ZIF-8 with exceptional thermal stability: Role of organic cosolvents in phase control and structure stabilization

结晶度 热稳定性 材料科学 化学工程 溶剂 超声 纳米晶 傅里叶变换红外光谱 相(物质) 比表面积 粒径 热分解 催化作用 纳米技术 化学 有机化学 复合材料 工程类
作者
Fraz Saeed Butt,Allana Lewis,Fergus Dingwall,Nurul A. Mazlan,Norbert Radacsi,Xianfeng Fan,Xianfeng Chen,Yaohao Yang,Shuiqing Yang,Yi Huang
出处
期刊:Materials Today Chemistry [Elsevier BV]
卷期号:34: 101804-101804 被引量:13
标识
DOI:10.1016/j.mtchem.2023.101804
摘要

Thermal stability is one of the key factors in catalysis and high-temperature industrial applications. The thermal degradation of ZIF-8, particularly its nanocrystals, could result in a significant loss of surface area and crystallinity, limiting its large-scale applicability. In this study, ZIF-8 nanocrystals with improved thermal stability were synthesized at room temperature (RT) through a facile, one-pot method – an ultrasound-assisted, solvent-guided ZIF-8 growth. The effect of synthesis variables, including the type and concentration of solvent, ultrasonication, and synthesis time, in improving the material's thermal stability was studied systematically. The as-prepared samples were analyzed by TGA/DSC, XRD, SEM/TEM, FTIR, and BET to monitor the weight loss with temperature, sample crystallinity, crystal morphology, chemical structure, and surface area. Notably, synthesis with 5 v/v% of n-hexane (ZIF-8new-ref) demonstrated the formation of highly-crystalline ZIF-8 nanocrystals with extraordinary thermal stability (with only ∼2.0–3.0 % weight loss up to 600 °C), large surface area (i.e., 975 m2 g−1), and an excellent particle size distribution in the range of 0.2–0.4 μm. More importantly, the short synthesis time (2 h) and sonication-assisted pretreatment of the precursor (for promoting solvent-ligand interaction) proved effective and played a crucial role in controlling ZIF-8's thermal stability. The mechanism for the thermal stability enhancement was thus proposed. The highly thermally stable ZIF-8 nanocrystals were also synthesized with significantly reduced chemical usage, e.g., 1/11 of the normal ligand-to-metal ratio (70), achieving cost-effective and environmentally friendly synthesis.
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