Chen Yilan, Zhong Chaoteng, Wu Junjie, Ma Jianfei, Yu Xiaojing, Liu Yamin
School of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou350118, FujianChina.
Fuzhou Smart Environmental Industry Technology Innovation Center, Fuzhou350118, FujianChina.
Langmuir. 2022 Nov 22;38(46):14192-14199. doi: 10.1021/acs.langmuir.2c02205. Epub 2022 Nov 10.
In this study, a one-step method of polyethylenimine (PEI) cross-linking graphene oxide (GO) was used to prepare a 3D pore-structured adsorbent with abundant amine groups for chemisorption of CO. The cross-linking of PEI with GO sheets and the vacuum freeze-drying step are the keys to the formation of the 3D pore structure. The results of characterization analysis revealed that the as-prepared adsorbent had a 3D porous structure rich in amine groups. Besides, the adsorption/desorption test showed that the prepared adsorbent has excellent and stable adsorption performance, and the maximum CO adsorption capacity is 2.18 mmol/g at 343 K and 10 vol % CO. Moreover, the adsorption kinetics analysis indicated that the adsorption process was dominated by homogeneous adsorption, and the adsorbent had a strong affinity with CO. Finally, the correlation analysis shows that the kinetic constants obtained by the Avrami model simulation can be effectively used for the actual CO adsorption process design.
在本研究中，采用聚乙烯亚胺（PEI）交联氧化石墨烯（GO）的一步法制备了一种具有丰富胺基的三维孔结构吸附剂，用于化学吸附CO。PEI与GO片层的交联以及真空冷冻干燥步骤是形成三维孔结构的关键。表征分析结果表明，所制备的吸附剂具有富含胺基的三维多孔结构。此外，吸附/解吸试验表明，所制备的吸附剂具有优异且稳定的吸附性能，在343 K和10 vol% CO条件下，最大CO吸附容量为2.18 mmol/g。而且，吸附动力学分析表明，吸附过程以均相吸附为主，吸附剂与CO具有很强的亲和力。最后，相关性分析表明，通过Avrami模型模拟得到的动力学常数可有效用于实际CO吸附过程设计。
