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Silver/strontium titanate-g-carbon nitride heterogeneous photocatalyst and preparation method thereof

A photocatalyst, strontium titanate technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of complex preparation process, easy recombination of photogenerated electrons and holes, and low photon quantum efficiency. , to achieve the effect of easy availability of raw materials, high practical value and application prospects, and inhibition of compounding

Active Publication Date: 2018-06-26
CHANGZHOU XINHONG PHARMA & CHEM IND TECHOLOGIES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of photocatalysts in the prior art that photogenerated electrons and holes are easy to recombine in the catalytic reaction, the photon quantum efficiency is low, and the preparation process is complicated. The present invention provides a silver / strontium titanate-g-carbon nitride Heterojunction photocatalyst and preparation method thereof, by constructing g-C 3 N 4 with SrTiO 3 Inter-Ti-N chemical bonding and Ag-supported SrTiO 3 The surface, in the photocatalytic reaction, promotes the separation of photogenerated electrons and holes, and at the same time forms a new reactive site centered on Ag, which is of great significance for the improvement of the photocatalytic activity of the coupling system and the application of improving the environment.

Method used

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  • Silver/strontium titanate-g-carbon nitride heterogeneous photocatalyst and preparation method thereof
  • Silver/strontium titanate-g-carbon nitride heterogeneous photocatalyst and preparation method thereof
  • Silver/strontium titanate-g-carbon nitride heterogeneous photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] A method for preparing a silver / strontium titanate-g-carbon nitride heterojunction photocatalyst, comprising the steps of:

[0040] Step 1, Preparation of Ag / SrTiO by sol-hydrothermal method 3 Photocatalyst, the specific process is as follows, 2.0g Sr(NO3 ) 2 and 0.02gAgNO 3 Added to 10mL of HNO with a concentration of 0.5mol / L 3 In the solution, ultrasonically disperse for 0.5h to prepare mixed solution A; add 10mL n-butyl titanate to 20mL glycerin solution to prepare mixed solution A; slowly add mixed solution A to mixed solution B while stirring , forming a sol; the sol was moved into a reaction kettle, and the hydrothermal synthesis reaction was carried out at 120°C for 12 hours, and the obtained product was washed and dried to obtain Ag / SrTiO 3 catalyst of light.

[0041] Step 2, 1.0g step 1 made Ag / SrTiO 3 Put 10g of melamine in a tube furnace and calcinate at 300℃ for 3h in the air atmosphere to prepare Ag / SrTiO 3 / g -C 3 N 4 catalyst.

[0042] Step 3, t...

Embodiment 2

[0044] A method for preparing a silver / strontium titanate-g-carbon nitride heterojunction photocatalyst, comprising the steps of:

[0045] Step 1, Preparation of Ag / SrTiO by sol-hydrothermal method 3 Photocatalyst, the specific process is as follows, 2.5g Sr(NO 3 ) 2 and 0.08gAgNO 3 Added to 12mL of HNO with a concentration of 1.0mol / L 3 In the solution, ultrasonically disperse for 0.5h to prepare mixed solution A; add 12mL n-butyl titanate to 20mL glycerol solution to prepare mixed solution A; slowly add mixed solution A to mixed solution B while stirring , forming a sol; the sol was moved into a reaction kettle, and the hydrothermal synthesis reaction was carried out at 140°C for 24 hours, and the obtained product was washed and dried to obtain Ag / SrTiO 3 catalyst of light.

[0046] Step 2, 1.5g step 1 made Ag / SrTiO 3 Put 10g of melamine in a tube furnace and calcinate at 350℃ for 3h in the air atmosphere to prepare Ag / SrTiO 3 / g -C 3 N 4 catalyst.

[0047] Step 3,...

Embodiment 3

[0049] A method for preparing a silver / strontium titanate-g-carbon nitride heterojunction photocatalyst, comprising the steps of:

[0050] Step 1, Preparation of Ag / SrTiO by sol-hydrothermal method 3 Photocatalyst, the specific process is as follows, 2.5g Sr(NO 3 ) 2 and 0.1gAgNO 3 Added to 12mL of HNO with a concentration of 1.0mol / L 3 In the solution, ultrasonically disperse for 0.5h to prepare mixed solution A; add 12mL n-butyl titanate to 20mL glycerol solution to prepare mixed solution A; slowly add mixed solution A to mixed solution B while stirring , forming a sol; the sol was moved into a reaction kettle, and the hydrothermal synthesis reaction was carried out at 160°C for 24 hours, and the obtained product was washed and dried to obtain Ag / SrTiO 3 catalyst of light.

[0051] Step 2, 1.5g step 1 made Ag / SrTiO 3 Put 10g of melamine in a tube furnace and calcinate at 400℃ for 3h in the air atmosphere to prepare Ag / SrTiO 3 / g -C 3 N 4 catalyst.

[0052] Step 3, ...

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Abstract

The invention discloses a silver / strontium titanate-g-carbon nitride heterogeneous photocatalyst and a preparation method thereof. The method comprises the following steps: taking Sr(NO3)2, tetrabutyltitanate and AgNO3 as precursors and preparing a Ag / SrTiO3 catalyst by using a sol-hydrothermal method; putting the obtained Ag / SrTiO3 and melamine into a tube furnace for calcining to obtain Ag / SrTiO3 / g-C3N4; reacting the obtained Ag / SrTiO3 / g-C3N4 under the action of a dehydrating agent to obtain the Ag / SrTiO3 / g-C3N4 heterogeneous photocatalyst. According to the preparation method of the silver / strontium titanate-g-carbon nitride heterogeneous photocatalyst, disclosed by the invention, by means of Ti-N chemical binding between g-C3N4 and SrTiO3 and loading of Ag on the surface of the SrTiO3,the migration of photogenerated electrons from g-C3N4 to SrTiO3 surface is promoted, and thereby the migration of the photogenerated electrons to Ag surface is promoted and the recombination of the photogenerated electrons and holes is effectively inhibited. In addition, the preparation method disclosed by the invention has the advantages of easiness in raw material obtaining, mild reaction conditions, no pollution to the environment and better application prospect.

Description

technical field [0001] The invention relates to the field of preparation of photocatalytic materials, in particular to a silver / strontium titanate-g-carbon nitride heterojunction photocatalyst, and also to a preparation method of the photocatalyst. Background technique [0002] With the rapid increase of the world's population and the rapid development of modern industry, energy shortage and environmental pollution are two major problems facing human society today. As an emerging and green technology, photocatalysis has great potential in solving energy and environmental problems. Strontium titanate (SrTiO 3 ) is a typical perovskite-type photocatalytic material, and its photocatalytic removal of water pollutants is a potential wastewater terminal treatment technology. However, pure SrTiO 3 Photogenerated electrons and holes are easily recombined in the photocatalytic reaction, resulting in low photon quantum efficiency and inhibited photocatalytic activity. Studies have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J27/24C02F2305/10B01J35/39
Inventor 傅小飞高永
Owner CHANGZHOU XINHONG PHARMA & CHEM IND TECHOLOGIES
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