High-yield, fluoride-free and large-scale synthesis of MIL-101(Cr)

Abstract

MIL-101(Cr), one of the most important prototypical MOFs, is well investigated and widely used in many scientific fields. With regard to MOF synthesis in general, the addition of a modifier is commonly used to improve the properties of the products. The effect of inorganic (mineral) and organic acid modifiers was thoroughly investigated in the synthesis of MIL-101(Cr) and HNO3 could increase the yield to over 80% of a product with average SBET > 3200 m(2) g(-1) in repeated experiments (from an average of 50% in most published syntheses) in small-scale laboratory synthesis. The large-scale synthesis could use the finding of HNO3 addition and produce MIL-101(Cr) in >100 g quantities with yields near 70% and BET-surface areas near 4000 m(2) g(-1). The addition of acetic acid (CH3COOH) together with seeding could decrease the reaction temperature, the lowest being 160 °C (from typically 220 °C in published procedures), with still relatively good yield and BET surface area of the product. The use of other strong inorganic or weak carboxylic acids as modulators typically caused a decrease in yield and porosity.

Synthesis of chromene derivatives in the presence of mordenite zeolite/MIL‐101 (Cr) metal–organic framework composite as catalyst

“…The composite showed all the peaks that had been ascribed to individual MIL‐101(Cr) MOF and MOR zeolite, in its XRD pattern. The XRD pattern of composite was matched quite well with patterns that were given in articles, which allowed identifying the product as MOR zeolite and MIL‐101 MOF, respectively.…”

Yolk–shell microspheres assembled from Preyssler‐type NaP5W30O11014− polyoxometalate and MIL‐101(Cr) metal–organic framework: A new inorganic–organic nanohybrid for fast and selective removal of cationic organic dyes from aqueous media

“…Solution pH is an important parameter that affects the adsorption process of dye molecules. The solution pH would affect surface binding sites of the adsorbent and the degree of ionization or dissociation of dye molecules . The effect of initial pH on the adsorption of MB was studied from pH = 2 to 10.…”

“…The solution pH would affect surface binding sites of the adsorbent and the degree of ionization or dissociation of dye molecules. [63][64][65] The effect of initial pH on the adsorption of MB was studied from pH = 2 to 10. As shown in Figure 10b, the removal efficiency towards MB decreased from 100% at pH = 2 to 40% at pH = 10.…”

Metal Organic Frameworks: A New Generation Coordination Polymers for Visible Light Photocatalysis

“…presented the 12 coordinated zirconium‐based MOF [UiO‐66[Zr]: [Zr 6 O 4 [OH] 4 [CO 2 ] 12 ]] in 2008 . Shortly after, another representative of MOF, MIL‐101 [Cr 3 OF[bdc] 3 ] with high stability, emerged. In 2009, Serre and Sanchez prepared the extremely light sensitive Ti 8 O 8 [OH] 4 [O 2 C‐C 6 H 4 ‐ CO 2 ] 6 [MIL‐125[Ti]] that was proved to be a very stable photocatalyst for utilising UV light.…”