Lignin derived absorbent for efficient and sustainable CO_(2) capture  

作　　者：Yuandong Cui Bin He Yu Lei Yu Liang Wanting Zhao Jian Sun Xiaomin Liu 

机构地区：[1]School of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266071,China [2]School of Life Science,Beijing Institute of Technology,Beijing 100081,China [3]Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering,Ministry of Industry and Information Technology,Beijing Engineering Research Center of Cellulose and Its Derivatives,Advanced Research Institute of Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第2期89-97,共9页中国化学工程学报（英文版）

基　　金：supported by National Natural Science Foundation of China (22078023, 22178187);Natural Science Foundation of Shandong Province (ZR202102180830);Taishan Scholars Program of Shandong Province (tsqn201909091);the Startup Foundation of China (3160011181808)。

摘　　要：High and cost-efficient capture of CO_(2) is a prerequisite and an inevitable path of carbon emission reduction. To address the challenges(high cost, low efficiency, less sustainability, etc.) of existing petroleum-based CO_(2) absorbents, herein, a class of efficient and sustainable lignin-based absorbents were resoundingly prepared by grafting the active amine group on a lignin derived compound vanillin and alkali lignin. The results demonstrated that vanillin modified by acrylamide achieved the excellent absorption capacity among the three absorbents, whose ability was 0.114 g CO_(2) per gram of absorbent under 25 ℃ and 100 kPa. In addition, the absorbent retained stable absorbability of CO_(2) after 6 cycles.The absorbing capacity of the absorbent formed by the coupling of vanillin and acrylamide to CO_(2) was much greater than their own(i.e. 0 g CO_(2) ·g^(-1)vanillin, 0.01 g CO_(2) ·g^(-1) acrylamide, respectively).Detailed information revealed the multi-site synergistic absorption mechanism, in which CO_(2) has C and O double interactions with the amide group of the absorbent, and single interaction with the hydroxyl oxygen on the benzene ring of the absorbent. The absorption capacity of modified lignin for CO_(2) is as high as 0.12 g CO_(2) per gram of absorbent, which is comparable with that of model compound vanillin.This work not only provides a new idea for the design of bio-absorbents for CO_(2) capture, but explores the application potential of lignin-based materials.

关 键 词：Lignin(model compound) CO_(2)absorption Amide group MULTI-SITE ACID-BASE Hydrogen bonding 

分 类 号：X701[环境科学与工程—环境工程] TQ028.17[化学工程]