Kim TongIl, Yun HakSung, Han GwangBok, Lian Jiabiao, Ma Jianmin, Duan Xiaochuan, Zhu Lianjie, Zheng Wenjun
Institute of Chemistry and Biology, University of Science Unjong District Pyongyang D. P. R. Korea.
Department of Materials Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, TKL of Metal and Molecule-Baced Material Chemistry, College of Chemistry, Nankai University Tianjin 300071 P. R. China
RSC Adv. 2019 Apr 16;9(21):11894-11900. doi: 10.1039/c8ra10524c. eCollection 2019 Apr 12.
Herein, mesoporous ZnAlO spinel nanoflakes were prepared by an ion-exchange method from a Na-dawsonite parent material in the presence of an ionic liquid, 1-butyl-2,3-dimethylimidazolium chloride ([bdmim][Cl]), followed by calcination at 700 °C for 2 h. The as-obtained products were characterized by several techniques such as X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). The ZnAlO nanoflakes with the thickness of ∼20 nm were composed of numerous nanoparticles, which resulted in a high specific surface area of 245 m g. The formation mechanism of the ZnAlO nanoflakes was comprehensively investigated, and the results showed that a 2D growth process of the ZnAl(OH)(CO)·4HO crystallites with the assistance of [bdmim][Cl] was the key for the induction of ZnAlO nanoflakes. Moreover, mesopores were formed between adjacent nanoparticles due to the release of CO and HO molecules from ZnAl(OH)(CO)·4HO during the calcination process.
在此，通过离子交换法，以钠菱沸石母体材料为原料，在离子液体1-丁基-2,3-二甲基咪唑氯盐（[bdmim][Cl]）存在的情况下制备了介孔ZnAlO尖晶石纳米片，随后在700℃下煅烧2小时。通过多种技术对所得产物进行了表征，如X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、热重分析（TGA）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和能量色散X射线光谱（EDX）。厚度约为20nm的ZnAlO纳米片由大量纳米颗粒组成，这导致其具有245m²/g的高比表面积。对ZnAlO纳米片的形成机理进行了全面研究，结果表明，在[bdmim][Cl]的辅助下，ZnAl(OH)(CO₃)·4H₂O微晶的二维生长过程是诱导ZnAlO纳米片的关键。此外，在煅烧过程中，由于ZnAl(OH)(CO₃)·4H₂O中CO₂和H₂O分子的释放，相邻纳米颗粒之间形成了介孔。
