文献类型：期刊文献

英文题名：Efficient formation of ZIF-8 promoted by DBU for the preparation of ZnO and Ce/ZnO nanomaterials

作者：Chen, Tingting[1];Xu, Yingjie[1];Chen, Bin[1];Xiao, Huiquan[1]

机构：[1]Shaoxing Univ, Dept Chem, 508 Huancheng West Rd, Shaoxing 312000, Zhejiang, Peoples R China

年份：2022

卷号：363

外文期刊名：JOURNAL OF MOLECULAR LIQUIDS

收录：SCI-EXPANDED(收录号：WOS:000831781400011)、、EI(收录号：20223012410246)、Scopus(收录号：2-s2.0-85134664331)、WOS

基金：This work was supported by National Natural Science Founda- tion of China (No. 21978172) , the National Natural Science Founda- tion of Zhejiang Province (No. LY18B060004) and Technological Innovation Project of Zhejiang Province (No. 2019R432023) . The authors also thank Prof. Y. Wang at Zhejiang University for provid- ing the Gaussian 09 suite of programs.

语种：英文

外文关键词：Ionic liquid; ZIF-8; DBU; ZnO; Ce/ZnO; Rhodamine B

外文摘要：In this work, the efficient preparation of zeolitic imidazolate framework-8 (ZIF-8) from Zn2+ and 2-methylimidazole (2-MI) promoted by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) was presented. The mechanism obtained from NMR, MS, DFT calculations, and conductivity shows that [DBUH][2-MI] ionic liquid formed in-situ from proton transfer between DBU and 2-MI can ionize 2-MI to [2-MI](-) and form electrostatic interaction between Zn2+ and [2-MI](-), resulting in the efficient self-assembly of Zn2+ and 2-MI to form ZIF-8. Moreover, the effect of the amount of DBU on ZIF-8 indicates that too much DBU will cause excessive deprotonation of 2-MI, leading to agglomerate of ZIF-8. Accordingly, the optimal ratio to form ZIF-8 is n(DBU): n(2-MI): n(Zn2+) = 2: 25: 1.25, which is also employed to prepare cerium-containing ZIF-8. Moreover, ZnO and Ce/ZnO nanomaterials are prepared by using ZIF-8 and cerium-containing ZIF-8 as precursors respectively, and their structure and morphology are characterized by XRD, FT-IR, SEM, and TEM. Interestingly, Ce content in Ce/ZnO obtained by EDS spectrum is basically consistent with the actual doping amount, indicating that DBU can effectively control the doping of Ce in ZIF-8. Finally, the photocatalytic degradation ability of ZnO and Ce/ZnO for Rhodamine B under visible light and sunlight is investigated in detail. (c) 2022 Elsevier B.V. All rights reserved.