摘要
采用溶剂热法合成金属有机骨架材料MIL-101(Cr),用回流法将五乙烯六胺(PEHA)负载到MIL-101(Cr)孔道中的不饱和金属位点上,使用扫描电镜、粉末X射线衍射、氮气物理吸附、元素分析和傅里叶变换红外光谱等表征手段考察材料的结构和形貌,测试氨基改性前后的MIL-101(Cr)在25℃、不同压力下对CO_2的吸附效果。结果表明,负载0.24 m L五乙烯六胺后的MIL-101(Cr)对CO_2的吸附效果最好,在25℃、常压下对CO_2的饱和吸附量可达58.944 mg/g,相比未负载五乙烯六胺的MIL-101(Cr)吸附量(CO_2饱和吸附量为44.208 mg/g)增加了33%。随着吸附压力的增加,MIL-101(Cr)和0.24PEHAM IL-101(Cr)对CO_2的饱和吸附量逐渐增加,当吸附压力为1.1 MPa时,两者的吸附量分别为1 147.59和1 256.74 mg/g,表明该类材料在高压下对CO_2有着良好的吸附效果。
The metal-organic framework MIL-101（Cr）was synthesized via hydrothermal process and then modified with pentaethylenehexamine（PEHA）through refluxing in ethanol.Various measures such as SEM,XRD,N2 sorption,Elemental analysis and FT-IR were used to characterize the structure,morphology and properties of PEHA-grafted MIL-101（Cr）.Meanwhile,the performance of PEHA-grafted MIL-101（Cr）in CO2adsorption was investigated under 25℃.The results illustrate that the loading of PEHA in MIL-101（Cr）can conspicuously enhance the CO2adsorption capacity.PEHA-grafted MIL-101（Cr）with a PEHA loading of0.24 m L exhibits the highest capacity for CO2adsorption;the adsorption capacity reaches 58.944 mg/g at 25℃and atmospheric pressure,which is 33%higher than that of the unmodified MIL-101（Cr）（44.208 mg/g）.In addition,the CO2adsorption capacities on both MIL-101（Cr）and PEHA-MIL-101（Cr）are greatly enhanced by increasing pressure,reaching 1 147.59 and 1 256.74 mg/g at 1.1 MPa,respectively.These results suggest that PEHA-modified MIL-101（Cr）could be a good candidate adsorbent for CO2capture at high pressure.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2017年第4期484-490,共7页
Journal of Fuel Chemistry and Technology
