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Efficient composite photocatalyst as well as preparation method and application thereof

A catalyst and composite light technology, applied in the field of photocatalyst, can solve the problems of insufficient co-catalyst activity, high interfacial charge transfer barrier, large bending of semiconductor energy band, etc., to achieve fast and smooth charge separation, low energy transfer, Limit the effect of small

Pending Publication Date: 2021-09-21
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the work function (5.65eV) of Pt is different from the electron affinity χ of the above-mentioned common semiconductors. s Larger difference (TiO 2 , CdS, g-C 3 N 4 Semiconductor χ s 4.21eV, 3.98eV, and 3.2eV), therefore, when Pt is in contact with the above photocatalytic semiconductors, the energy band of the semiconductor is bent greatly, which will form a higher interfacial charge transfer barrier
In this way, when the photogenerated electrons are transferred from the semiconductor to the cocatalyst, such as Pt, a large amount of energy needs to be consumed to overcome the potential barrier formed by the bending of the energy band, resulting in a decrease in the hydrogen production efficiency and a situation where the activity of the cocatalyst cannot be fully displayed.

Method used

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  • Efficient composite photocatalyst as well as preparation method and application thereof
  • Efficient composite photocatalyst as well as preparation method and application thereof
  • Efficient composite photocatalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0030] TIO 2 Preparation (Reference: zhijian Wang, Nannan Xue, Jiazang Chen, Semiconductor-Cocatalyst Interfacial Electron Transfer DominatesPhotocatalytic Reaction, J. Phys.Chem. C, 2019, 40, 24404-24408);

[0031] Preparation of CDS (Reference: Guo Liangliang, CDS Morphology Regulation and CDS / MOS 2 Study on Photoelectric Catalytic Performance of Composite Catalyst, Master's Thesis, 2014;

[0032] G-C 3 N 4 Preparation (Reference: Wang Qi, the preparation of carbon dots and compound G-C 3 N 4 Study on Photocatalytic Hydrogenation Performance, Master of Master of Zhengzhou University, 2019).

[0033] The reagents or instruments used are not indicated by the manufacturer, all of which can be obtained through commercially available purchase.

Embodiment 1

[0034] Example 1 (1% PT / 2% Ag / CDS NR)

[0035] A method of preparing a highly efficient composite optical catalyst, wherein the preparation method is as follows:

[0036] (1) Preparation of CDS NR (CDS Nano): Cadmium nitrate and thiourea are dispersed in ethylenediamine in a molar ratio of 1: 3, and the solvent heat is 160 ° C for 24 h, which is CDS NR;

[0037] (2) Preparation of 2% Ag / CDS NR: CDS NR (200 mg) obtained in step (1) is sufficiently dispersed in a mixed solution of 180 ml of distilled water and 20 ml of methanol, then adding 6.3 mg AgNO. 3 The aqueous solution is thoroughly stirred, and the pH of the suspension is 6.0, followed by an inert gas in rapid stirring, and then irradiated with a 300 W high pressure mercury lamp to obtain a mixture to be treated;

[0038] (3) Preparation of 1% PT / 2% Ag / CDS NR: 4.2 mg h 2 PTCL 6 The aqueous solution was added to the mixture to be treated in step (2), continued with a 300 W high-pressure mercury lamp for 1 h, and the...

Embodiment 2

[0042] Example 2 (1% PT / 0.5% Ag / TiO 2 NP)

[0043] A method of preparing a highly efficient composite optical catalyst, wherein the preparation method is as follows:

[0044] (1) Rate TiO TIO 2 NP (Tio 2 Preparation of nanoparticles: 10 ml of titanate and 2 ml of triethylamine were mixed into 60 ml of water, stirred well, 220 ° C, water and heat at 24 h, centrifugally, wash, dried, 500 ° C calcined 1.5 h, ie TiO 2 NP;

[0045] (2) 0.5% AG / TIO 2 NP preparation: TIO from step (1) 2 Np (100 mg) is fully dispersed in a mixed solution of 150 ml of distilled water and 150 mL of ethanol, then adding 0.8 mg of AgNO. 3 The aqueous solution was thoroughly stirred and the pH of the suspension was 5.5, followed by an inert gas in rapid stirring, and was irradiated with a 300 W high pressure mercury lamp to obtain a mixture to be treated;

[0046] (3) 1% PT / 0.5% AG / TIO 2 NP preparation: will contain 2.1 mg h 2 PTCL 6 The aqueous solution was added to the mixture to be treated in step...

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Abstract

The invention discloses a preparation method of an efficient composite photocatalyst. The method comprises the following steps: dispersing a certain amount of semiconductor catalyst in a solvent, then adding an AgNO3 solution or a PbCl2 solution, performing illumination reaction to obtain an Ag / semiconductor or a Pb / semiconductor, then adding an H2PtCl6 solution, performing illumination reaction again, and after the reaction is completed, performing separating, washing and drying to obtain a Pt / Ag or a Pt / Pb semiconductor catalyst. The Pt / Ag / semiconductor catalyst and the Pt / Pb / semiconductor catalyst are prepared by adopting a two-step photodeposition method, and nano Ag or Pb particles are ensured to play a bridge role between the semiconductor catalyst and a promoter Pt, so that the photocatalytic hydrogen production effect is improved. The high-efficiency composite photocatalyst prepared by the invention has the remarkable characteristics of high stability, high catalytic efficiency and the like, and has a wide application prospect.

Description

Technical field [0001] The present invention belongs to the technical field of optical removal, and more particularly to a high-efficiency composite photocatalyst and a preparation method thereof. Background technique [0002] Studies have found that the oxidation of organic small molecule selectively oxidative replacement water (oxygen) can be solved in the process of photolysis of water, which can solve the resolution of the oxidative semi-reactivity to the entire reaction rate. Thus, the rate of photocatalytic reactions of this type depends primarily on the reduction semi-response. Typically, the reduction semi-reaction process mainly includes emitting electron transfer from the semiconductor to the cocatalyst, and the electron is reduced to the cocatalyst, however, due to the existence of the contact barrier, since the dynamics limits the light electron from the semiconductor photocatalyst to the reduction The transfer of the cocatalyst has restricted the occurrence of photoc...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J23/50B01J23/62B01J37/34C01B3/04
CPCB01J27/04B01J23/50B01J23/628B01J37/344C01B3/042B01J35/393B01J35/23B01J35/39Y02E60/36
Inventor 陈加藏王志坚向后奎
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI