Improving ZIF-8 stability in the preparation process of polyimide-based organic solvent nanofiltration membrane
Improving ZIF-8 stability in the preparation process of polyimide-based organic solvent nanofiltration membrane
复制标题
提高聚酰亚胺基有机溶剂纳滤膜制备过程中ZIF-8的稳定性
DOI：
10.1016/j.seppur.2019.115687
复制
发表时间：
2019-11
影响因子：
8.6
通讯作者：
Tan Tianwei
中科院分区：
文献类型：
--
作者：
Wang Ze;Si Zhihao;Cai Di;Li Guozhen;Li Shufeng;Qin Peiyong;Tan Tianwei
近年来，咪唑骨架8型分子筛（ZIF-8）因其高的比表面积和独特的孔结构在制备混合基质膜（MMM）方面受到了广泛关注。然而，ZIF-8的结构退化被发现在聚酰亚胺（PI）基MMM的制备过程中，由于在聚酰胺酸（PAA）溶液的酸性环境中的质子化效应。本文提出了一种新的策略来克服这一障碍，通过直接碳化将ZIF-8结构的配位连接基转移到碳骨架中。正如预期的那样，MMM制备过程中完全保留了CZIF-8（CZIF-8）的独特框架。同时，CZIF-8提供了优先的流动路径的溶剂，因为改善的孔隙率和增强的吸附能力的MMM。结果，10wt%CZIF-8/PI MMM对刚果红（MW为696 g mol−1）表现出>90%的高截留率，在水、乙醇和异丙醇中分别表现出16.52、4.05和2.08 L m− 2 h −1bar− 1的出色渗透率。该方法表明了所提出的策略的可行性，并有效地使ZIF-8在酸性环境中的实际应用具有稳定性。
Recently, Zeolitic imidazolate framework-8 (ZIF-8) has drawn considerable attention in preparing mixed matrix membranes (MMMs) because of high specific surface area and unique pore structure. However, the structure degradation of ZIF-8 was found in the preparation process of a polyimide (PI)-based MMM due to the protonation effect in an acid environment of polyamide acid (PAA) solution. Herein, a novel strategy was proposed to overcome this obstacle by transferring the coordinating linkers of ZIF-8 structure into carbon skeleton via direct carbonization. As expected, the unique framework of carbonized ZIF-8 (CZIF-8) was fully retained in MMM preparation process. Meanwhile, CZIF-8 provided preferential flow paths for the solvents because of improved porosity and enhanced sorption capacity for the MMMs. As a result, the 10 wt% CZIF-8/PI MMM exhibited a high rejection of >90% to congo red (MW of 696 g mol−1) and outstanding permeances of 16.52, 4.05 and 2.08 L m−2h−1bar−1in water, ethanol and isopropanol, respectively. This method indicates the feasibility of the proposed strategy and effectively enables the ZIF-8 stability for practical applications in an acid environment.
登录
查看更多内容
影响因子：
8.6
作者：
Farahani, Mohammad Hossein Davood Abadi;Hua, Dan;Chung, Tai-Shung
通讯作者：
Chung, Tai-Shung
影响因子：
10.9
作者：
Hua, Dan;Chung, Tai-Shung
通讯作者：
Chung, Tai-Shung
通过协同酰亚胺化优化制备具有高选择性和性能稳定性的带负电的聚酰亚胺纳滤膜
影响因子：
9.5
作者：
Chenjie Wei;Zhifu He;Ligang Lin;Qi Cheng;Kai Huang;Sisi Ma;Li Chen
通讯作者：
Li Chen
影响因子：
9.5
作者：
Fei, Fan;Cseri, Levente;Blanford, Christopher F.
通讯作者：
Blanford, Christopher F.
影响因子：
9.5
作者：
S. Tsarkov;V. Khotimskiy;Peter M. Budd;V. Volkov;J. Kukushkina;A. Volkov
通讯作者：
S. Tsarkov;V. Khotimskiy;Peter M. Budd;V. Volkov;J. Kukushkina;A. Volkov