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A kind of ag-carbon nanofiber composite material and its preparation method and application

A technology of carbon nanofibers and composite materials, applied in chemical instruments and methods, special compound water treatment, physical/chemical process catalysts, etc., can solve the problems of difficult to effectively control the size of nano-Ag, Ag dispersion, complex process, high preparation temperature, etc. problems, to achieve excellent photocatalytic degradation performance, mild conditions, and easy operation

Active Publication Date: 2020-02-11
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the preparation of carbon nanofibers by electrospinning and chemical vapor deposition often involves complex processes and requires special equipment or high preparation temperatures; - Carbon nanofiber composite materials, it is difficult to effectively control the size of nano-Ag and the dispersion of Ag

Method used

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  • A kind of ag-carbon nanofiber composite material and its preparation method and application
  • A kind of ag-carbon nanofiber composite material and its preparation method and application
  • A kind of ag-carbon nanofiber composite material and its preparation method and application

Examples

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preparation example Construction

[0039] The invention provides the preparation method of Ag-carbon nanofiber composite material, is characterized in that, comprises the following steps:

[0040] (1) providing the phosphate mixed solution comprising chlorine source and phosphate and the inorganic silver salt mixed solution comprising chlorine source and inorganic silver salt;

[0041] (2) mixing the phosphate mixed solution and the inorganic silver salt mixed solution, and carrying out a precipitation reaction to obtain a catalyst precursor;

[0042](3) Mixing the catalyst precursor obtained in the step (2) with an organic monosaccharide, a chlorine source and a solvent to obtain a precursor mixed solution, and performing a hydrothermal reaction to obtain an Ag-carbon nanofiber composite material.

[0043] The present invention provides a phosphate mixed solution including a chlorine source and a phosphate and an inorganic silver salt mixed solution including a chlorine source and an inorganic silver salt.

...

Embodiment 1

[0076] Preparation of catalyst precursor:

[0077] Weigh 17.5mg NaCl and dissolve it in deionized water, transfer to a 1000mL volumetric flask to prepare a 0.3mmol / L NaCl aqueous solution, and set aside.

[0078] 0.2g Na 2 HPO 4 Dissolve in 10mL of the above NaCl aqueous solution; 0.2g AgNO 3 Dissolve in 30 mL of the above NaCl aqueous solution.

[0079] Under 250rpm magnetic stirring, Na 2 HPO 4 The mixed solution was added to the AgNO at a rate of 0.3mL / min 3 In the mixed solution, a yellow precipitate was formed, which was centrifuged and washed to obtain a yellow solid Ag 3 PO 4 -AgCl.

[0080] In situ growth of Ag-carbon nanofibers by hydrothermal reaction:

[0081] Weigh 5.9451g of glucose and dissolve it in 60mL of the aforementioned NaCl aqueous solution, add the aforementioned yellow solid Ag 3 PO 4 -AgCl was ultrasonically dispersed, then transferred to a hydrothermal reactor, and the hydrothermal reactor was kept in an oven at 180°C for 5 hours at a heati...

Embodiment 2

[0084] The Ag-carbon nanofiber composite material prepared in Example 1 was used for photocatalytic degradation of methylene blue solution.

[0085] In the photoreactor, 30 mg of Ag-carbon nanofiber samples were weighed and dispersed in 100 mL of methylene blue solution with a concentration of 50 mg / L. Under dark conditions, methylene blue was adsorbed on the photocatalyst for 2 h to achieve adsorption-desorption equilibrium, and every 20 min Take out 3mL of liquid and centrifuge to separate the catalyst, then carry out the UV-Vis absorption spectrum test. Then, the photoreactor was irradiated with visible light with a wavelength greater than 400nm for 2 hours for photocatalytic reaction, and 3 mL of liquid was taken out every 15 minutes and centrifuged to separate the catalyst for UV-Vis absorption spectrum test to determine the concentration change of methylene blue with the reaction time.

[0086] Under the same conditions, the Ag photocatalyst without carbon nanofibers was...

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Abstract

The invention provides an Ag-carbon nanofiber composite material and its preparation method and application. The preparation method provided by the invention adopts a one-step method, the conditions are mild, no special equipment is required, no high temperature and high pressure is required, the operation is simple and easy, and the efficiency is high; and the hydrothermal reaction does not need a template, and the monosaccharide is used as a carbon source to realize the monosaccharide and Catalyst precursor Ag 3 PO 4 ‑The reduction reaction between AgCl realizes the in-situ catalytic growth of carbon nanofibers, while the in-situ Ag nanoparticles are highly dispersed on the carbon nanofibers and the Ag nanowires are in-situ filled in the carbon nanofiber cavities. The results of the examples show that the Ag-carbon nanofiber composite material is applied to the photocatalytic degradation of organic pollutant methylene blue under visible light. After 2h of adsorption in the dark state, the concentration of methylene blue drops to 55% of the initial concentration, and after 2h After visible light photocatalytic degradation, the removal efficiency of methylene blue can reach more than 95%.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials, in particular to an Ag-carbon nanofiber composite material and its preparation method and application. Background technique [0002] Dye polluted water is an increasingly serious environmental problem. Water polluted by dyes has high toxicity, potential mutagenesis and carcinogenicity. The methods commonly used to solve the problem of dye pollution in industrial wastewater include adsorption, coagulation, and membranes. Separation, chemical oxidation and photocatalysis. Among them, the photocatalytic method mostly utilizes solar energy through semiconductor photocatalysts, without adding expensive oxidants, and can convert macromolecular organic pollutants into low-toxic small organic molecules, carbon dioxide and water at normal temperature and pressure, and is considered to be a A method for effectively degrading organic pollutants. [0003] As a visible light-responsive photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/06C02F1/30C02F101/36C02F101/38
CPCC02F1/30B01J23/50C02F2305/08C02F2101/36C02F2101/40C02F2101/38B01J35/39B01J35/58Y02W10/37
Inventor 刘鑫陈长凤贾玉帅
Owner JIANGXI NORMAL UNIV
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