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Modification method of active metal catalyst, and application of modified active metal catalyst

An active metal and catalyst technology, applied in the field of nano-semiconductor composite material preparation, can solve the problems of large Ag particle size, easy agglomeration, easy deactivation, cumbersome and other problems, and achieves the effects of simple modification method, improved catalytic performance and high processing efficiency.

Inactive Publication Date: 2019-11-15
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Ag has defects such as high cost and easy agglomeration, which affect the use of Ag-based catalysts.
In order to solve this problem, Ag nanoparticles are usually supported by carriers, such as CeO 2 @Ag, according to the invention of this disclosure, the existing preparation of CeO 2 The method of @Ag is a chemical precipitation method, which is cumbersome and poor in stability; the Ag particles are large in size and easy to agglomerate and inactivate; it is difficult to ensure that all Ag particles are attached to CeO 2 Surface and other issues

Method used

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  • Modification method of active metal catalyst, and application of modified active metal catalyst
  • Modification method of active metal catalyst, and application of modified active metal catalyst
  • Modification method of active metal catalyst, and application of modified active metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) The nanomaterial CeO 2 Nanorods in 3 mL of 5 mg / mL FeCl 2 Ultrasound in the solution for 30min to make CeO 2 The surface is fully activated.

[0047] (2) Disperse the solution obtained in step (1) in 3 mL of 0.1 mg / mL AgNO 3 solution, aged for 5h and then centrifuged.

[0048] (3) After rinsing the compound obtained in step (2) several times with deionized water, dry it to obtain CeO 2 @Ag nano-semiconductor composite materials, XRD analysis of nano-semiconductor composite materials such as figure 1 As shown, HRTEM with nanosemiconductor composites dispersed in ethanol as figure 2 As shown, after ICP detection, the loading amount of Ag is 5.42wt%.

[0049] (4) will take 15mg CeO respectively 2 Nanorods, CeO 2 Each of the @Ag nanosemiconductor composites was dissolved in 50 mL of methyl orange (5 mg / L) solution.

[0050] (5) Shake the solution in step (4) for 10 min in the dark, so that the photocatalyst-pollutant molecule reaches an adsorption-desorption e...

Embodiment 2

[0053] (1) The nanomaterial CeO 2 Nanorods in 3 mL of 5 mg / mL SnCl 2 Ultrasound in the solution for 30min to make CeO 2 The surface is fully activated.

[0054] (2) Disperse the solution obtained in step (1) in 3 mL of 10 mg / mL AgNO 3 solution, aged for 10 h and then centrifuged.

[0055] (3) After rinsing the compound obtained in step (2) several times with deionized water, dry it to obtain CeO 2 @Ag nano-semiconductor composite material, HRTEM dispersed in ethanol as image 3 shown.

[0056] (4) CeO 2 15 mg of @Ag nano-semiconductor composite materials were dissolved in 50 mL of methyl orange (5 mg / L) solution.

[0057] (5) Shake the solution in step (4) for 10 min in the dark, so that the photocatalyst-pollutant molecule reaches an adsorption-desorption equilibrium in the aqueous solution.

[0058] (6) The solution in step (5) was irradiated under a 200W xenon lamp, and every 20 minutes, centrifuged to take 4 mL of the supernatant and measured the absorbance with a ...

Embodiment 3

[0061] (1) The nanomaterial CeO 2 Nanorods in 3 mL of 8 mg / mL AlCl 3 Ultrasound in the solution for 50min to make CeO 2 The surface is fully activated.

[0062] (2) Disperse the solution obtained in step (1) in 3 mL of 50 mg / mL AgNO 3 solution, aged for 15 hours and then centrifuged.

[0063] (3) After rinsing the compound obtained in step (2) several times with deionized water, dry it to obtain CeO 2 @Ag nano-semiconductor composites.

[0064] (4) CeO 2 15 mg of @Ag nano-semiconductor composite materials were dissolved in 50 mL of methyl orange (5 mg / L) solution.

[0065] (5) Shake the solution in step (4) for 10 min in the dark, so that the photocatalyst-pollutant molecule reaches an adsorption-desorption equilibrium in the aqueous solution.

[0066] (6) The solution in step (5) was irradiated under a 200W xenon lamp, and every 20 minutes, centrifuged to take 4 mL of the supernatant and measured the absorbance with a UV-Vis spectrophotometer.

[0067] In the above (1...

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Abstract

The invention provides a modification method of an active metal catalyst, and an application of a modified active metal catalyst. The modification method comprises the following steps: dispersing CeO2nanoparticles in an activator solution to activate the surface of the CeO2 nanoparticles, adding the activated CeO2 nanoparticles into a silver salt solution, and performing aging to obtain a CeO2 nanoparticle-supported silver nanoparticle catalyst, wherein the activator is SnCl2, FeCl2 or AlCl3. The CeO2@Ag obtained by the modification method makes Ag nanoparticles uniformly adsorbed to the surface of CeO2, and has a good photodegradation efficiency and a good cycle stability.

Description

technical field [0001] The disclosure belongs to the technical field of nano-semiconductor composite material preparation, and relates to a modification method and application of an active metal catalyst. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Dyes refer to a class of organic compounds that can make other substances obtain bright and firm colors. Since the pigments used today are all artificially synthesized, they are also called synthetic dyes. While dyes bring colorful colors to people's lives and generate huge economic benefits, they also produce a large amount of environmentally harmful dye wastewater discharged into environmental waters, resulting in the pollution of natural waters. Pollutants in dye wastewater usually have complex and stable molecular structures, making it difficult to treat them with common biological methods. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66C02F1/30C02F101/38
CPCB01J23/66C02F1/30C02F2101/40C02F2305/10B01J35/39
Inventor 李志华郄元元曹国炜罗楠楠张敏
Owner SHANDONG NORMAL UNIV
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