Iron and nitrogen co-doping titanium dioxide/active carbon photocatalyst

A titanium dioxide and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical/physical processes, chemical instruments and methods, etc., can solve the problem of high recombination rate of photogenerated electrons and holes, increased energy consumption and operating costs, and low catalytic efficiency to achieve high pollutant removal efficiency and reuse rate, which is beneficial to adsorption performance and simplifies the operation process

Inactive Publication Date: 2013-08-14
FUJIAN ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the photocatalysts used are mainly titanium dioxide (TiO 2 ) / activated carbon photocatalyst, but it has the following disadvantages: the band gap is wide, it can only be excited by ultraviolet light to produce photocatalytic activity, and the recombination rate of photogenerated electrons and holes is high, resulting in low catalytic efficiency
This process has two-step doping, and the operation is relatively cumbersome, and the preparation of activated carbon requires a high-temperature activation process, which increases energy consumption and operating costs.

Method used

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preparation example Construction

[0024] A preparation method of iron, nitrogen co-doped titanium dioxide / activated carbon photocatalyst, the method specifically comprises the following steps:

[0025] (1) Mixing of raw materials: (a) Mix the carbon source material and titanium dioxide at a mass ratio of 1:0.01 to 0.3, and stir evenly to form a mixture; (b) Mix the solution of ferric nitrate and pure additives at a mass ratio of 1 to 15 : 100 for mixing and dissolving to form a mixed liquid; (c) Mix the above-mentioned mixture and the mixed liquid (based on the mass of the pure additive) at a mass ratio of 1:0.75-2.5, stir evenly, and immerse at room temperature for 0.5-12 hours.

[0026] (2) Forming: Knead the above impregnated raw materials at 100-250°C for 10-120 minutes, and after the raw materials are in a loose state, carry out extrusion molding.

[0027] (3) Hardening: harden the above-mentioned molding raw materials at 100-250°C for 1-6 hours.

[0028] (4) Activation roasting: Activate the above-menti...

Embodiment 1

[0031] A preparation method of iron, nitrogen co-doped titanium dioxide / activated carbon photocatalyst, the method specifically comprises the following steps:

[0032] (1) Mixing of raw materials: (a) Mix fir chips with a water content of 10% and titanium dioxide at a mass ratio of 1:0.1, and stir evenly to form a mixture; (b) Ferric nitrate and 50% phosphoric acid solution are mixed at a mass ratio of Mix and dissolve at a ratio of 1:10 to form a mixed solution; (c) Mix the above-mentioned mixture and the mixed solution (based on the mass of pure phosphoric acid) at a mass ratio of 1:1.5, stir evenly, and immerse at room temperature for 6 hours.

[0033] (2) Forming: Put the impregnated raw materials above in a kneader and knead them at 140°C for 50 minutes. After the raw materials are in a loose state, place them in a twin-screw extruder for extrusion molding.

[0034] (3) Hardening: Put the above-mentioned molding raw materials in a tunnel drying kiln for hardening at 140°C f...

Embodiment 2

[0038] A preparation method of iron, nitrogen co-doped titanium dioxide / activated carbon photocatalyst, the method specifically comprises the following steps:

[0039] (1) Mixing of raw materials: (a) mix bamboo chips with a water content of 8% and titanium dioxide at a mass ratio of 1:0.15, and stir evenly to form a mixture; (b) mix ferric nitrate with a 60% solution at a mass ratio of 1 :20 for mixing and dissolving to form a mixed solution; (c) Mix the above-mentioned mixture and the mixed solution (based on the mass of pure phosphoric acid) at a mass ratio of 1:1.25, stir evenly, and immerse at room temperature for 8 hours.

[0040] (2) Forming: Put the impregnated raw materials above in a kneader and knead for 40 minutes at 150°C. After the raw materials are in a loose state, place them in a twin-screw extruder for extrusion molding.

[0041] (3) Hardening: Put the above-mentioned molding raw materials in a tunnel drying kiln for hardening at 150°C for 2 hours.

[0042] ...

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Abstract

The invention discloses an iron and nitrogen co-doping titanium dioxide/active carbon photocatalyst as well as a preparation method and application thereof. The preparation method comprises the process steps of raw material mixing, forming, hardening, activating, roasting, washing, drying and the like. The preparation method has the advantages of reducing the energy consumption, saving the operating time, simplifying the operation process and using equipment and reducing the running cost, and the prepared iron and nitrogen co-doping titanium dioxide/active carbon photocatalyst has a higher efficiency of removing contaminants, a higher reuse ratio, and better environmental compatibility and uniformity.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to an iron and nitrogen co-doped titanium dioxide / activated carbon photocatalyst and its preparation method and application. Background technique [0002] Photocatalytic degradation technology can be carried out under normal temperature and pressure, can completely destroy organic matter, has no secondary pollution and is not too expensive, and is widely used in the fields of organic pollutant degradation, sewage treatment, air purification and other fields. [0003] At present, the photocatalysts used are mainly titanium dioxide (TiO 2 ) / activated carbon photocatalyst, but it has the following disadvantages: wide band gap, can only be excited by ultraviolet light to produce photocatalytic activity, high recombination rate of photogenerated electrons and holes, resulting in low catalytic efficiency. Therefore, it must be modified, and the modification methods mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 林冠烽黄彪陈涵吴开金林道茂陈志强常颖萃
Owner FUJIAN ACAD OF FORESTRY
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