摘要
通过粒径调控策略制备了基于不同粒径ZIF-8的多孔液体(PLs),并用于CO_(2)的捕集。考察了ZIF-8粒径对多孔液体捕集CO_(2)的吸附容量、吸附速率、CO_(2)/N_(2)选择性及循环稳定性的影响,并对不同粒径多孔液体的CO_(2)吸附动力学进行研究。结果表明,多孔液体中具有永久的孔隙结构,不同多孔液体均具有优异的流动性。3种不同粒径的多孔液体室温下放置60 d或4500 r/min下离心5 min后均未出现聚集、沉积现象,表明不同粒径多孔液体均具有较好的稳定性。由不同粒径ZIF-8合成的多孔液体对CO_(2)的吸附过程包括物理吸附和化学吸附。其中,ZIF-8粒径为43 nm的多孔液体ZIF-8-PLs(43)对CO_(2)的饱和吸附容量最大,为63.0 mg/g;ZIF-8-PLs(145)展现了较快的CO_(2)吸附速率,准二级动力学常数为1.91×10^(-3)g/(mg·min);ZIF-8-PLs(1400)具有最高的CO_(2)/N_(2)选择性,是ZIF-8-PLs(43)的4.7倍;3种多孔液体经过4次再生后均具有较好的循环稳定性。
Porous liquids(PLs)based on ZIF-8 with different particle sizes for CO_(2)capture were prepared through particle size control strategy.The effects of ZIF-8 particle sizes on the CO_(2)adsorption capacity,adsorption rate,CO_(2)/N_(2)selectivity and cycling stability of PLs were then investigated,followed by analysis on their CO_(2)adsorption kinetics.The results showed that all the PLs obtained had permanent pore structure and excellent fluidity.Three porous liquids with different particle sizes showed no aggregation and deposition after being placed at room temperature for 60 d or centrifuged at 4500 r/min for 5 min,indicating excellent stability of these three PLs.Meanwhile,the CO_(2)adsorption process involved both physical and chemical adsorptions.ZIF-8-PLs(43)with ZIF-8 particle size of 43 nm demonstrated the largest saturation adsorption capacity of 63.0 mg/g for CO_(2),while ZIF-8-PLs(145)exhibited a faster CO_(2)adsorption rate with a pseudo-second order kinetic constant of 1.91×10^(-3)g/(mg·min),and ZIF-8-PLs(1400)showed the highest CO_(2)/N_(2)selectivity,which was 4.7 times as much as that of ZIF-8-PLs(43).All three PLs remained stable after being recycled 4 times.
作者
王焕君
靳归
李野
张珂新
张庆文
邢侠
王娟
郭东方
WANG Huanjun;JIN Gui;LI Ye;ZHANG Kexin;ZHANG Qingwen;XING Xia;WANG Juan;GUO Dongfang(National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage,Beijing 102209,China;Beijing Key Laboratory of CO2 Capture and Treatment(China Huaneng Group Clean Energy Technology Research Institute Co.,Ltd.),Beijing 102209,China;Shaanxi Key Laboratory of Nanomaterials and Nanotechnology,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China;Huaneng Shanghai Shidongkou Power Generation Co.,Ltd.,Shanghai 200942,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2023年第3期572-583,共12页
Fine Chemicals
基金
中国华能集团清洁能源技术研究院有限公司院基金项目(TY-21-CERI03)
中国华能集团科技项目(HNKJ20-H58,HNKJ21-H18,HNKJ21-H67)。
