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Chemicals from Aromatic Hydrocarbons
Published in James G. Speight, Handbook of Petrochemical Processes, 2019
Terephthalic acid is an important monomer for producing polyesters. The main route for obtaining the acid is the catalyzed oxidation of p-xylene.
Adsorption of Biologically Active Compounds on Mesoporous MOFs in Water
Published in Alexander Samokhvalov, Adsorption on Mesoporous Metal-Organic Frameworks in Solution for Clean Energy, Environment, and Healthcare, 2017
MIL-100(Fe) is one of the most well-known mesoporous MOFs with low toxicity (Bellido et al. 2014). Aluminum is a nontoxic metal, and aluminum hydroxide is an active ingredient of many over-the-counter (OTC) antacids. Specifically, an oral LD50 of most aluminum salts at 200–1000 mg/kg is comparable to the LD50 of calcium at 1000 mg/kg (Farrusseng 2011). Therefore, certain mesoporous MIL-100(Al) (Van de Voorde et al. 2013) and MIL-101(Al) (Haque et al. 2014) are expected to be of low toxicity. Regarding the affordability of mesoporous MOFs as potential industrial-scale sorbents, one can expect a significant price reduction of MIL-101 synthesized from inexpensive terephthalic acid. Terephthalic acid is a large-scale industrial commodity chemical that is produced from the p-xylene fraction from a petroleum refinery. The main industrial use of terephthalic acid is in the production of polyethylene terephthalate (PETE), aka polyester.
Synthesis of a chromium terephthalate metal organic framework and use as nanoporous adsorbent for removal of diazinon organophosphorus insecticide from aqueous media
Published in Journal of Dispersion Science and Technology, 2019
Jafar Shadmehr, Sedigheh Zeinali, Maryam Tohidi
Thermogravimetric analysis was employed to investigate the thermal stability of the MIL-101(Cr). According to the literature,[60] the MOF which was studied in this research had two internal cavities with diameters of 29 and 34 Angstrom. Figure 4 shows the sample weight changes with temperature elevation. As illustrated, weight reduction occurred in three stages. In the first stage, water molecules trapped in the larger cavities (34 Angstrom), which formed 5% of MIL-101(Cr) weight, evaporated under the temperature ranges of 25–200 °C. At the temperature ranges of 200–377 °C, water molecules trapped in the fine cavities (29 Angstrom) were disappeared. Evaporation of water molecules at this stage led to reduction of 25% of the weight of MIL-101(Cr). Finally, in the third stage, removal of OH/F groups resulted in degradation of MIL-101(Cr) structure at the temperature ranges of 377–500 °C.[62] This is obviously demonstrated in DTA (differential thermal analysis) curve which is presented in Figure 4. In this curve, a minimum peak at 377 °C was observed which is due to melting of terephthalic acid structure. This result can approved the TGA results well.