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.
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