文献类型：期刊文献

英文题名：Synthesis of imine-linked covalent organic frameworks and their adsorption properties for flavonoids

作者：Wei, Xiaohang[1,2];Huang, Dongdong[2,5];Pei, Dong[2,4];Liu, Baoqian[2,3,4];Di, Duolong[1,2,4]

第一作者：Wei, Xiaohang

通信作者：Di, DL[1];Liu, BQ[2];Di, DL[2]

机构：[1]Gansu Univ Chinese Med, Coll Pharm, Lanzhou 730000, Peoples R China;[2]Lanzhou Inst Chem Phys, Chinese Acad Sci, CAS Key Lab Chem Northwestern Plant Resources, Key Lab Nat Med Gansu Prov, Lanzhou 730000, Peoples R China;[3]Shandong Lab Yantai Adv Mat & Green Mfg, Yantai 264003, Peoples R China;[4]Qingdao Ctr Resource Chem & New Mat, Qingdao 266100, Peoples R China;[5]Northwest Normal Univ, Coll Chem & Chem Engn, Lanzhou 730070, Peoples R China

第一机构：甘肃中医药大学药学院（西北中藏药协同创新中心办公室）

通信机构：[1]corresponding author), Gansu Univ Chinese Med, Coll Pharm, Lanzhou 730000, Peoples R China;[2]corresponding author), Lanzhou Inst Chem Phys, Chinese Acad Sci, CAS Key Lab Chem Northwestern Plant Resources, Key Lab Nat Med Gansu Prov, Lanzhou 730000, Peoples R China.|[1073501e14fb35863569f]甘肃中医药大学药学院（西北中藏药协同创新中心办公室）;[10735]甘肃中医药大学;

年份：2023

卷号：348

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20230213352208);Scopus(收录号：2-s2.0-85145605023);WOS:【SCI-EXPANDED(收录号:WOS:000908384500001)】；

基金：This work was financially supported by the National Key R & D Program of China (2019YFD1002400 & 2019YFD1002404), the Science Fund of Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing (AMGM2021F06), the National Natural Science Foundation of China (No. 21904130), and the LICP Cooperation Foundation for Young Scholars (Grant No. HZJJ21-08).

语种：英文

外文关键词：Covalent organic frameworks; Porous materials; Adsorption; Flavonoids

摘要：Isolation and enrichment of flavonoids is difficult due to the complex active components in natural medicinal extracts, and one of the most effective methods is to design adsorbents with high adsorption capacity and excellent selectivity. Covalent organic frameworks (COFs) with a large specific surface area and adjustable pores are increasingly used as adsorbents. Here, two imine-linked COFs (TFPPy-CB and TFPPy-ODH) consisting of 1,3,6,8-tetrakis(4-formylphenyl)pyrene, carbamide, and oxalyl dihydrazide were synthesized using solvothermal methods. They were characterized by XRD, FT-IR, XPS, TGA, SEM, TEM, water contact angle, and N2 adsorption -desorption isotherms. These two highly crystalline COFs have good thermal stability, strong hydrophobicity, and large pore size. The adsorption results were fitted to the general-order model and the Langmuir model, indicating that monolayer adsorption is the dominant adsorption mechanism. At 45 degrees C, the maximum adsorption capacities of luteolin, quercetin, and rutin onto TFPPy-CB were 66.32, 67.85, and 10.69 mg/g, respectively, and onto TFPPy-ODH were 73.20, 70.83, and 9.76 mg/g, respectively. The thermodynamic properties (AH degrees and AS degrees >0, AG degrees <0) indicated that the adsorption of flavonoids onto COFs was a spontaneous endothermic reaction. The COFs exhibited reusability after 5 adsorption-desorption cycles and selectivity for flavonoids in the presence of alkaloid interference. Furthermore, physicochemical properties and adsorption data revealed that the interaction between COFs and flavonoids involved hydrophobic interactions, hydrogen bonding, and 7C-7C interactions. These materials had an extremely short adsorption equilibrium time (less than 10 min) and could potentially be used as adsorbents for the rapid enrichment of flavonoids in complex systems.