing hyper-cross-linked polymers (HCPs) were synthesized from triphenylamine (TPA) or/and carbazole (Cz) monomers by one-step crosslinking reactions including Scholl coupling and solvent knitting Friedel-Crafts. Especially, the two reactions were also performed separately under adding both of TPA and Cz, and prepared HCP3 and HCP6. Notably, HCP1, HCP2, HCP3 prepared by Scholl coupling possessed better porosity with the Brunauer-Emmett-Teller (BET) surface areas (SBET) of 199.9–534.5 m2/g and micropore volume (Vmicro) of 0.088–0.24 cm3/g, while HCP4, HCP5, and HCP6 synthesized by solvent knitting Friedel-Crafts had inferior SBET (10.8–34.8 m2/g) with meso/macroporous structure. In addition, these HCPs displayed high N contents, various morphologies, and different hydrophobicity. Interestingly, HCP1 ~ HCP3 exhibited high CO2 uptake (104.7–116.3 mg/g) and acceptable CO2/N2 selectivity at 273 K and 1.0 bar, and large isosteric heat of adsorption (Qst) (28.0–46.7 kJ/mol), while the HCP4 ~ HCP6 showed the larger I2 vapor uptake (254.2–324.8 wt%) at 351 K and 1.0 bar than HCP1 ~ HCP3 (136.5–185.6 wt%). The results indicated the porosity especially microporosity played an important role on CO2 capture, while the SBET was not always the dominated factors for I2 vapor adsorption due to the predominant chemical interaction by electrons transfer, and the chemical structure of polymer skeletons should make the large contribution. This work will develop multifunctional polymers prepared by the facile synthetic method, and make a promising adsorbents for CO2 and iodine capture.



中文翻译:

两种交联策略一步合成含氮超交联聚合物及其CO 2吸附和碘蒸气捕集

在此,通过三步胺交联反应(包括Scholl偶联和溶剂编织Friedel-Crafts),由三苯胺(TPA)或/和咔唑(Cz)单体合成了一系列含N的超交联聚合物(HCP)。特别地,在添加TPA和Cz的同时,还分别进行了两个反应,并制备了HCP3和HCP6。值得注意的是,通过Scholl偶联制备的HCP1,HCP2,HCP3具有更好的孔隙率,布鲁诺尔-埃米特-泰勒(BET)表面积(S BET)为199.9-534.5 m 2 / g,微孔体积(V micro)为0.088-0.24 cm 3 / g,而溶剂编织Friedel-Crafts合成的HCP4,HCP5和HCP6的S BET较差(10.8–34.8 m2 / g),具有介观/宏观结构。此外,这些HCP表现出较高的N含量,各种形态和不同的疏水性。有趣的是,HCP1〜HCP3在273 K和1.0 bar下表现出高的CO 2吸收(104.7–116.3 mg / g)和可接受的CO 2 / N 2选择性,以及大的等规吸附热(Q st)(28.0–46.7 kJ / mol) ),而HCP4〜HCP6在351 K和1.0 bar下显示的I 2蒸气吸收量(254.2–324.8 wt%)比HCP1〜HCP3(136.5–185.6 wt%)更大。结果表明,孔隙率(尤其是微孔率)在CO 2捕获中起着重要作用,而S BET并不总是I 2的主导因素。2蒸气吸附是由于电子传递的主要化学相互作用,而聚合物骨架的化学结构应起很大作用。这项工作将开发通过简便的合成方法制备的多功能聚合物,并为CO 2和碘的捕获提供有希望的吸附剂。

更新日期:2021-01-24
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