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Preparation method and application method of TPP/TiO2/CuO visible-light-induced photocatalyst

A visible light and catalyst technology, used in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. High visible-light catalytic decomposition of water for hydrogen production and improved stability

Pending Publication Date: 2020-06-09
TONGREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Semiconductor visible light photocatalytic decomposition of water to produce hydrogen is the most promising way to solve the two major problems of energy shortage and environmental pollution. TiO 2 It has high stability, light corrosion resistance, non-toxic characteristics, and does not produce secondary pollution during the process, so it is a good semiconductor photocatalyst, but TiO 2 The band gap is large (3.2eV), and it only responds to ultraviolet light that accounts for 4% of sunlight, which limits the TiO 2 Practical applications, how to expand TiO 2 Absorption range, preparation of highly active visible light response modified TiO 2 Materials become the difficulty of research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、4

[0022] Example 1, 4wt%TPP / TiO 2 / 3wt%CuO

[0023] According to the loading of TPP in the photocatalyst as 4wt%, prepare 4wt%TPP / TiO 2 : disperse 20mL of butyl titanate into 30mL of dry n-butanol and stir for 30min, disperse 0.200g of TPP into 50mL of water, and put it into an ice-water bath, and disperse the butyl titanate solution at a speed of 0.5mL / min Add it into the aqueous solution of TPP through a peristaltic pump. After the liquid is transferred, continue to stir vigorously for 1h. The above mixture is freeze-dried, and then heated at 300 o C burning for 2h to get TPP / TiO 2 Core-shell structure.

[0024] According to the loading of CuO in the photocatalyst as 3wt%, the preparation of 4wt%TPP / TiO 2 / 3wt%CuO: TPP porphyrin / TiO prepared above 2 Disperse in distilled water, add 0.450g of Cu(NO 3 ) 2 ∙3H 2 O(0.1mol∙L -1 ) solution, the above solution was stirred for 4h, evaporated to dryness, and washed with distilled water several times to remove unbound Cu on the...

Embodiment 2、8

[0025] Example 2, 8wt%TPP / TiO 2 / 3wt%CuO

[0026] According to the loading of TPP in the photocatalyst as 8wt%, prepare 8wt%TPP / TiO 2 : Disperse the butyl titanate of 19mL into 30mL of dry n-butanol and stir for 30min, disperse the TPP of 0.400g into 50mL water, and put it into an ice-water bath, and disperse the butyl titanate solution at a speed of 0.5mL / min Add it into the aqueous solution of TPP through a peristaltic pump. After the liquid is transferred, continue to stir vigorously for 1h. The above mixture is freeze-dried, and then heated at 300 o C burning for 2h to get TPP / TiO 2 Core-shell structure.

[0027] According to the loading of CuO in the photocatalyst as 3wt%, the preparation of 4wt%TPP / TiO 2 / 3wt%CuO: TPP porphyrin / TiO prepared above 2 Disperse in distilled water, add 0.450g of Cu(NO 3 ) 2 ∙3H 2 O(0.1mol∙L -1 ) solution, the above solution was stirred for 4h, evaporated to dryness, and washed with distilled water several times to remove unbound Cu o...

Embodiment 3、12

[0028] Example 3, 12wt%TPP / TiO 2 / 3wt%CuO

[0029] According to the loading of TPP in the photocatalyst as 12wt%, prepare 12wt%TPP / TiO 2 : Disperse the butyl titanate of 18mL into 30mL of dry n-butanol and stir for 30min, disperse the TPP of 0.600g into 50mL water, and put it into an ice-water bath, and disperse the butyl titanate solution at a speed of 0.5mL / min Add it into the aqueous solution of TPP through a peristaltic pump. After the liquid is transferred, continue to stir vigorously for 1h. The above mixture is freeze-dried, and then heated at 300 o C burning for 2h to get TPP / TiO 2 Core-shell structure.

[0030] According to the loading of CuO in the photocatalyst as 3wt%, the preparation of 6wt%TPP / TiO 2 / 1wt%CuO: TPP porphyrin / TiO prepared above 2 Disperse in distilled water, add 0.450g of 0.1mol∙L -1 Cu(NO 3 ) 2 ∙3H 2 O solution. The above solution was stirred for 4 hours, evaporated to dryness, and washed with distilled water several times to remove unbou...

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PUM

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Abstract

The invention provides a preparation method of a TPP / TiO2 / CuO (TPP is tetraphenol porphyrin) visible-light-induced photocatalyst, wherein the complex is obtained by loading a cocatalyst CuO on a core-shell structure formed by a photosensitizer TPP and a main catalyst TiO2. According to the invention, the energy band positions of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the TPP are matched with the TiO2 energy level structure, so that quick transfer of photon-generated carriers is facilitated, the stability of the catalyst is improved,and the catalyst has response to visible light; the CuO cocatalyst is loaded on the surface of the TPP / TiO2 structure, so that the transfer of photo-induced electrons is accelerated while the active sites of the photocatalytic reaction are provided; the transmission path of photo-induced electrons in the composite catalyst is TPP -> TiO2 -> CuO, the continuous transmission path of the photo-induced electrons is beneficial to separation and transfer of the photo-induced electrons and holes, and the utilization rate of the photo-induced electrons is effectively increased; and the composite catalyst is suitable for the fields of preparation of hydrogen by photocatalytic decomposition of water, degradation of pollutants and the like.

Description

technical field [0001] The invention relates to the technical field of photocatalytic water splitting hydrogen production, specifically a TPP / TiO 2 / CuO visible photocatalyst preparation and application methods. Background technique [0002] Semiconductor visible light photocatalytic decomposition of water to produce hydrogen is the most promising way to solve the two major problems of energy shortage and environmental pollution. TiO 2 It has high stability, light corrosion resistance, non-toxic characteristics, and does not produce secondary pollution during the process, so it is a good semiconductor photocatalyst, but TiO 2 The band gap is large (3.2eV), and it only responds to ultraviolet light that accounts for 4% of sunlight, which limits the TiO 2 Practical applications, how to expand TiO 2 Absorption range, preparation of highly active visible light response modified TiO 2 Materials become the difficulty of research. Contents of the invention [0003] The prese...

Claims

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Application Information

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IPC IPC(8): B01J31/38C01B3/04
CPCB01J31/38C01B3/042B01J35/39B01J35/397Y02E60/36
Inventor 孟建玲彭良佩
Owner TONGREN UNIV
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