A silver/strontium titanate-g-carbon nitride heterojunction photocatalyst and its preparation method

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

Active Publication Date: 2021-01-29
CHANGZHOU XINHONG PHARMA & CHEM IND TECHOLOGIES
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  • Summary
  • 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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  • A silver/strontium titanate-g-carbon nitride heterojunction photocatalyst and its preparation method
  • A silver/strontium titanate-g-carbon nitride heterojunction photocatalyst and its preparation method
  • A silver/strontium titanate-g-carbon nitride heterojunction photocatalyst and its preparation method

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Experimental program
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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 heterojunction photocatalyst and a preparation method thereof. The method comprises the following steps: using Sr(NO 3 ) 2 , n-butyl titanate and AgNO 3 As a precursor, Ag / SrTiO was prepared by sol-hydrothermal method 3 catalyst; the resulting Ag / SrTiO 3 Calcined with melamine in a tube furnace to obtain Ag / SrTiO 3 / g‑C 3 N 4 ; The resulting Ag / SrTiO 3 / g‑C 3 N 4 React under the action of dehydrating agent to get Ag / SrTiO 3 –g‑C 3 N 4 Heterojunction photocatalyst, the present invention constructs g-C 3 N 4 with SrTiO 3 Inter-Ti‑N chemical bonding and Ag loading on SrTiO 3 surface, facilitating photogenerated electrons from g‑C 3 N 4 To SrTiO 3 Surface migration, and then migration to the Ag surface, effectively inhibits the recombination of photogenerated electrons and holes. In addition, the preparation method of the present invention has easy-to-obtain raw materials, mild reaction conditions and no pollution to the environment, and has good application prospects.

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 Patents(China)
IPC IPC(8): B01J27/24C02F1/30
CPCB01J27/24B01J35/004C02F1/30C02F2305/10
Inventor 傅小飞高永
Owner CHANGZHOU XINHONG PHARMA & CHEM IND TECHOLOGIES
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