采取了水热法合成 Mg-MOF-74晶体,然后提出应用氨水对Mg-MOF-74晶体材料进行表面改性制得NH3＠Mg-MOF-74,并对改性后的材料进行了表征以及吸附CO2和水蒸气性能测定.结果表明,与原始的Mg-MOF-74晶体相比,改性后的 NH3＠Mg-MOF-74材料其比表面积变小了,但其单位比表面积对 CO2的吸附容量却增加了.尤其是在 P/P0＜0．0010压力范围内,其 CO2吸附容量明显提高.在低压条件下它对CO2的吸附容量达到0．66 mmol/g,比原始的Mg-MOF-74晶体材料的吸附量提高了65％.水蒸气吸附实验结果表明,NH3＠Mg-MOF-74的水蒸气吸附量明显低于 Mg-MOF-74的吸附量,在相对湿度RH＝10％时,NH3＠Mg-MOF-74对水蒸气的吸附容量降低了50％.表明它的憎水性能得到提高.
In this work,Mg-MOF-74 crystals were synthesized by hydrothermal synthesis method,and then modified by ammonia aqueous solutions of different concentrations to obtain the modified materials NH3@Mg-MOF-74.The CO2 and water vapor isotherms on the NH3@Mg-MOF-74 were determined by means of gravity method.Results show that the specific surface area of the modified materials NH3@Mg-MOF-74 became smal-ler,but their CO2 adsorption capacities on per unit surface area of adsorbent became significantly higher com-pared to Mg-MOF-74.Especially at P/P0 below 0.0010,the CO2 adsorption capacity of NH3@Mg-MOF-74-2#reached 0.66 mmol/g,having an increase of 65% in comparison with the original material Mg-MOF-74.In addi-tion,the amount adsorbed of water vapor on the modified materials for were greatly decreased.e.g.,the adsorp-tion capacity of the NH3@Mg-MOF-74-1# for water vapor was reduced by 50% at RH=10%,suggesting that its hydrophobic property was improved significantly.
参考文献
| [1] | Watts R G.Global warming and the future of the earth[M].New Jersey:Morgan & Claypool Publishers,2007 |
| [2] | Zhang Wenming .Rearch review on carbon dioxide's influ-ence in airtight environment and its hygiene standards[J].Journal of Preventive Medicine of Chinese People's Liber-ation Army,1994,12(01):84-86. |
| [3] | Knox J C;Howard D F.Performance enhancement, power reduction,and other flight concerns-testing of the CO2 removal assembly for ISS[A].,1999 |
| [4] | Gerard Ferey .Hybrid porous solids: past, present, future[J].Chemical Society Reviews,2008(1):191-214. |
| [5] | Shengqian Ma .Gas adsorption applications of porous metal–organic frameworks[J].Pure and Applied Chemistry,2009(12):2235-2251. |
| [6] | Jian Liu;Praveen K. Thallapally;B. Peter McGrail .Progress in adsorption-based CO2 capture by metal-organic frameworks[J].Chemical Society Reviews,2012(6):2308-2322. |
| [7] | Caskey SR;Wong-Foy AG;Matzger AJ .Dramatic tuning of carbon dioxide uptake via metal substitution in a coordination polymer with cylindrical pores[J].Journal of the American Chemical Society,2008(33):10870-10871. |
| [8] | Wang Lijian;Li Xin;Xia Qibin et al.Catalytic combus-tion of toluene over cobalt based catalysts prepared bu chemical reduction with ethylene glycol[J].Journal of Functional Materials,2012,43(07):835-838. |
| [9] | Zhang Zhijuan;Xian Shikai;Xia Qibin.Enhancement of CO2 adsorption and CO2/N2 selectivity on ZIF-8 via postsynthetic modification[J].AIChE,2012 |
| [10] | Zhang, Z.;Xian, S.;Xi, H.;Wang, H.;Li, Z. .Improvement of CO_2 adsorption on ZIF-8 crystals modified by enhancing basicity of surface[J].Chemical Engineering Science,2011(20):4878-4888. |
| [11] | Zhang Zhijuan;Li Zhong .Adsorption of CO2 on zeolite 13X and activated carbon with high surface area[J].Sep-aration Science and Technology,2010,45(05):710-719. |
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