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Preparation method of high-activity hollow composite photocatalyst Ag/Au/AgCl

A technology of composite light and catalyst, applied in the field of catalysis, to achieve the effect of improved photocatalytic performance, easy operation and short reaction time

Active Publication Date: 2018-07-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, a small number of reports have shown that gold-silver alloys can effectively improve the photocatalytic activity of semiconductors, but there is no report on the coupling of Ag / Au and AgCl semiconductors to improve the catalytic activity of AgCl semiconductors.

Method used

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  • Preparation method of high-activity hollow composite photocatalyst Ag/Au/AgCl
  • Preparation method of high-activity hollow composite photocatalyst Ag/Au/AgCl
  • Preparation method of high-activity hollow composite photocatalyst Ag/Au/AgCl

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Step 1, preparation of Ag nanowires: weigh 0.1699gAgNO 3 Add the powder into 10mL of ethylene glycol, ultrasonically disperse and stir in a water bath at 30°C, then dissolve 0.1669g of polyvinylpyrrolidone (PVP, M W =10000, molar mass M=111g / mol) and 0.0019gCuCl 2 2H 2 O (PVP concentration is 0.15mol / L, CuCl 2 Concentration is 1mmol / L), after fully dissolved, mix AgNO 3 Solution and PVP solution, and put the mixed solution into a 50mL polytetrafluoroethylene liner reactor to react at 140°C for 3 hours; then centrifuge the completed solution to collect it, and wash it three times alternately with ethanol and water above, and then place it in a vacuum oven at 50°C for 10 hours to dry.

[0042] Step 2, the preparation of Ag / Au / AgCl series hollow composite catalyst: take 15mg by weighing the Ag nanowire that step 1 makes and add in 10mL dehydrated alcohol, then add 20mgPVP (M W =58000) powder, after stirring at 30°C to fully dissolve, add 0.5mL HAuCl dropwise 4 soluti...

Embodiment 2

[0049] Step 1, the preparation of Ag nanowires, the preparation method is the same as in Example 1;

[0050] Step 2, preparation of Ag / Au / AgCl string-shaped hollow composite photocatalyst: Weigh 15 mg of Ag nanowires prepared in step 1 and add them to 10 mL of absolute ethanol, then add 20 mg of PVP (Mw=58000) powder, at 30 ° C After stirring fully to dissolve, add 1.0mL HAuCl dropwise 4 solution (0.2mM), the solution continued to react at 30°C for 10 hours; the completed solution was centrifuged, washed alternately with ethanol and water for more than 3 times, and then the obtained precipitate was dried in a vacuum oven at 50°C for 10 hours, Obtain Ag / Au / AgCl series hollow composite photocatalyst. In the obtained product, the molar ratio of Ag, Au and AgCl is 8:2:6.

[0051] Under the same photocatalytic conditions as in the photocatalytic experiment of Example 1, the photocatalyst prepared in Example 2 can degrade 93.6% of AO7 within 3 minutes.

Embodiment 3

[0053] Step 1, the preparation of Ag nanowires, the preparation method is the same as in Example 1;

[0054] Step 2, the preparation of Ag / Au / AgCl string hollow composite photocatalyst: take 15mg by weighing the Ag nano wire that makes by step 1 and add in 10mL dehydrated alcohol, then add 20mgPVP (M W =58000) powder, after stirring at 30°C to fully dissolve, add 1.5mL HAuCl dropwise 4 solution (0.2mM), the solution continued to react at 30°C for 10 hours; the completed solution was centrifuged, washed alternately with ethanol and water for more than 3 times, and then the obtained precipitate was dried in a vacuum oven at 50°C for 10 hours, Obtain Ag / Au / AgCl series hollow composite photocatalyst. In the obtained product, the molar ratio of Ag, Au and AgCl is 5:3:9.

[0055] Under the same photocatalytic conditions as in the photocatalytic experiment of Example 1, the photocatalyst prepared in Example 3 can degrade 92.9% of AO7 within 3 minutes.

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Abstract

The invention aims to provide a preparation method of a high-activity hollow composite photocatalyst Ag / Au / AgCl. The method comprises the following steps: firstly, 1D Ag nanowires with uniform morphology and good performance are prepared with a hydrothermal method; then the Ag nanowires are coated with AgCl particles through galvanic replacement, and an Au / Ag alloy is formed synchronously; finally, morphology and performance of an Ag / Au / AgCl hollow composite structure are controlled by controlling concentration of chloroauric acid and regulating redox reaction rate, and the high-activity hollow composite photocatalyst Ag / Au / AgCl is obtained. The efficient composite photocatalyst based on Au and Ag is prepared with the method, composition of a semiconductor and precious metal is realized, and the method is conducted under quite mild conditions, reaction time is short, operation is simple and convenient, and the method can be applied to preparation and application of various nanocomposites.

Description

technical field [0001] The invention relates to a preparation method of a high-activity hollow composite photocatalyst Ag / Au / AgCl, belonging to the technical field of catalysis. Background technique [0002] Water pollution caused by organic pollutants has become an important problem in the world today, and the photocatalytic application of semiconductor materials is a good way to solve environmental pollution. As a light-sensitive semiconductor material, AgCl has been introduced into the field of photocatalysis in recent years, especially after being combined with metal Ag, it can significantly improve the utilization rate of visible light. Because metal Ag absorbs visible light, the localized surface plasmon resonance (LSPR) effect can promote the semiconductor to generate more carriers, and also provide a good carrier for the carrier separation of the semiconductor, while improving the stability of the AgCl semiconductor. Based on these advantages, Ag and AgCl composite ...

Claims

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Application Information

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IPC IPC(8): B01J27/10B01J35/06B01J37/03B01J37/10B01J37/16
CPCB01J27/10B01J37/031B01J37/10B01J37/16B01J35/58B01J35/39
Inventor 吴伟刘军
Owner WUHAN UNIV
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