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Preparation method and application of photocatalyst for selectively reducing nitrate into N2

A technology of photocatalyst and nitrate, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc. Catalytic activity, effect of large specific surface area

Active Publication Date: 2021-10-01
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Purpose of the present invention is exactly for the above-mentioned defective that prior art exists, and a kind of selective reduction nitrate is provided as N 2 The preparation method and application of the photocatalyst, the curd-shaped heterojunction photocatalyst prepared by the present invention overcomes the shortcomings of the traditional photocatalyst photogenerated carriers that are easy to recombine and easily produce secondary pollutants, and has stable chemical properties, low cost, and reduction High catalytic activity, N 2 Good selectivity and other characteristics, can selectively convert nitrate into non-toxic and harmless N 2 , so as to realize the treatment of nitrate pollutants in wastewater cost-effectively and environmentally friendly

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  • Preparation method and application of photocatalyst for selectively reducing nitrate into N2
  • Preparation method and application of photocatalyst for selectively reducing nitrate into N2
  • Preparation method and application of photocatalyst for selectively reducing nitrate into N2

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The invention provides a selective reduction of nitrate to N 2 The photocatalyst preparation method comprises the steps:

[0036] Step (1): preparation of heterojunction photocatalyst;

[0037] NH 2 -MIL-101(Fe) preparation: 6 mmol FeCl 3 ·6H 2 O was dissolved in 72 mL of N,N-dimethylformamide solution, and then 3 mmol of 2-aminoterephthalic acid was added, and ultrasonicated for 20 min until the 2-aminoterephthalic acid was completely dissolved. The solution was transferred to a 120 mL polytetrafluoroethylene reactor and heated at 110 °C for 20 h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the crude product was separated by pressure release and filtration. The crude product was washed and centrifuged several times with N, N-dimethylformamide solution and absolute ethanol solution to obtain the final product. The final product was purified in a blast drying oven at 150 °C for 8 h. The obtained dark brown powder is NH 2 ...

Embodiment 2

[0050] The difference between this embodiment and embodiment 1 is: the photocatalyst prepared in the step (1) is NH 2 -MIL-101(Fe) added with 5%, 10% and 15% NH 2 -MIL-101(Fe) / BiVO 4 heterojunction photocatalysts.

[0051] Step (1): NH 2 -MIL-101(Fe) / BiVO 4 Preparation of heterojunction photocatalysts;

[0052] NH 2 -MIL-101(Fe) preparation: 6 mmol FeCl 3 ·6H 2 O was dissolved in 72 mL of N,N-dimethylformamide solution, and then 3 mmol of 2-aminoterephthalic acid was added, and ultrasonicated for 20 min until the 2-aminoterephthalic acid was completely dissolved. The solution was transferred to a 120 mL polytetrafluoroethylene reactor and heated at 110 °C for 20 h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the crude product was separated by pressure release and filtration. The crude product was washed and centrifuged several times with N, N-dimethylformamide solution and absolute ethanol solution to obtain the final product....

Embodiment 3

[0060] The difference between this example and Example 1 is that the hole trapping agents used in step (2) are 80 mmol / L formic acid, methanol, and oxalic acid, respectively.

[0061] Step (1): preparation of heterojunction photocatalyst;

[0062] NH 2 -MIL-101(Fe) preparation: 6 mmol FeCl 3 ·6H 2 O was dissolved in 72mL of N,N-dimethylformamide solution, and then 3 mmol of 2-aminoterephthalic acid was added, and ultrasonicated for 20 min until the 2-aminoterephthalic acid was completely dissolved. The solution was transferred to a 120 mL polytetrafluoroethylene reactor and heated at 110 °C for 20 h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the crude product was separated by pressure release and filtration. The crude product was washed and centrifuged several times with N, N-dimethylformamide solution and absolute ethanol solution to obtain the final product. The final product was purified in a blast drying oven at 150 °C for 8...

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Abstract

The invention discloses a preparation method and application of a photocatalyst for selectively reducing nitrate into N2. According to the technical scheme, the preparation method of the photocatalyst comprises the following steps: step 1, preparing NH2-MIL-101 (Fe) porous octahedral nanoparticles by adopting a solvothermal method; and step 2, preparing the NH2-MIL-101 (Fe) / BiVO4 flower-ball-shaped heterojunction photocatalyst by a hydrothermal synthesis method. The photocatalyst is used for efficiently and selectively performing photocatalytic reduction on nitrate in a water body into nitrogen. The beneficial effects are that the prepared photocatalyst overcomes the defects that photon-generated carriers of a traditional photocatalyst are easy to compound and secondary pollutants are easy to generate, has the characteristics of stable chemical property, low cost, high reduction catalytic activity, good N2 selectivity and the like, can selectively convert nitrate into non-toxic and harmless N2, and thus the treatment of the nitrate pollutants in the wastewater is realized economically, efficiently and environmentally friendly.

Description

technical field [0001] The invention relates to a preparation method and application of a photocatalyst for removing nitrate in waste water, in particular to a method for selectively reducing nitrate to N 2 Photocatalyst preparation method and application. Background technique [0002] With the rapid development of economic globalization and the increasingly close trade links between countries in the world, the volume of cargo transportation between countries has continued to increase in recent years. At present, ship transportation has undertaken more than two-thirds of the global cargo transportation with a lower cost advantage. In the future, ship transportation will still be the most important way of cargo transportation between countries. While ship transportation brings us great convenience, it also inevitably causes various impacts on the environment. Among them, the emission of NOx pollutants in ship flue gas has attracted increasing attention. The International Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J23/22B01J35/08B01J37/10C02F1/32C02F1/70C02F101/16
CPCB01J31/1691B01J23/22B01J23/002B01J37/10C02F1/32C02F1/70B01J2531/842B01J2531/0213C02F2305/10C02F2101/163B01J35/23B01J35/51B01J35/39
Inventor 李春虎石会龙王亮王文泰李子真
Owner OCEAN UNIV OF CHINA
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