Preparation method of highly visible light electron transfer g-C3N4/ Au/TiO2 Z type photocatalyst

An electron transfer and photocatalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high electron-hole recombination rate and weak visible light responsiveness, and achieve enhanced responsiveness. Effect

Inactive Publication Date: 2016-05-04
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the disadvantages of high electron-hole recombination rate and weak visible light response ability of existing semiconductor catalysts in photocatalysis, and provide a high-visible photoelectron transfer g-C 3 N 4 / Au / TiO 2 Preparation method of similar Z-type photocatalyst

Method used

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  • Preparation method of highly visible light electron transfer g-C3N4/ Au/TiO2 Z type photocatalyst
  • Preparation method of highly visible light electron transfer g-C3N4/ Au/TiO2 Z type photocatalyst
  • Preparation method of highly visible light electron transfer g-C3N4/ Au/TiO2 Z type photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0036] 1. Photocatalyst g-C 3 N 4 / Au / TiO 2 preparation of

[0037] (1) g-C 3 N 4 Preparation: Precursor pyrolysis polymerization method is adopted. Weigh 5g of dicyandiamide into a covered crucible, first raise it from room temperature to 500°C at a rate of 10°C / min in the muffle furnace, and keep the temperature constant for 2 hours; then raise it to 520°C at a rate of 5°C / min ℃, constant temperature 2h (deammonization process). Allow the system to cool naturally afterwards, and obtain light yellow g-C after grinding 3 N 4 powder.

[0038] (2) Solution preparation: 1gAuCl 3 ·HCl·4H 2 O was dissolved in 100 mL deionized water to make 10 mg / mL AuCl 3 ·HCl·4H 2 O stock solution.

[0039] (3) Au / TiO 2 Preparation: using photoreduction deposition method. 0.3gTiO 2 Add 60mL deionized water and 15mL anhydrous methanol, add 10mg / mLAuCl 3 ·HCl·4H 2 O stock solution 628 μL, first make the Au by magnetic stirring for two hours in the dark 3+ with TiO 2 Full contact....

Embodiment 2

[0042] 1. Photocatalyst g-C 3 N 4 / Au / TiO 2 preparation of

[0043] (1) g-C 3 N 4 Preparation: Precursor pyrolysis polymerization method is adopted. Weigh 2g of dicyandiamide into a covered crucible, first raise it from room temperature to 500°C at a rate of 10°C / min in the muffle furnace, and keep the temperature constant for 2 hours; then raise it to 520°C at a rate of 5°C / min ℃, constant temperature 2h (deammonization process). Allow the system to cool naturally afterwards, and obtain light yellow g-C after grinding 3 N 4 powder.

[0044] (2) Solution preparation: 1gAuCl 3 ·HCl·4H 2 O was dissolved in 100 mL deionized water to make 10 mg / mL AuCl 3 ·HCl·4H 2 O stock solution.

[0045] (3) Au / TiO 2 Preparation: using photoreduction deposition method. 0.3gTiO 2 Add 60mL deionized water and 15mL anhydrous methanol, add 10mg / mLAuCl 3 ·HCl·4H 2 O stock solution 628 μL, first make the Au by magnetic stirring for two hours in the dark 3+ with TiO 2 Full contact....

Embodiment 3

[0048] 1. Photocatalyst g-C 3 N 4 / Au / TiO 2 preparation of

[0049] (1) g-C 3 N 4 Preparation: Precursor pyrolysis polymerization method is adopted. Weigh 4g of dicyandiamide into a covered crucible, first raise it from room temperature to 500°C at a rate of 10°C / min in the muffle furnace, and keep the temperature constant for 2 hours; then raise it to 520°C at a rate of 5°C / min ℃, constant temperature 2h (deammonization process). Allow the system to cool naturally afterwards, and obtain light yellow g-C after grinding 3 N 4 powder.

[0050] (2) Solution preparation: 1gAuCl 3 ·HCl·4H 2 O was dissolved in 100 mL deionized water to make 10 mg / mL AuCl 3 ·HCl·4H 2 O stock solution.

[0051] (3) Au / TiO 2 Preparation: using photoreduction deposition method. 0.3gTiO 2 Add 60mL deionized water and 15mL anhydrous methanol, add 10mg / mLAuCl 3 ·HCl·4H 2 O stock solution 628 μL, first make the Au by magnetic stirring for two hours in the dark 3+ with TiO 2 Full contact....

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Abstract

The invention relates to the fields of material preparation and photocatalysis, and aims at providing a preparation method of a highly visible light electron transfer g-C3N4/Au/TiO2 Z type photocatalyst. The method comprises the steps: preparing g-C3N4 by a precursor pyrolysis polymerization method, preparing an AuCl3.HCl.4H2O stock solution, preparing Au/TiO2 and preparing the g-C3N4/Au/TiO2 Z type photocatalyst. In the g-C3N4/Au/TiO2 Z type photocatalyst, firstly, TiO2 is loaded with Au, then the loaded TiO2 and g-C3N4 are calcined to form a whole, and Au is located between TiO2 and g-C3N4. Au is used as an electron transfer body and can promote complete separation of photogenerated electrons and hole pairs; an SPR effect of Au can enhance the response ability of the catalyst on visible light; with synergistic effect of a Z type electron transfer path and the SPR effect of Au, the activity of a photocatalytic reaction can be ultimately improved.

Description

technical field [0001] The invention relates to a high visible photoelectron transfer g-C 3 N 4 / Au / TiO 2 The invention discloses a method for preparing a Z-like photocatalyst, belonging to the field of material preparation and photocatalysis. Background technique [0002] In recent years, China's economy has developed rapidly, but its future development is also facing many huge obstacles, such as environmental pollution and energy shortage. As a low-cost, environmentally friendly, green and pollution-free treatment technology, the development and utilization of environmental photocatalysis technology has received extensive attention. At present, photocatalytic technology is mainly used in: photocatalytic decomposition of water to produce hydrogen, degradation of pollutants in water (degradation of chlorinated hydrocarbons), indoor air purification (degradation of benzene, toluene, TVOC). The technology of photo-splitting water to produce hydrogen relies on photoelectron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/004B01J37/08B01J37/345
Inventor 赵伟荣谢丽红
Owner ZHEJIANG UNIV
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