Preparation method of Ag2S/TiO2 composite photocatalyst and application thereof

A catalyst and composite light technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of unfavorable preparation methods and many kinds of raw materials, so as to simplify the preparation process, reduce the kinds of raw materials, The effect of preventing the loss of effective ions

Active Publication Date: 2019-08-30
CHAOHU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inventive method overcomes Ag 2 S / TiO 2 In the preparation process of composite photocatalyst, there are many kinds of raw materials and the preparation method is not conducive to industrial production. The main raw material is metatitanic acid, which has a wide range of sources, low price and contains sulfur impurities, and is prepared by sol-gel method combined with heat treatment technology to obtain performance. Excellent Ag 2 S / TiO 2 composite photocatalyst

Method used

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  • Preparation method of Ag2S/TiO2 composite photocatalyst and application thereof
  • Preparation method of Ag2S/TiO2 composite photocatalyst and application thereof
  • Preparation method of Ag2S/TiO2 composite photocatalyst and application thereof

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preparation example Construction

[0036] Ag of the present invention 2 S / TiO 2 The preparation method of the composite photocatalyst uses metatitanic acid and silver nitrate as raw materials, citric acid as a complexing agent for silver ions, and adopts sol-gel technology combined with a heat treatment process to prepare Ag 2 S / TiO 2 Composite photocatalyst; Concretely comprises the following steps:

[0037] Step 1: Mix silver nitrate, citric acid and deionized water evenly to obtain a mixed solution;

[0038] Step 2: Slowly add ammonia water dropwise to the mixed solution obtained in step 1, and stir to obtain a sol;

[0039] Step 3: Mix the sol obtained in Step 2 with metatitanic acid, disperse it ultrasonically, stir it magnetically, and then heat it in a water bath. After the system loses fluidity, dry it in a blast drying oven to obtain a precursor;

[0040] Step 4: heat-treat the precursor obtained in step 3 in a tube furnace under nitrogen flow protection to obtain Ag 2 S / TiO 2 composite photocata...

Embodiment 1

[0051] 1. Mix 0.3404g silver nitrate, 0.4224g citric acid and 20mL deionized water evenly to obtain a mixed solution;

[0052] 2. Slowly add ammonia water dropwise while stirring in the above mixed solution, and adjust the pH value of the mixed solution to 8-9 to obtain a sol;

[0053] 3. Add 1.7978g of metatitanic acid to the above sol, ultrasonically disperse it for 10-15min, then stir it magnetically for 20-30min, then heat it in a water bath at 80-90°C, and put it in a blast drying oven after the system loses its fluidity Dry at 120°C for 12 hours to obtain the precursor;

[0054] 4. Put the above precursor into a tube furnace, under the protection condition of nitrogen flow, first raise the temperature to 300°C at a rate of 6°C / min, keep it warm for 10 minutes, and then raise the temperature to 400°C at a rate of 2°C / min ℃, hold for 120min, and finally cool down with the furnace to obtain Ag 2 S / TiO 2 composite photocatalyst.

Embodiment 2

[0056] 1. Mix 0.3404g silver nitrate, 0.5069g citric acid and 20mL deionized water evenly to obtain a mixed solution;

[0057] 2. Slowly add ammonia water dropwise while stirring in the above mixed solution, and adjust the pH value of the mixed solution to 8-9 to obtain a sol;

[0058] 3. Add 1.7978g of metatitanic acid to the above sol, ultrasonically disperse it for 10-15min, then stir it magnetically for 20-30min, then heat it in a water bath at 80-90°C, and put it in a blast drying oven after the system loses its fluidity Dry at 120°C for 12 hours to obtain the precursor;

[0059] 4. Put the above precursor into a tube furnace, under the protection condition of nitrogen flow, first raise the temperature to 300°C at a rate of 6°C / min, keep it warm for 10 minutes, and then raise the temperature to 400°C at a rate of 2°C / min ℃, hold for 120min, and finally cool down with the furnace to obtain Ag 2 S / TiO 2 composite photocatalyst.

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Abstract

The invention discloses a preparation method of an Ag2S / TiO2 composite photocatalyst and application thereof. According to the preparation method, with metatitanic acid and silver nitrate as raw materials and citric acid as a complexing agent for silver ions, the Ag2S / TiO2 composite photocatalyst is prepared by a sol-gel technology in combination with a thermal treatment technology. The preparation method of the composite photocatalyst is simple, the raw material cost is low, and the synthesized photocatalyst has very good visible light responsiveness. Data in the embodiment show that the Ag2S / TiO2 photocatalyst provided by the invention has a degradation rate of 98% for an aqueous methylene blue solution with the concentration of 50mg / L when the catalyst content is 1mg / mL and simulated sunlight irradiation lasts for 60min, so that the Ag2S / TiO2 photocatalyst can be widely applied to photocatalytic degradation of organic pollutants.

Description

technical field [0001] The present invention relates to the preparation method and application of a kind of composite photocatalyst, specifically a kind of Ag 2 S / TiO 2 The preparation method and application of a composite photocatalyst belong to the technical field of photocatalytic semiconductor material preparation. Background technique [0002] In recent years, with the rapid development of industry and agriculture, a large number of toxic and harmful substances such as heavy metal ions, pesticides, dyes, etc. have been discharged into the water, polluting the water environment, and causing serious threats and harm to human production, life and health. Therefore, how to remove pollutants in water has become the focus of attention in recent years. [0003] Advanced Oxidation Processes (AOPs) is currently the most widely used and most promising water treatment technology, which is based on the in-situ generation of H 2 o 2 ,·OH,·O 2- and O 2 Highly active transient s...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J37/08B01J37/34C02F1/30C02F101/30
CPCB01J27/04B01J37/082B01J37/343C02F1/30C02F2305/10C02F2101/308B01J35/39
Inventor 李明玲高华敏王小东李雷张扬李宏林
Owner CHAOHU UNIV
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