-CF3-MOF enhanced pervaporation selectivity of PDMS membranes for butanol separation
-CF3-MOF enhanced pervaporation selectivity of PDMS membranes for butanol separation
复制标题
DOI：
10.1016/j.seppur.2021.120255
复制
发表时间：
2022-02-01
影响因子：
8.6
通讯作者：
Qin, Peiyong
中科院分区：
文献类型：
--
作者：
Ren, Cong;Si, Zhihao;Qin, Peiyong
通过渗透蒸发从发酵液中直接分离丁醇被认为是实现溶剂富集的最有效方法，其中以膜为主。在此，将带有-CF3基团的MOF（MAF-9）掺杂到PDMS基质中以增强丁醇渗透汽化，特别是选择性。 -CF3基团引起的MAF-9的超疏水性使得丁醇分子优先吸附和渗透，从而提高了膜的选择性；而其合适的孔径则为丁醇分子提供了精致的扩散路径，从而增加了膜通量。结果表明，负载优化的MAF-9/PDMS MMM的分离因子为53，膜通量为848 g m(-2) h(-1)，与纯PDMS膜相比，分别提高了24%和16%。通过TGA、FT-IR、BET和XRD表征MAF-9的热稳定性、形貌和结构；通过PALS、SEM、AFM、SD和TGA测试分别评价膜的自由体积特性、形貌、吸附容量和热稳定性。本研究还优化了颗粒负载、进料温度和进料浓度等条件。
Direct separating butanol from fermentation broth via pervaporation is considered as the most effective method to realize solvent enrichment, which is dominated by membranes. Herein, MOF (MAF-9) with -CF3 group is doped into PDMS matrix to enhance the butanol pervaporation, especially selectivity. The super-hydrophobicity of MAF-9 caused by -CF3 groups allows the preferential adsorption and permeation for butanol molecules, thus increasing the membrane selectivity; while its appropriate pore diameter renders the exquisite diffusion pathways towards the butanol molecules, thus increasing the membrane flux. Results show that the loading-optimized MAF-9/PDMS MMM has 53 of separation factor and 848 g m(-2) h(-1) of membrane flux, which are increased by 24% and 16%, respectively, compared with pure PDMS membrane. TGA, FT-IR, BET, and XRD are conducted to characterize the thermal stability, morphology and structure of MAF-9; PALS, SEM, AFM, SD and TGA are tested to evaluate the free volume property, morphology, adsorption capacity and thermal stability of membranes, respectively. Conditions including particle loading, feed temperature and feed concentration are also optimized in this study.