Nitrogen-doped porous carbons from polyacrylonitrile fiber as effective CO_(2) adsorbents  

作　　者：Changdan Ma Jiali Bai Xin Hu Zhuohan Jiang Linlin Wang 

机构地区：[1]Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,Zhejiang Normal University,Jinhua 321004,China [2]Key Laboratory of Urban Rail Transit Intelligent Operation and Maintenance Technology and Equipment of Zhejiang Province,College of Engineering,Zhejiang Normal University,Jinhua 321004,China

出　　处：《Journal of Environmental Sciences》2023年第3期533-543,共11页环境科学学报（英文版）

基　　金：supported by Zhejiang Provincial Natural Science Foundation(No. LY21B070005);National Undergraduate Training Program for Innovation and Entrepreneurship of China(Nos. 202110345015 and 202110345016);Self designed scientific research project of Zhejiang Normal University(No. 2021ZS06)。

摘　　要：In this report, nitrogen-doped porous carbons were synthesized from polyacrylonitrile fiber by a facile two-step synthesis process i.e. carbonization followed by KOH activation. Activation temperature and KOH/carbon ratio are two parameters to tune the porosity and surface chemical properties of sorbents. The as-obtained sorbents were carefully characterized.Special attention was paid concerning the change of sorbents’ morphology with respect to synthesis conditions. Under the activation temperatures of this study, the sorbents can still retain their fibrous structure when the KOH/carbon mass ratio is 1. Further increasing the KOH amount will destroy the original morphology of polyacrylonitrile fiber. CO_(2)adsorption performance tests show that a sorbent retaining the fibrous shape possesses the highest CO_(2)uptake of 3.95 mmol/g at 25℃and 1 bar. Comprehensive investigation found that the mutual effect of narrow microporosity and doped N content govern the CO_(2)adsorption capacity of these adsorbents. Furthermore, these polyacrylonitrile fiber-derived carbons present multiple outstanding CO_(2)capture properties such as excellent recyclability, high CO_(2)/N_(2)selectivity, fast adsorption kinetics, suitable heat of adsorption, and good dynamic adsorption capacity. Hence, nitrogen-doped porous carbons with fibrous structure are promising in CO_(2)capture.

关 键 词：CO_(2)adsorption Nitrogen-doping porous carbon Fibrous morphology Polyacrylonitrile fiber KOH activation 

分 类 号：X701[环境科学与工程—环境工程] TQ424[化学工程]