Simple method for preparing Co-Nx/C efficient selective photocatalyst

A photocatalyst and selective technology, applied in physical/chemical process catalysts, chemical instruments and methods, preparation of quinone oxides, etc., can solve the problems of low singlet oxygen quantum yield, low quantum yield, poor selectivity, etc. Achieve the effect of improving selective photocatalytic oxidation ability, enhancing singlet oxygen generation, and low cost

Inactive Publication Date: 2017-12-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI-Extracted Technical Summary

Problems solved by technology

However, the quantum yield of singlet oxygen is not high. Only with the help of efficient photosensitizers can molecular oxygen obtain energy and convert into singlet oxygen.
[0003] Over the past few decades, a series of photosensitizers have been used to generate 1 o 2 : heavy atom (bromine,...
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Abstract

Depletion of energy resources and environmental pollution are two problems needing to be resolved immediately at present, and rich solar energy provides an efficient path for solving the two problems. Effective conversion of luminous energy and chemical energy cannot be performed without a photosensitive nano-material with excellent photocatalytic activity. A metal-organic complex serves as a precursor, and the Co-Nx/C efficient selective photocatalyst is prepared through a simple one-step heat polymerization method. The invention belongs to the field of carbon material science. The organic ligand is selected from dimethylglyoxime with low price and high coordination ability, a low-price transition metal salt (cobalt chloride) is selected in the metal center, and after high-temperature calcinations, the catalytic active site (Co-Nx) is successfully introduced into the catalyst. The Co-Nx/C catalyst is capable of selectively sensitizing oxygen so as to produce high-activity singlet oxygen. The Co-Nx/C active center is formed, the energy difference (Delta EST) between a singlet state and a triplet state is reduced, the intersystem crossing (ISC) process is promoted, production of the singlet oxygen is enhanced, and the selective photocatalytic oxidation ability is improved.

Application Domain

Physical/chemical process catalystsQuinone preparation by oxidation

Technology Topic

Chemical energyComputational chemistry +17

Image

  • Simple method for preparing Co-Nx/C efficient selective photocatalyst
  • Simple method for preparing Co-Nx/C efficient selective photocatalyst
  • Simple method for preparing Co-Nx/C efficient selective photocatalyst

Examples

  • Experimental program(5)

Example Embodiment

[0015] Example 1
[0016] Weigh 2.75g of diacetyl oxime and 2.5g of cobalt chloride and dissolve them in 80ml of acetone respectively, then slowly add the cobalt chloride solution to the diacetyl oxime solution and stir continuously. After stirring for 5 minutes, the mixed solution Let stand for 24h at room temperature. Finally, the mixture was filtered to obtain a green precipitate, which was washed with acetone three times, and then dried under vacuum at 60°C to obtain the metal-organic complex precursor; 2g of the metal-organic complex precursor was weighed and spread evenly to Quartz boat, then put the quartz boat in the tube heating furnace, N 2 Replace for 30 minutes, drive off the oxygen in the tube, start the heating device, and heat up at a heating rate of 5°C/min. After raising the temperature to 300°C, maintaining a constant temperature for 2 hours, then cooling it naturally, and taking it out after cooling to room temperature. The obtained solid was washed with water and ethanol three times, and finally dried in a vacuum drying oven to obtain a highly efficient selective photocatalyst. The prepared photocatalyst is used to catalyze 1,5-dihydroxynaphthalene, the reaction time is 100 minutes, and the yield of juglone is 32.29%.

Example Embodiment

[0017] Example 2
[0018] According to the main process method in Example 1, the thermal polymerization temperature was changed and the temperature was increased to 250°C. The prepared photocatalyst was used to catalyze 1,5-dihydroxynaphthalene. The reaction time was 100 minutes, and the yield of juglone was 18.86%. .

Example Embodiment

[0019] Example 3
[0020] According to the main process method in Example 1, the thermal polymerization temperature was changed, the temperature was increased to 350°C, and the prepared photocatalyst was used to catalyze 1,5-dihydroxynaphthalene. The reaction time was 100 minutes, and the yield of juglone was 24.00%. .

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