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Photocatalytic material for efficiently removing high-concentration nitrate through photocatalysis as well as preparation method and application of photocatalytic material

A photocatalytic material, photocatalytic technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Evaluation and other issues to achieve the effect of promoting photocatalytic activity, high reduction catalytic activity, and overcoming competition problems

Active Publication Date: 2020-11-24
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of this material needs to go through a preparation process of more than 96 hours, and the preparation process is extremely cumbersome. Although it has a good removal effect on nitrate, it has not evaluated the nitrogen selectivity and the stability of the material recycling, which is difficult to be practical. application
[0004] The invention application with the patent application number 201610891842 discloses a method for removing nitrate nitrogen from water by photocatalytic reduction. The invention discloses an Ag-Ag 2 O / TiO 2 The composite photocatalyst can perform photocatalytic denitrification and denitrification when formic acid is used as a sacrificial agent. However, the catalytic effect of this catalyst in the face of high concentration of nitrate has not been evaluated, and Ag It is easy to react with Cl- to form silver chloride and be inactivated
[0005] The invention application with the patent application number 201910126461.6 discloses a nitride-based catalyst for highly efficient photocatalytic reduction of nitrate in water and a water treatment method thereof. The invention discloses a kind of chemical formula X x N y Covalent nitrogen compounds, although it has a high removal rate for nitrate, but its nitrogen selectivity is low, only less than 50%, which greatly limits its application
[0006] In summary, the current single titanium dioxide-based photocatalysts have problems such as low reduction and removal of nitrate nitrogen and poor selectivity, while modified pertitanium dioxide generally has problems such as low reduction efficiency of high-concentration nitrate and poor stability in complex systems.

Method used

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  • Photocatalytic material for efficiently removing high-concentration nitrate through photocatalysis as well as preparation method and application of photocatalytic material
  • Photocatalytic material for efficiently removing high-concentration nitrate through photocatalysis as well as preparation method and application of photocatalytic material
  • Photocatalytic material for efficiently removing high-concentration nitrate through photocatalysis as well as preparation method and application of photocatalytic material

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Embodiment 1

[0044] This embodiment provides a method for preparing a photocatalytic material for highly efficient photocatalytic removal of high-concentration nitrate, including the following steps:

[0045] Step 1, prepare citrate-stabilized silver nanoparticles: 8mL 40mmol L -1 Sodium citrate solution as a stabilizer was added to 100mL 1mmol L -1 in the silver nitrate solution. 2ml 112mmol·L at room temperature -1 NaBH 4 Add the solution dropwise to the above mixture and stir vigorously (1000-1400rpm) to obtain a yellow-brown silver nanoparticle sol solution. Store the obtained silver sol in a refrigerator at 4°C and let it stand for 24 hours to decompose the remaining NaBH 4 , for subsequent use.

[0046] Step 2. Synthesis and functional modification of SiO 2 : Add 0.6ml of tetraethyl silicate dropwise to a mixed solution of 25mL of water, 15mL of ammonia water and 60mL of isopropanol. The reaction was continued for 30 min with vigorous stirring (1000-1400 rpm) in a 35 °C water ...

Embodiment 2

[0057] This embodiment provides a method for preparing a photocatalytic material for highly efficient photocatalytic removal of high-concentration nitrate, including the following steps:

[0058] Step 1, prepare citrate-stabilized silver nanoparticles: 8mL 40mmol L -1 Sodium citrate solution as a stabilizer was added to 100mL 1mmol L -1 in the silver nitrate solution. 2ml 112mmol·L at room temperature -1 NaBH 4 Add the solution dropwise to the above mixture and stir vigorously (1000-1400rpm) to obtain a yellow-brown silver nanoparticle sol solution. Store the obtained silver sol in a refrigerator at 4°C and let it stand for 24 hours to decompose the remaining NaBH 4 , for subsequent use.

[0059] Step 2. Synthesis and functional modification of SiO 2 : Add 0.6ml of tetraethyl silicate dropwise to a mixed solution of 25mL of water, 15mL of ammonia water and 60mL of isopropanol. The reaction was continued for 30 min with vigorous stirring (1000-1400 rpm) in a 35 °C water ...

Embodiment 3

[0067] This embodiment provides a method for preparing a photocatalytic material for highly efficient photocatalytic removal of high-concentration nitrate, including the following steps:

[0068] Step 1, prepare citrate-stabilized silver nanoparticles: 8mL 40mmol L -1 Sodium citrate solution as a stabilizer was added to 100mL 1mmol L -1 in the silver nitrate solution. 2ml 112mmol·L at room temperature -1 NaBH 4 Add the solution dropwise to the above mixture and stir vigorously (1000-1400rpm) to obtain a yellow-brown silver nanoparticle sol solution. Store the obtained silver sol in a refrigerator at 4°C and let it stand for 24 hours to decompose the remaining NaBH 4 , for subsequent use.

[0069] Step 2. Synthesis and functional modification of SiO 2 : Add 0.6ml of tetraethyl silicate dropwise to a mixed solution of 25mL of water, 15mL of ammonia water and 60mL of isopropanol. The reaction was continued for 30 min with vigorous stirring (1000-1400 rpm) in a 35 °C water ...

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Abstract

The invention discloses a photocatalytic material for efficiently removing high-concentration nitrate through photocatalysis as well as a preparation method and application of the photocatalytic material. The preparation method comprises the following steps: step 1, preparing citrate stabilized silver nanoparticles; step 2, synthesizing and functionally modifying SiO2; step 3, preparing Ag / SiO2; and step 4, preparing an Ag / SiO2@cTiO2 core-shell structure. The photocatalytic material prepared by the method is high in reduction catalytic activity, high-concentration nitrate can be quickly removed, and relatively high nitrogen selectivity is achieved. Meanwhile, due to the protection of a titanium dioxide shell, the material has relatively high stability, and high-concentration nitrate in water can be removed under the condition that high-concentration chloride ions coexist.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and relates to a photocatalytic material, in particular to a photocatalytic material for highly efficient photocatalytic removal of high-concentration nitrate, a preparation method and application thereof. Background technique [0002] Due to the burning of more and more fossil fuels, the continuous increase in the demand for nitrogenous raw materials in industry and agriculture, and the general inefficiency of use, a large amount of nitrate from human activities has been lost into water bodies and has become one of the most abundant pollutants in surface and groundwater. One, causing a series of environmental and human health problems. Countries and organizations all over the world have set strict upper limits on the concentration of nitrate in drinking water. As a relatively new environment-friendly technology, photocatalytic denitrification has become a research hotspot for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J37/10C02F1/30C02F101/16
CPCB01J23/50B01J37/10C02F1/30C02F2305/10C02F2101/163B01J35/39B01J21/063B01J37/16B01J37/0211B01J37/0209B01J37/0207B01J37/0221C02F2305/08C02F1/70B01J35/30B01J35/23
Inventor 王津南候志昂储江峰刘聪
Owner NANJING UNIV
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