Mg-MOF-74的氨改性及其吸附CO_2和水蒸气性能  

CO_2 and H_2O vapor adsorption performance of modifed Mg-MOF-74 via ammonia aqueous solution

作　　者：林俭锋 苏叶[1] 肖静[1] 夏启斌[1] 赵祯霞[1] 李忠[1] 

机构地区：[1]华南理工大学化学与化工学院,广州510640

出　　处：《功能材料》2014年第9期38-42,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21176085);国家重点基础研究发展规划(973计划)资助项目(2013CB733506);中央高校基本科研业务费专项资金资助项目(2013ZM0056);亚热带建筑科学国家重点实验室资助项目(C713001Z)

摘　　要：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@MgMOF-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0.66mmol/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 [e-mail] 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 smaller,but their CO2 adsorption capacities on per unit surface area of adsorbent became significantly higher compared 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 addition,the amount adsorbed of water vapor on the modified materials for were greatly decreased.e.g.,the adsorption 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.

关 键 词：CO2吸附 水蒸气 吸附性 Mg-MOF-74 改性 氨水 

分 类 号：TQ424.3[化学工程]