Cu-BTC/乙基纤维素混合基质膜的快速制备及气体分离性能

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CO₂渗透系数为112.3barrer，相对于纯EC膜（66.3barrer）提高了69%，且CO₂/CH₄和CO₂/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CO₂溶胀能力。

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

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 CO₂ permeability of MMM with 26wt% Cu-BTC was 112.3 barrer,69% more than that of pure EC,while the CO₂/CH₄ and CO₂/N₂ selectivities were almost unchanged. Moreover,the Cu-BTC/EC membranes showed higher resistance to CO₂-induced swelling than pure EC membrane.