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Preparation method and application of photocatalyst, copper calcium titanate containing high-density oxygen vacancy

A technology of calcium copper titanate and photocatalyst, applied in metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, chemical element of heterogeneous catalyst, etc., can solve the problem of inability to use visible light, wide band gap, etc. problem, to achieve the effect of high crystallinity, uniform size distribution and high yield

Inactive Publication Date: 2017-08-11
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only overcomes the shortcomings of oxides with wide bandgap and cannot use visible light, but also makes up for the shortcomings of sulfide instability due to its diamond-like structure.

Method used

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  • Preparation method and application of photocatalyst, copper calcium titanate containing high-density oxygen vacancy
  • Preparation method and application of photocatalyst, copper calcium titanate containing high-density oxygen vacancy
  • Preparation method and application of photocatalyst, copper calcium titanate containing high-density oxygen vacancy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Accurately weigh 0.0049mol of calcium oxide 0.28g, 0.0146mol of copper oxide 1.1645g, and 0.019mol of titanium dioxide 1.56g in a molar ratio, and grind at a constant speed for 30 minutes to obtain a uniform and fine powder mixture;

[0022] b. Add 4.7028 g of 0.1 mol molten salt sodium fluoride to the mixture obtained in step a, and continue grinding for 120 minutes to obtain a uniform mixture of fine particles;

[0023] c. Pour the mixed powder obtained in step b into a crucible, place it in a high-temperature tube furnace, raise the temperature to 800°C in 400 minutes at a heating rate of 2°C / min, and react for 6 hours to obtain a solid powder;

[0024] d. Remove the solid powder obtained in step c from the crucible, grind it evenly for 40 minutes, pour it into a beaker filled with 800mL water and stir for 5 hours, let it stand for 30 minutes, so that all the particles sink, and then slowly pour out the supernatant , continue to stir with 100mL of absolute ethanol...

Embodiment 2

[0026] a. Accurately weigh 0.0049mol of calcium oxide 0.28g, 0.0146mol of copper oxide 1.1645g, and 0.019mol of titanium dioxide 1.56g in a molar ratio, and grind at a constant speed for 30 minutes to obtain a uniform and fine powder mixture;

[0027] b. Add 5.844 g of 0.1mol molten salt sodium chloride to the mixture obtained in step a, and continue grinding for 120 minutes to obtain a uniform mixture of fine particles;

[0028]c. Pour the mixed powder obtained in step b into a crucible, place it in a high-temperature tube furnace, raise the temperature to 800° C. in 400 minutes at a heating rate of 2° C. / min, and react for 6 hours to obtain a solid powder;

[0029] d. Remove the solid powder obtained in step c from the crucible, grind it evenly for 40 minutes, pour it into a beaker filled with 800mL water and stir for 5 hours, let it stand for 30 minutes, so that all the particles sink, and then slowly pour out the supernatant , continue to stir with 100mL of absolute ethano...

Embodiment 3

[0031] a. Accurately weigh 0.0049mol of calcium oxide 0.28g, 0.0146mol of copper oxide 1.1645g, and 0.019mol of titanium dioxide 1.56g in a molar ratio, and grind at a constant speed for 30 minutes to obtain a uniform and fine powder mixture;

[0032] b. Add 10.289 g of 0.1 mol molten salt sodium bromide to the mixture obtained in step a, and continue grinding for 120 minutes to obtain a uniform mixture of fine particles;

[0033] c. Pour the mixed powder obtained in step b into a crucible, place it in a high-temperature tube furnace, raise the temperature to 800° C. in 400 minutes at a heating rate of 2° C. / min, and react for 6 hours to obtain a solid powder;

[0034] d. Remove the solid powder obtained in step c from the crucible, grind it evenly for 40 minutes, pour it into a beaker filled with 800mL water and stir for 5 hours, let it stand for 30 minutes, so that all the particles sink, and then slowly pour out the supernatant , continue to stir with 100mL of absolute etha...

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Abstract

The invention relates to a preparation method and application of a photocatalyst, copper calcium titanate containing high-density oxygen vacancy. The preparation method includes: utilizing a one-step molten salt method; controlling morphology and oxygen vacancy content by changing molten salt composition during synthesis; using metal oxide as a raw material; grinding and calcining the raw material to form a high-purity photocatalyst; calcining before washing the high-purity photocatalyst. The preparation method has the advantages of few raw material type, simple operation, adjustable molten salt composition, mild condition and simple process. A copper calcium titanate photocatalysis material obtained by the preparation method is high in yield, uniform in distribution and free of introduction of other mixed elements; by introducing oxygen vacancy, compositing of photo-induced electron hole pairs can be inhibited effectively, and the material is endowed with excellent visible light photocatalysis performance and is better than a commercial star photocatalysis material, titanium dioxide (P25). The defect that visible light cannot be used due to wide oxide band gap is overcome, and the defect that sulfide is unstable is made up due to the characteristic that the catalyst is of a diamond-like structure.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic nanomaterial preparation, and in particular relates to a preparation method and application of a visible light photocatalyst copper calcium titanate containing high-density oxygen defects. Background technique [0002] Energy and environmental issues are two huge challenges facing the world today, and effectively solving these two issues is related to whether all mankind can achieve sustainable development. Compared with traditional pollutants in water, persistent organic pollutants have a stable chemical structure, high toxicity, and are difficult to degrade, so they have persistent pollution characteristics such as long-distance migration and bio-accumulation. Semiconductor photocatalytic degradation of organic pollutants is fast and can be carried out at room temperature, and finally can completely mineralize and decompose organic pollutants into CO 2 、H 2 O and other inorganic salts, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C01G23/00C02F1/30
CPCC01G23/003C02F1/30B01J23/002B01J23/78C01P2004/03C02F2305/10B01J2523/00B01J35/39B01J2523/17B01J2523/23B01J2523/47Y02W10/37
Inventor 王传义热沙来提·海里里
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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