Functionalized metal-organic polyhedra hybrid membranes for aromatic hydrocarbons recovery

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• 作者：Cui Zhao ; Naixin Wang ; Lin Wang ; Shunan Sheng ; Hongwei Fan ; Fan Yang ; Shulan Ji ; Jian-Rong Li and Jiamei Yu
• 刊名：AIChE Journal
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：62
• 期：10
• 页码：3706-3716
• 全文大小：1036K
• ISSN：1547-5905

文摘

Pervaporation membranes are potentially useful in the separation of aromatic/aliphatic mixtures. Wherein, the membrane material plays a key role. Herein, a series of functionalized metal-organic polyhedra (MOPs)/hyperbranched polymer hybrid membranes are molecularly designed and fabricated for the recovery of aromatic hydrocarbons. The isostructural MOP molecules with different functional groups are uniform in shape/size and soluble in solvents, which enable them to disperse well and be compatible in/with the polymer. Pervaporation results demonstrated significant improvements of these membranes in separation performances. Particularly, the membrane with MOP-SO₃Na_nH_m showed the separation factor of 8.03 and the permeation flux of 528 g/m²h for the recovery of toluene from its 50 wt % n-heptane mixture, and those values are 8.4 and 540 g/m²h for benzene/cyclohexane mixture. We propose that the selectivity of these membranes is affected primarily by the polarity of functional groups in MOPs, which were further explained by the adsorption experiments and molecular simulations.