A preparation method of modified activated carbon fiber filaments loaded with nano-titanium dioxide on the surface

A technology of activated carbon fiber filaments and nano-titanium dioxide, which is applied in the field of photocatalytic materials, can solve the problems that the photocatalytic reaction does not have a positive promoting effect, cannot ensure the photocatalytic effect of the catalyst, and the catalyst cannot achieve the photocatalytic effect, etc. Increased efficiency and uniform load

Active Publication Date: 2018-03-16
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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Problems solved by technology

Since there is no binder added to the impregnation solution, the loading is purely dependent on the adsorption of granular activated carbon itself; and the specific surface area of ​​granular activated carbon is smaller than that of activated carbon fibers, resulting in nano-TiO 2 The loading efficiency is not high, nano-TiO 2 The adhesion between the activated carbon surface is not high, the load stability is poor, and it is easy to fall off after repeated use, which will affect the photocatalytic effect;
[0009] 2. Use modified activated carbon fibers to immerse in an impregnating solution composed of titanium salts and other components for liquid phase deposition, and then calcine at high temperature to remove organic matter and make TiO 2 Loaded on the surface of activated carbon fibers, it has the advantages of simple loading process and good stability, but due to the constraints of preparation conditions, calcination temperature and other factors, the TiO loaded on the surface of activated carbon fibers 2 Cannot be maintained in anatase TiO 2 and rutile TiO 2 Optimum photocatalytic mixed crystal structure with a mixing ratio of about 75:25; it is not guaranteed that the resulting activated carbon fibers support TiO 2 Catalyst achieves the best photocatalytic effect
[0010] 3. Use the modified activated carbon fiber to immerse in the impregnation solution composed of titanium salt and other components for liquid phase deposition. Since there are only titanium salt and urea in the precursor solution, there is no doping of Fe 3+ 、Mo 5+ 、Ru 3+ , V 4+ and other transitional metal ions, and no photoactive compounds such as thionine and fluorescein derivatives are added, so the wavelength range of the excitation light is still kept below 387nm, which does not actively promote the photocatalytic reaction, resulting in the activated carbon fiber made from it loaded TiO 2 The catalyst cannot achieve the best photocatalytic effect

Method used

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  • A preparation method of modified activated carbon fiber filaments loaded with nano-titanium dioxide on the surface
  • A preparation method of modified activated carbon fiber filaments loaded with nano-titanium dioxide on the surface
  • A preparation method of modified activated carbon fiber filaments loaded with nano-titanium dioxide on the surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of modified activated carbon fiber filaments, the steps are:

[0047] (a) Pretreatment: Soak PAN (polyacrylonitrile)-based carbon fiber filaments in deionized water, heat and boil for 2.5 hours with constant stirring, then soak in room temperature deionized water for 3 hours with constant stirring, and finally rinse with deionized water Clean and remove impurities on the surface of carbon fiber filaments. Dry the cleaned activated carbon fiber filaments in an oven at 120°C for 10 h to obtain pretreated activated carbon fiber filaments;

[0048] (b) Dipping and drying: put the pretreated activated carbon fiber in 0.15mol / L nitric acid solution, add ammonium dihydrogen phosphate (analytical pure, mass concentration 99%, molar concentration ratio to nitric acid 10:15) Soak for about 12 hours, then take it out and heat and dry for 10 hours, turn on N 2 Protected and calcined at 560°C for 0.8h, kept at 95°C for 1h, and cooled to room temperature to obtain m...

Embodiment 2

[0056] Same as the preparation method of the modified activated carbon fiber filament in Example 1. The difference is that nano-TiO 2 The method that is loaded on the modified active carbon fiber silk, its step is:

[0057] (a) Pretreatment: Soak the modified activated carbon fiber in 10% hydrogen peroxide for 1 hour, rinse it with deionized water for 5 times, and dry it at 120°C for 2.5 hours with nitrogen filling;

[0058] (b) Solution preparation: Dissolve 20g of epoxy resin in 1L of acetone, stir and add 35g of commercially available nano-TiO in sequence 2 (Degussa P25), 3.5g UV-P and 2g Nano Fe 2 o 3 ;

[0059] (c) Impregnation and drying: Put the modified activated carbon fiber filaments into the solution and immerse them for 45 minutes, and dry them at 120°C for 0.5h under a nitrogen atmosphere; 2 Modified activated carbon fiber filaments;

[0060] (d) Functional testing of modified activated carbon fibers: use a shallow pool structure reactor to treat dye wastewa...

Embodiment 3

[0062] Same as Example 1, except that the preparation method of the modified activated carbon fiber filament in Example 1 is the same. The difference is that nano-TiO 2 The method that is loaded on the modified active carbon fiber silk, its step is:

[0063] (a) Pretreatment: Soak the modified activated carbon fibers in 10% hydrogen peroxide for 1 hour, rinse them with deionized water for 5 times, and dry them at 120°C for 2.0 hours with nitrogen filling;

[0064] (b) Solution preparation: Dissolve 15g of epoxy resin in 1L of acetone, stir and add 25g of commercially available nano-TiO in sequence 2 (Degussa P25), 6g UV-P and 1.5g nano Fe 2 o 3 ;

[0065] (c) Impregnation and drying: Put the modified activated carbon fiber filaments into the solution and immerse them for 60 minutes, then dry them at 120°C for 0.5 hours under a nitrogen atmosphere, then raise the temperature to 400°C and dry them for 2.5 hours to obtain surface-loaded nano-TiO 2 Modified activated carbon f...

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Abstract

The invention discloses a preparation method of modified activated carbon fiber filaments loaded with nano-titanium dioxide on the surface, belongs to the field of photocatalytic materials in environmental protection, and has wide application in the fields of water purification, waste water treatment, waste gas treatment, air purification, disinfection and antibacterial, etc. research and application prospects. In the present invention, the modified activated carbon fibers are fully immersed in a mixed solution formed by nano-TiO2 (Degussa P25), acetone, epoxy resin, UV‑P and nano-Fe2O3, and then dried under a nitrogen atmosphere. The modified activated carbon fiber filaments with nano-titanium dioxide loaded on the surface can be obtained. The various raw materials used in the present invention are easy to obtain, the preparation method is simple, the nano-TiO2 layer has the advantages of high cohesion, good stability, uniform loading, wide excitation light wavelength range, and good photocatalytic performance; it can be widely used in the purification of water , waste water treatment, waste gas treatment, air purification, disinfection and antibacterial and other fields.

Description

technical field [0001] The invention relates to a method for preparing modified activated carbon fiber filaments loaded with nano-titanium dioxide on the surface, which belongs to the field of photocatalytic materials in environmental protection, and has extensive applications in the fields of water purification, waste water treatment, waste gas treatment, air purification, disinfection and antibacterial, etc. research and application prospects. Background technique [0002] Since the discovery of n-type semiconductor TiO by Fujishima et al. in 1972 2 Since the electrode has photoelectric catalysis, its application range has gradually expanded from new energy development to environmental protection. TiO 2 Non-toxic, high catalytic activity, strong oxidation ability, good stability, wide band gap (about 3.2eV), can effectively use solar energy (about 3% of the total solar light intensity) to photocatalytically oxidize organic matter, in the purification of water, waste wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/18B01J21/06B01J35/06C02F1/30C02F1/72B01D53/86B01D53/72C02F101/30C02F101/38
CPCY02W10/37
Inventor 张毅赵克强王伟王霞王娜宋宁慧李德波李维新卜元卿唐秋萍吴京贺昭和王伟民李秀霞李超然赵志强唐晓燕王文林庄巍何斐李文静刘勇华张幸
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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