Cu-BTC/乙基纤维素混合基质膜的快速制备及气体分离性能  

Facile fabrication and gas separation properties of Cu-BTC/ethyl cellulose mixed matrix membranes

作　　者：李皓[1] 杜乃旭 杨凯[1] 代岩[1] 贺高红[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室,膜科学与技术研究开发中心,辽宁大连116023

出　　处：《化工进展》2016年第12期3970-3975,共6页Chemical Industry and Engineering Progress

基　　金：国家重大科研仪器研制项目(21527812);国家自然科学基金(21236006);教育部长江学者奖励计划项目

摘　　要：金属有机骨架Cu-BTC广泛用于气体分离混合基质膜的制备。为了避免混合基质膜传统制备方法周期较长的缺点,本实验将Cu-BTC前体分别与乙基纤维素(EC)溶液混合后进行反应,实现了Cu-BTC在EC溶液中的快速合成。并利用这一特性制备了Cu-BTC/EC膜。利用扫描电子显微镜、X射线晶体衍射、红外吸收光谱对产品表征,确定了Cu-BTC在膜中的分布情况。实验发现EC浓度的提高对Cu-BTC前体的反应有明显的促进作用。通过Cu-BTC/EC膜的热性能和力学性能测试,发现Cu-BTC和EC的界面强度随Cu-BTC含量的提高先增加后降低。在Cu-BTC质量分数为26%时,膜的CO_2渗透系数为112.3barrer,相对于纯EC膜(66.3barrer)提高了69%,且CO_2/CH4和CO_2/N2选择性几乎没有下降。最后考察了测试压力对气体渗透系数的影响,结果表明Cu-BTC/EC膜相对于纯EC膜具有更好的耐CO_2溶胀能力。Cu-BTC,a metal-organic framework,is widely used as dispersion filler of mixed matrix membranes（MMMs）for gas separation.To accelerate the fabrication of mixed matrix membranes,the precursors of Cu-BTC were individually mixed with ethanol solution of ethyl cellulose（EC） at first and then reacted,achieving the rapid synthesis of Cu-BTC in EC.Cu-BTC/EC MMMs were fabricated accordingly,and characterized via SEM,XRD,and FTIR.The effect of EC concentration on the yield of Cu-BTC was studied,and it showed that EC had promoted the synthesis of Cu-BTC.Thermal,mechanical and gas permeation properties of the Cu-BTC/EC membranes were investigated.The CO_2 permeability of MMM with 26wt% Cu-BTC was 112.3 barrer,69% more than that of pure EC,while the CO_2/CH4 and CO_2/N2 selectivities were almost unchanged.Moreover,the Cu-BTC/EC membranes showed higher resistance to CO_2-induced swelling than pure EC membrane.

关 键 词：膜 二氧化碳捕集 复合材料 金属有机骨架 气体分离 

分 类 号：TQ028.8[化学工程]