Cu-BTC/乙基纤维素混合基质膜的快速制备及气体分离性能

doi:10.16085/j.issn.1000-6613.2016.12.033

化工进展 ›› 2016, Vol. 35 ›› Issue (12): 3970-3975.DOI: 10.16085/j.issn.1000-6613.2016.12.033

Cu-BTC/乙基纤维素混合基质膜的快速制备及气体分离性能

李皓, 杜乃旭, 杨凯, 代岩, 贺高红

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

收稿日期:2016-03-29 修回日期:2016-05-27 出版日期:2016-12-05 发布日期:2016-12-05
通讯作者: 贺高红,教授,博士生导师,主要研究方向为膜科学与技术、生物医学工程。E-mail:hgaohong@dlut.edu.cn。
作者简介:李皓(1986-),男,博士研究生,主要研究方向为气体膜分离。
基金资助:
国家重大科研仪器研制项目（21527812）、国家自然科学基金（21236006）及教育部长江学者奖励计划项目。

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

LI Hao, DU Naixu, YANG Kai, DAI Yan, HE Gaohong

State Key Laboratory of Fine Chemicals, R & D Center of Membrane Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning, China

Received:2016-03-29 Revised:2016-05-27 Online:2016-12-05 Published:2016-12-05

摘要/Abstract

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。

关键词: 膜, 二氧化碳捕集, 复合材料, 金属有机骨架, 气体分离

Abstract: 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.

Key words: membranes, carbon dioxide capture, composites, metal-organic framework, gas separation

中图分类号:

TQ028.8

李皓, 杜乃旭, 杨凯, 代岩, 贺高红. Cu-BTC/乙基纤维素混合基质膜的快速制备及气体分离性能[J]. 化工进展, 2016, 35(12): 3970-3975.

LI Hao, DU Naixu, YANG Kai, DAI Yan, HE Gaohong. Facile fabrication and gas separation properties of Cu-BTC/ethyl cellulose mixed matrix membranes[J]. Chemical Industry and Engineering Progree, 2016, 35(12): 3970-3975.

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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

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