TiO2 single-crystal nanorod-activated carbon fiber composite photocatalyst, and preparation method and applications thereof

An activated carbon fiber, single crystal nanotechnology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc. The porosity is large, the energy consumption is reduced, and the effect is not easy to fall off

Inactive Publication Date: 2013-07-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the carbonaceous materials are easy to reach adsorption saturation, and also solve the problem of powder TiO 2 It is difficult to recycle and easily cause secondary pollution when it is used for photocatalytic degradation of organic pollutants. To provide a TiO with good photocatalytic properties formed on the surface of activated carbon fibers 2 The single crystal nanorod layer is used to prepare a loaded nanocomposite photocatalyst with large specific surface area, good adsorption and catalytic synergistic effect, good reusability, and easy recovery, that is, the TiO 2 Preparation method of single crystal nanorod-activated carbon fiber composite photocatalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Based on activated carbon fiber, NH 4 F is the hydrothermal solute, the metal titanium sheet is the titanium source, and TiO is prepared 2 Single crystal nanorod-activated carbon fiber composite photocatalyst, the specific steps are as follows:

[0028] 1. Preparation of matrix material: Take felt-like activated carbon fiber with a thickness of about 3mm as the matrix material, cut it into a uniform square of 2cm×2cm, ultrasonically clean it in ethanol and water for 15min and 5min, and dry it in a drying oven at 40°C Set aside to dry.

[0029] 2. TiO2 2 Synthesis of Single Crystal Nanorod-Activated Carbon Fiber Composite Photocatalyst:

[0030] Use metal titanium sheet as the titanium source, cut into thin needle-like strips, ultrasonically wash in acetone and water for 20 minutes and 5 minutes respectively, and dry for later use;

[0031] NH with a concentration of 2.5 μM was prepared in the lining of a reaction kettle with a volume of 80 mL 4 F aqueous solution 5...

Embodiment 2

[0035] The preparation method of this embodiment is the same as that of Example 1, except that NH in step 2 4 The concentration of the F aqueous solution was 5 μM.

[0036] TiO synthesized by this process 2 The single crystal nanorod-activated carbon fiber composite photocatalyst is a mixed crystal structure of anatase and rutile, the film thickness is about 1 μm, and the nanorod size is between 50 and 200nm. Degradation ability, repeated use 10 times, the degradation rate change is less than 2%.

Embodiment 3

[0038] The preparation method of this embodiment is the same as that of Example 1, except that NH in step 2 4 The concentration of the F aqueous solution was 7.5 μM.

[0039] TiO synthesized by this process 2 The single crystal nanorod-activated carbon fiber composite photocatalyst is a mixed crystal structure of anatase and rutile, the film thickness is about 1 μm, and the nanorod size is between 50 and 200nm. Degradation ability, repeated use 10 times, the degradation rate change is less than 2%.

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Abstract

The invention relates to the technical fields of nano-materials and photocatalytic degradation of organic pollutants, and specifically relates to a TiO2 single-crystal nanorod-activated carbon fiber composite photocatalyst, and a preparation method and applications thereof. A supported TiO2 single-crystal nanorod-activated carbon fiber composite photocatalyst with a good organic pollutant degradation ability is prepared by a hydrothermal method by taking metallic titanium as a titanium source on the surface of an activated carbon fibrofelt with certain porosity and strong adsorbability as a matrix. Porous activated carbon fibers used in the invention have strong adsorbability, and are used as a stable matrix for the uniform supporting of TiO2 single-crystal nanorods. Obtained TiO2 nanorods are directly crystallized in the process of synthesis, and not required to be subjected to subsequent high-temperature crystallization; and through adjusting the reaction temperature and the reaction time, crystal-form controllable TiO2 nanorods are grown on the activated carbon fibers, and the prepared composite photocatalyst can be cut into any size as required so as to satisfy the requirement of actual applications. Meanwhile, the preparation process is simple, and easy to implement.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and photocatalytic degradation of organic pollutants, in particular to a TiO 2 Single crystal nanorod-activated carbon fiber composite photocatalyst, preparation method and application thereof. Background technique [0002] Porous carbonaceous materials are widely used in the treatment of water pollutants and indoor air purification because of their large specific surface area and good adsorption properties, but the pollutants are only temporarily transferred to these adsorption materials without being degraded. However, the adsorption material eventually reaches the adsorption saturation state, and it still needs to be recycled and regenerated when the adsorption material is reused. [0003] Anatase Phase Nano TiO 2 With a unique electronic structure, it generates strong oxidizing holes after absorbing photons. It is a photocatalytic material with deep oxidation, which can completely oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18B01J35/06B01D53/86C02F1/30
CPCY02C20/30
Inventor 徐光青冯春晓吕珺吴玉程郑治祥
Owner HEFEI UNIV OF TECH
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