超临界流体中ZIF-67的合成及其用于CO_(2)吸附  

Synthesis of ZIF-67 in supercritical fluid and application in adsorption of carbon dioxide

作　　者：王洋 雷洋洋 李锐 唐韶坤[1,2] WANG Yang;LEI Yangyang;LI Rui;TANG Shaokun(School of Chemical Engineering&Technology,Tianjin University,Tianjin 300354,China;Key Laboratory for Green Chemical Technology of Ministry of Education,Tianjin University,Tianjin 300354,China)

机构地区：[1]天津大学化工学院,天津300354 [2]天津大学绿色合成与转化教育部重点实验室,天津300354

出　　处：《应用科技》2025年第1期71-76,共6页Applied Science and Technology

摘　　要：为了解决传统溶剂热法合成金属–有机框架材料需消耗大量有机溶剂且耗时耗能的问题,本文使用超临界二氧化碳作为溶剂合成ZIF-67材料,考察反应温度、压力、时间和物料比例对ZIF-67材料的晶相、形貌和孔结构的影响,并确定制备ZIF-67的适宜条件。结果表明,在40℃、20 MPa、Co^(2+)与2–甲基咪唑物质的量比为1∶4的条件下反应3 h后,得到结晶度高、具有规整十二面体形貌的ZIF-67,比表面积达1182 m^(2)/g。在25℃时,该ZIF-67对二氧化碳的平衡吸附量为1.37 mmol/g,循环5次后吸附量仍可达到1.29 mmol/g。超临界流体(supercritical fluid,SCF)合成ZIF-67无需使用有机溶剂、耗时短,为金属–有机框架材料的绿色高效合成提供了新途径。To avoid the problems of high organic solvent consumption and energy-intensive,time-consuming processes associated with traditional solvothermal synthesis of metal-organic framework materials,this study employed the technology of supercritical carbon dioxide to synthesize ZIF-67.The effects of reaction pressure,temperature,reaction time,and material ratio on the morphology,crystal phase,and pore structure of ZIF-67 were investigated to determine the optimal conditions for its preparation.The results show that at 40℃and 20 MPa,with a molar ratio of Co^(2+)to 2-methylimidazole of 1∶4,the reaction after 3 h yields ZIF-67 with a rhombic dodecahedron morphology and a specific surface area of 1182 m^(2)/g.At 25℃,the equilibrium adsorption capacity of this ZIF-67 for carbon dioxide reaches 1.37 mmol/g,and after 5 cycles,the adsorption capacity remains at 1.29 mmol/g.The synthesis of ZIF-67 using supercritical fluid(SCF)eliminates the need for organic solvents and reduces reaction time,offering a new green and high-efficiency approach for the synthesis of metal-organic framework materials.

关 键 词：金属–有机框架 ZIF-67 溶剂热法 超临界流体 合成 结晶度 孔结构 CO_(2)吸附 

分 类 号：TQ424[化学工程]