Preparation method and application of MnOOH/Ag nano-composite material

A nano-composite material and nano-rod technology, which is applied in the field of preparation of nOOH/Ag nano-composite materials, can solve the problems such as the inability to control the morphology of precious metals, and achieve the effects of superior catalytic performance, high repeatability and easy operation.

Inactive Publication Date: 2015-03-04
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many steps, and the morphology of the noble metal loaded on the surface of the substrate cannot be controlled

Method used

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  • Preparation method and application of MnOOH/Ag nano-composite material
  • Preparation method and application of MnOOH/Ag nano-composite material
  • Preparation method and application of MnOOH/Ag nano-composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of preparation method of MnOOH / Ag nano composite material, comprises the following steps:

[0041] a. Disperse 15 mg of the raw material MnOOH nanorods in 30 mL of 1 mol / L sodium salt solution, sonicate for 20 min, add 1 mL of polystyrene sodium sulfonate (PSS) under stirring, and stir for 1 h. Centrifuge and wash the pellet 5 times with deionized water.

[0042] B, the product obtained in step (a) is dispersed in 50mL H 2 O, add 5mg AgNO 3 , and added 100mg of PVP, stirred for 1h.

[0043] c. Add 200 μL 37% HCHO (density 1.08 g / ml) to the system, add 500 μL NH 3 .H 2 O to adjust the pH to be alkaline, continue stirring for 1 h, centrifuge, wash with deionized water and absolute ethanol several times, and dry at 60°C. The MnOOH / Ag nanosheet composite was obtained.

[0044] The reducing agents HCHO and NH 3 .H 2 O is replaced by hydrazine hydrate, under the above experimental conditions, MnOOH / Ag nanoparticle composites can be obtained

[0045] Fig. 1 (a)...

Embodiment 2

[0049] a. Disperse 15 mg of the raw material MnOOH nanorods in 30 mL of 1 mol / L sodium salt solution, sonicate for 30 min. Add 1 mL of polystyrene sodium sulfonate (PSS) under stirring, and stir for 1 h. Centrifuge and wash the pellet 6 times with deionized water.

[0050] B, the product obtained in step (a) is dispersed in 50mL H 2 O, add 5mg AgNO 3 , and added 15mg of PVP, stirred for 1h.

[0051] c. Add 200 μL 37% HCHO (density 1.08 g / ml) to the system, add 500 μL NH 3 .H 2 O to adjust the pH to be alkaline, continue stirring for 1 h, centrifuge, wash with deionized water and absolute ethanol several times, and dry at 60°C. The MnOOH / Ag nanosheet composite was obtained.

Embodiment 3

[0053] a. Disperse 15 mg of raw material MnOOH nanorods in 30 mL of 1 mol / L sodium salt solution, ultrasonicate for 25 min, add 1 mL of polystyrene sodium sulfonate (PSS) under stirring, and stir for 1 h. Centrifuge and wash the pellet 5 times with deionized water.

[0054] B, the product obtained in step (a) is dispersed in 50mL H 2 O, add 5mg AgNO 3 , and added 75mgPVP, stirred for 1h.

[0055] c. Add 200 μL 37% HCHO (density 1.08 g / ml) to the system, and 500 μL NH 3 .H 2 O to adjust the pH to be alkaline, continue stirring for 1 h, centrifuge, wash with deionized water and absolute ethanol several times, and dry at 60°C. The MnOOH / Ag nanosheet composite was obtained.

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Abstract

The invention discloses a preparation method and application of a MnOOH/Ag nano-composite material. The preparation method is characterized by comprising the steps of decorating the surface of MnOOH with polystyrene sodium sulfonate (PSS) by adopting HCHO or hydrazine hydrate as a reducing agent, and uniformly and rapidly adsorbing Ag<+1> onto the surface of MnOOH in the stirring process; adding the reducing agent under the protection of PVP, enabling Ag to grow along a specific crystal plane, and carrying out in-situ reduction on the Ag in one step to obtain the MnOOH/Ag nano-sheet composite material with novel morphology. Compared with the prior art, the preparation method has the advantages that the method is carried out under a normal temperature condition, the reaction time is relatively short, the operation is simple, and the repeatability is relatively high. By changing the type of the reducing agent, the MnOOH/Ag nano-composite material with different morphologies can be obtained. The prepared MnOOH/Ag nano-composite material has catalytic performance and has excellent catalytic performance of catalytically reducing 4-nitrophenol.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite material, in particular to a preparation method and application of a MnOOH / Ag nanocomposite material. Background technique [0002] At present, the methods for preparing noble metal composites can be generally divided into four types: 1. Adsorption of noble metals on porous substrates; 2. Surface modification of substrates; 3. Replacement by redox reactions; 4. Noble metal / substrate core Shell structure design. It is a commonly used method to synthesize Ag nanocomposites by modifying the surface of the substrate with organic groups and relying on electrostatic attraction, intermolecular force, etc. to load Ag nanoparticles to the surface of the substrate. The loading method of Ag mainly includes in situ reduction. and ectopic growth. Commonly used modifiers include: organic polymers, surfactants, silane coupling agents, etc., specifically including hydrothermal method, microwave-assiste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B82Y30/00C07C215/76C07C213/02
Inventor 张莉刘畅倪永红
Owner ANHUI NORMAL UNIV
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