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Preparation method and application of Pd-Fe/Fe3O4 material

A ferric chloride and carrier technology, applied in the field of environmental protection and environmental restoration, can solve the problems of large grain size, low degradation efficiency and low activity.

Active Publication Date: 2020-12-29
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a kind of Pd-Fe / Fe 3 o 4 The preparation method and application of the material aim to solve the problems of large grain size, low activity and low degradation efficiency of the current Pd-M catalyst

Method used

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  • Preparation method and application of Pd-Fe/Fe3O4 material
  • Preparation method and application of Pd-Fe/Fe3O4 material
  • Preparation method and application of Pd-Fe/Fe3O4 material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 4.0g of ferric chloride hexahydrate and 0.238g of disodium ethylenediaminetetraacetate, and dissolve them in 140mL of ethylene glycol; after stirring for 30min, add 4.2g of anhydrous sodium acetate at one time, and continue stirring for 60min; transfer the mixture Put it into a 200mL reaction kettle, react at 200°C for 10h; centrifuge to separate the product, wash the product and dry it under vacuum at 40°C to obtain Fe 3 o 4 carrier. Its XRD spectrum is as figure 1 As shown, the field emission scanning electron microscope (FE-SEM) picture is as follows figure 2 shown. It can be seen that the Fe prepared in Example 1 3 o 4 The carrier is a sphere with rough surface and relatively uniform size, and the average diameter of the sphere is about 748nm.

Embodiment 2

[0032] The preparation steps of this example are basically the same as those of Example 1, except that the treatment method after adding anhydrous sodium acetate is changed to stirring for 10 minutes, followed by ultrasonic treatment for 30 minutes. Its XRD spectrum is as figure 1 As shown, the field emission scanning electron microscope (FE-SEM) picture is as follows image 3 shown. It can be seen that the Fe prepared in Example 2 3 o 4 The carrier is a sphere with a rough surface and a relatively uniform size. The average diameter of the sphere is about 230 nm, and its dispersibility is obviously better than that of the material prepared without ultrasonic treatment in Example 1.

Embodiment 3

[0034] The preparation steps of this example are basically the same as those of Example 1, except that the treatment method after adding anhydrous sodium acetate is changed to stirring for 10 minutes, followed by ultrasonic treatment for 60 minutes. Its XRD spectrum is as figure 1 As shown, the field emission scanning electron microscope (FE-SEM) picture is as follows image 3 shown. It can be seen that the Fe prepared in Example 3 3 o 4 The carrier mainly appears as a rough surface sphere with an average diameter of about 296 nm. In addition to regular spheres, there are also some non-uniform particles that do not form spheres.

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Abstract

The invention provides a preparation method and application of a Pd-Fe / Fe3O4 material. According to the preparation method of the Pd-Fe / Fe3O4 material, palladium chloride solid insoluble in water is dissolved in a ferric chloride or ferrous chloride solution, palladium ions and iron ions share Cl<-> to form a palladium-iron complex, the palladium-iron complex is adsorbed on a ferroferric oxide carrier after the carrier is added, and then the Pd-Fe / Fe3O4 material is formed through reduction of sodium borohydride. According to the invention, the metals Pd and Fe in the Pd-Fe / Fe3O4 material are tightly combined, Pd distribution is uniform, nitrogen selectivity is high in the reaction process of reducing and removing nitrite, and ammonia nitrogen selectivity is low.

Description

technical field [0001] The invention relates to the field of environmental protection and environmental restoration, in particular to a Pd-Fe / Fe 3 o 4 The preparation method of the material and its application to the catalytic degradation of nitrite, a pollutant in water. Background technique [0002] Nitrite nitrogen is one of the common inorganic nitrogen, which participates in the nitrogen cycle in nature and comes from a wide range of sources. In the food processing industry, nitrite is a common preservative and color retention agent for meat products, and has a certain antibacterial and antiseptic effect. Nitrite can also be used as a bleaching agent for flax or silk, a metal heat treatment agent, a steel corrosion inhibitor, and an antidote for oxide poisoning, etc., and is called industrial salt. [0003] With the development of human society, the amount of nitrogen-containing substances from humans to the natural environment has also increased, resulting in nitrog...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/745B01J35/02B01J35/08C02F1/70C02F101/16
CPCB01J23/8906B01J23/745C02F1/705C02F2101/166B01J35/51B01J35/40
Inventor 方奕文冯燕萍陈本祥陈文斌祝忠泰丁客鑫李伟可
Owner SHANTOU UNIV
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