氨基功能化双金属ZIF的合成及其CO2吸附性能研究
Synthesis and CO2 adsorption properties of amino-functionalized bimetallic ZIF
王明媚 1董季玲 2钟晨晨 1蒋伟 1刘洋1
作者信息
- 1. 重庆科技大学化学化工学院,重庆 401331
- 2. 重庆科技大学化学化工学院,重庆 401331;重庆科技大学冶金与动力工程学院,重庆 401331
- 折叠
摘要
沸石咪唑酯骨架材料(ZIFs)作为一种具有高比表面积、高孔隙率、高稳定性的新型多孔材料在CO2吸附分离领域有巨大的应用前景.为进一步提升ZIFs的CO2吸附性能,同时采用合成前和合成后功能化策略,在室温下一锅合成空心双金属Co/Zn-ZIF,随后将四乙烯五胺(TEPA)作为合成后功能化改性剂,使用浸渍法得到TEPA@Co/Zn-ZIF,并将其应用于CO2吸附和循环实验.通过XRD、FT-IR、SEM等测试手段对比分析了 TEPA@Co/Zn-ZIF与ZIF-8、Co/Zn-ZIF的差异.CO2吸附实验结果表明,改性后材料的CO2吸附容量提高至2.53 mmol/g(比ZIF-8和Co/Zn-ZIFs分别高出60％和33％),其归因于掺杂金属使活性金属中心与CO2产生更强的静电作用,以及-NH2与CO2的酸碱反应产生化学吸附.改性后材料循环5次仍表现出较好吸附效果(1.99 mmol/g).
Abstract
Zeolitic imidazolate framework materials(ZIFs)have demonstrated considerable promise in the field of CO2 adsorption and separation as a highly porous class of materials characterized by their high specific surface area,porosity and stable pore structure.In order to improve the CO2 adsorption capabilities of ZIFs,a dual ap-proach involving pre-synthetic and post-synthetic functionalization was implemented.A one-pot synthesis meth-od at ambient temperature was utilized to produce hollow bimetallic zeolitic imidazolate framework materials(Co/Zn-ZIF).Following this,tetraethylenepentamine(TEPA)was employed as a post-synthetic functionaliza-tion modifier through impregnation to synthesize TEPA@Co/Zn-ZIF,which was utilized for CO2 adsorption and circular experimentation.Comparative analysis of TEPA@Co/Zn-ZIF with ZIF-8 and Co/Zn-ZIF was car-ried out using XRD,FT-IR,SEM,and other analytical techniques.The results of the adsorption experiments indicated that the modified material displayed a significantly increased CO2 adsorption capacity of 2.53 mmol/g,representing a 60％improvement over ZIF-8 and a 33％improvement over Co/Zn-ZIF.This enhancement can be attributed to the improved electrostatic interaction between the active metal centers and CO2 following metal do-ping,as well as the chemisorption resulting from the acid-base reaction of-NH2 with CO2.Additionally,TEPA@Co/Zn-ZIF maintained a satisfactory adsorption effect of 1.99 mmol/g even after undergoing five cycles.
关键词
氨基功能化/双金属/ZIFs/CO2吸附Key words
amino functionalization/bimetal/ZIFs/CO2 adsorption引用本文复制引用
出版年
2024
NETL
NSTL
万方数据