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Synthesis and Characterization of Metal–Organic Frameworks
Published in T. Grant Glover, Bin Mu, Gas Adsorption in Metal-Organic Frameworks, 2018
The same strategy was applied to synthesize MIL-53(Al) [Al(OH)(BDC)] in 5 min.65 In the conventional MIL-53 synthesis, H2BDC is used as an organic source, while, due to the low solubility of H2BDC in water, sodium benzenedicarboxylate (Na2BDC) was used instead. The BET surface area prepared by the continuous flow synthesis was estimated to be 919 m2/g, which was slightly lower than that of batch synthesis (1097 m2/g). It is worth noting that STY of MIL-53(Al) prepared by the flow process is ca. 1300 kg/(m3·d). This value is significantly greater than the STY values for the synthesis in academia [1–10 kg/(m3·d)] and approaching the values for industrial scaled-up synthesis [e.g., 5300 kg/(m3·d) for Al(OH)(fumarate)].66,67
Tio2 coating on alumina membranes for continuous separation of dyes
Published in Surface Engineering, 2023
X. Y. Li, J. H. Gong, J. H. Ma
Manjumol et al. prepared Al2O3 membranes modified with multi-layer coatings of Titania and boehmite nanoparticles by a so-gel process. The obtained ultrafiltration pore-size membranes were photoactive and their multifunctional property could be utilised in water purification [9]. Mastropietro et al. fabricated an ultrathin TiO2 layer on α-Al2O3 membranes, which showed high efficiency in the photodegradation of azo dye pollutants, and the self-cleaning properties rendered antifouling procedures unnecessary [5]. Chen et al. fabricated a thin SiC layer on Al2O3 membranes at a relatively low temperature via the LPCVD method. These membranes could be used to filter oil-in-water emulsions and showed little fouling [2]. Amirilargani et al. first synthesized two kinds of metal–organic frameworks (MOFs) materials on α-Al2O3 membranes, including NH2-MIL-53(Al) and MIL-53(Al). The MOF-based membranes with unique morphology showed good adsorption performance for high concentrations of Rose Bengal dye [6]. Chen et al. demonstrated an efficient strategy to produce tubular nanofiltration membranes via ALD technology. Titanium alkoxide was deposited on ceramic membranes and then calcined into TiO2. This thin TiO2 separation layer provided the sieving function of nanofiltration size [15]. Hydrothermal synthesis is a facile and cost-effective method to obtain nanostructures (nanowires, nanorods, and nanoflakes), and the morphology could be easily tailored by adjusting the forming conditions [19]. However, there are few attempts to prepare TiO2-coated alumina membrane by hydrothermal method for the application of photocatalysis combined with water filtration.