A photocatalytic material for highly efficient photocatalytic removal of high-concentration nitrate, its preparation method and application

A photocatalytic material and photocatalytic technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of nitrogen selective stability evaluation, low nitrate reduction efficiency, and ineffective catalytic effect Evaluation and other issues to achieve the effect of promoting photocatalytic activity, high reduction catalytic activity, and overcoming competition issues

Active Publication Date: 2021-10-08
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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  • A photocatalytic material for highly efficient photocatalytic removal of high-concentration nitrate, its preparation method and application
  • A photocatalytic material for highly efficient photocatalytic removal of high-concentration nitrate, its preparation method and application
  • A photocatalytic material for highly efficient photocatalytic removal of high-concentration nitrate, its preparation method and application

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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 highly efficient photocatalytic removal of high-concentration nitrate and its preparation method and application. The preparation method includes the following steps: Step 1, preparing citrate-stabilized silver nanoparticles; Step 2, synthesizing and Functionalized modified SiO 2 ; Step three, preparation of Ag / SiO 2 ; Step 4, preparation of Ag / SiO 2 @cTiO 2 Core-shell structure. The photocatalytic material prepared by the invention has high reduction catalytic activity, can quickly remove high-concentration nitrate and achieve higher nitrogen selectivity. At the same time, due to the protection of the titanium dioxide shell, this material has good stability and can remove high-concentration nitrate in water under the condition of coexistence of high-concentration chloride ions.

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 Patents(China)
IPC IPC(8): B01J23/50B01J37/10C02F1/30C02F101/16
CPCB01J23/50B01J35/004B01J37/10C02F1/30C02F2305/10C02F2101/163
Inventor 王津南候志昂储江峰刘聪
Owner NANJING UNIV
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