Abstract
The chromium-benzenedicarboxylate metal–organic framework (MOF), MIL-101(Cr), is one of the most well-investigated and widely used prototypical MOFs. Regarding its synthesis, the use of a toxic modulator (usually HF) and high reaction temperature (220 °C) are the main factors hindering its further expansion of production and utilization. In fact, high quality MIL-101(Cr) crystals can be prepared at a much lower temperature (160 °C) with spherical morphology via an additive-free approach. Compared to traditional octahedral MIL-101(Cr), the spherical MIL-101(Cr) possesses higher adsorption performance toward dye molecules, including methyl orange (MO) and rhodamine B (RB). The results suggest that toxic additives and high reaction temperatures are not essential in the synthesis of MIL-101(Cr), and the fabrication of spherical MIL-101(Cr) may offer a facile and effective pathway for the large-scale industrial application of MIL-101(Cr).
Highlights
Metal–organic frameworks (MOFs) are a kind of three-dimensional porous crystalline material which are formed by metal ions or metal clusters with organic ligands [1,2]
Compared to traditional porous crystalline materials, MOFs have the characteristics of high specific surface area [3], large porosity [4], and good chemical/thermal stability [5]
The results showed that high-quality MIL-101(Cr) products can be prepared at temperatures as low as 160 ◦C with spherical morphology, which possessed high specific BET surface area (3021 m2 g−1) and quite good yield (>52%)
Summary
Metal–organic frameworks (MOFs) are a kind of three-dimensional porous crystalline material which are formed by metal ions or metal clusters with organic ligands [1,2]. Compared to traditional porous crystalline materials, MOFs have the characteristics of high specific surface area [3], large porosity [4], and good chemical/thermal stability [5]. The HF route shows better crystallinity and porosity for the products; most of the other groups follow the HF approach to synthesize MIL101(Cr) [19,34–37] Both of the above reaction routes occur at 220 ◦C, the yield are relatively low (~50%), and the added HF is a chemical toxicant, which are not advantageous for large-scale industrial syntheses [38]. The results showed that high-quality MIL-101(Cr) products can be prepared at temperatures as low as 160 ◦C with spherical morphology, which possessed high specific BET surface area (3021 m2 g−1) and quite good yield (>52%). N,N-Dimethylformamide (DMF, 99.5%, AR), and Ethanol (99.7%, AR) was acquired from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China)
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