Preparation method of 2, 5-furandicarboxaldehyde under illumination condition
A technology of furandiformaldehyde and light conditions, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, catalytic reactions, etc., can solve the problems of unfavorable recycling, environmental pollution, and high cost, and achieve easy The effect of recycling, low price and strong catalytic activity
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Embodiment 1
[0030] Preparation of magnetic nanoparticle-supported 2,2,6,6-tetramethylpiperidine-nitrogen-oxide catalyst:
[0031] Preparation of Citric Acid Functionalized Magnetic Nanoparticles Loaded TEMPO: 1.81g FeCl 3 ·6H 2 O, 0.192g of citric acid and 3.6g of urea were dissolved in 60mL of diglycerin, and the resulting solution was placed in a hydrothermal kettle and heated at 200°C for 4h, then cooled to room temperature, and the black magnetic nanoparticles were magnetically separated, washed with ethanol, 60 ℃ and dried for 6 h to obtain citric acid functionalized magnetic nanoparticles (Fe 3 o 4 -CA);
[0032]Preparation of citric acid-functionalized magnetic nanoparticles loaded with TEMPO: 1 g of citric acid-functionalized magnetic nanoparticles and 0.513 g of 4-amine-2,2,6,6-tetramethyldiphenoxylate (4-amino-TEMPO) were added In the reaction flask, add 60mL of anhydrous dichloromethane, stir the mixture at room temperature, pass through nitrogen protection, 0.879g dicycloh...
Embodiment 2
[0034] Magnetic nanoparticles Fe 3 o 4 Preparation: Add 0.85mL 12.1mol / L HCl to 25mL deoxygenated pure water (bubbled with nitrogen for 30min), weigh 5.2g FeCl 3 and 2.0g FeCl 2 , added to the mixture in turn, stirring constantly to make it evenly dispersed in the solution. The resulting solution was added dropwise to 250 mL of 1.5 mol / L NaOH solution and stirred vigorously to produce a black precipitate. by Fe 3 o 4 Place a magnet near the black precipitate. Separate the pellet in a magnetic field and separate the pellet supernatant. Add purified deoxygenated water to the precipitate to wash the precipitate, and centrifuge at 4000r / min. After repeating the operation three times, 500 mL of 0.01 mol / L HCl solution was added to the precipitate (stirring) to neutralize the anion charges on the nanoparticles. Centrifuge (4000rpm) to separate cationic colloidal nanoparticles again, and add water to digest it, freeze-dry the resulting black solid for 24h, and record it as Fe...
Embodiment 3
[0038] ARS-TiO 2 Preparation: Weigh Alizarin Red S (0.3mmol, 0.103g) and add it to 20mL of absolute ethanol, and use ultrasound for 10min to disperse Alizarin Red S evenly. Then weigh 1.5g of anatase titanium dioxide and add it to the mixed solution, and continue supersonication for 10 minutes, so that the titanium dioxide is uniformly dispersed in the mixed solution of Alizarin Red S and ethanol. After the sonication, the mixture was continuously stirred at room temperature at 500 r / min for 12 hours, the obtained mixture was centrifuged, and the obtained solid was vacuum-dried at 50°C.
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