School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
J Environ Sci (China). 2013 Oct 1;25(10):2081-7. doi: 10.1016/s1001-0742(12)60267-8.
Carbon dioxide (CO2) adsorption on a standard metal-organic framework Mg2(dobdc) (Mg/DOBDC or Mg-MOF-74) and a tetraethylenepentamine (TEPA) modified Mg2(dobdc) (TEPA-Mg/DOBDC) were investigated and compared. The structural information, surface chemistry and thermal behavior of the adsorbent samples were characterized by X-ray powder diffraction (XRD), infrared spectroscopy (IR), thermogravimetric analysis (TGA) and nitrogen adsorption-desorption isotherm analysis. CO2 adsorption capacity was measured by dynamic adsorption experiments with N2-CO2 mixed gases at 60 degrees C. Results showed that the CO2 adsorption capacity of Mg/DOBDC was significantly improved after amine modification, with an increase from 2.67 to 6.06 mmol CO2/g adsorbent. Moreover, CO2 adsorption on the TEPA-Mg/DOBDC adsorbent was promoted by water vapor, and the adsorption capacity was enhanced to 8.31 mmol CO2/g absorbent. The adsorption capacity of the TEPA-Mg/DOBDC adsorbent dropped only 3% after 5 consecutive adsorption/desorption cycles. Therefore, this kind of adsorbent can be considered as a promising material for the capture of CO2 from flue gas.
研究并比较了二氧化碳（CO2）在标准金属有机骨架 Mg2(dobdc)（Mg/DOBDC 或 Mg-MOF-74）和四乙烯五胺（TEPA）改性 Mg2(dobdc)（TEPA-Mg/DOBDC）上的吸附情况。通过 X 射线粉末衍射（XRD）、红外光谱（IR）、热重分析（TGA）和氮气吸附-脱附等温线分析对吸附剂样品的结构信息、表面化学和热行为进行了表征。在 60°C 下用 N2-CO2 混合气体进行动态吸附实验测量了 CO2 吸附量。结果表明，胺改性后 Mg/DOBDC 的 CO2 吸附容量显著提高，从 2.67 增加到 6.06 mmol CO2/g 吸附剂。此外，水蒸气促进了 TEPA-Mg/DOBDC 吸附剂上的 CO2 吸附，吸附容量提高到 8.31 mmol CO2/g 吸附剂。TEPA-Mg/DOBDC 吸附剂在 5 次连续吸附/脱附循环后仅下降 3%。因此，这种吸附剂可以被认为是从烟道气中捕获 CO2 的有前途的材料。
