Preparation method for nitrogen and carbon co-doped nanometer titanium dioxide visible-light photocatalyst

A nano-titanium dioxide and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of complex preparation process, low yield, high cost, etc., and achieve the effect of simple preparation process, good suspension and low cost

Inactive Publication Date: 2013-08-21
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the method has defects such as low yield, high cost, complicated preparation process and loaded down with trivial details.

Method used

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  • Preparation method for nitrogen and carbon co-doped nanometer titanium dioxide visible-light photocatalyst
  • Preparation method for nitrogen and carbon co-doped nanometer titanium dioxide visible-light photocatalyst
  • Preparation method for nitrogen and carbon co-doped nanometer titanium dioxide visible-light photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of nitrogen and carbon co-doped nano-titanium dioxide visible light photocatalyst, the specific preparation steps are:

[0026] Step 1, the preparation of ammonium carbonate supersaturated solution

[0027] Add ammonium carbonate and double distilled water into the container, heat to 50°C, and stir to prepare a supersaturated solution of ammonium carbonate;

[0028] Step 2, preparation of precursor solution

[0029] Take glacial acetic acid and add it to the container, add the absolute ethanol solution of tetrabutyl titanate while stirring, continue stirring for 5 minutes after the addition to obtain the precursor solution, and set aside; the added tetrabutyl titanate, absolute ethanol and ice The molar ratio of acetic acid is 1:5:1.

[0030] Step 3, preparation of titanium dioxide xerogel

[0031] Add the precursor solution prepared in step 2 into the reaction device, keep the temperature at 0°C to 20°C, and add the ammonium carbonate supersatur...

Embodiment 2

[0036] Step 1, the preparation of ammonium carbonate supersaturated solution

[0037] Add ammonium carbonate and double distilled water into the container, heat to 50°C, and stir to prepare a supersaturated solution of ammonium carbonate;

[0038] Step 2, preparation of precursor solution

[0039] Take glacial acetic acid and add it to the container, add the absolute ethanol solution of tetrabutyl titanate while stirring, continue stirring for 30 minutes after the addition to obtain the precursor solution, and set aside; the added tetrabutyl titanate, absolute ethanol and ice The molar ratio of acetic acid is 1:20:2.

[0040] Step 3, preparation of titanium dioxide xerogel

[0041] Add the precursor solution prepared in step 2 into the reaction device, keep the temperature at 0°C to 20°C, and add the ammonium carbonate supersaturated solution prepared in step 1 while stirring, so that a white precipitate appears, and the ammonium carbonate supersaturated solution Add the...

Embodiment 3

[0045] Step 1, the preparation of ammonium carbonate supersaturated solution

[0046] Add ammonium carbonate and double distilled water into the container, heat to 50°C, and stir to prepare a supersaturated solution of ammonium carbonate;

[0047] Step 2, preparation of precursor solution

[0048] Add glacial acetic acid into the container, add tetrabutyl titanate absolute ethanol solution while stirring, continue stirring for 20 minutes after the addition to obtain the precursor solution, and set aside; the added tetrabutyl titanate, absolute ethanol and ice The molar ratio of acetic acid is 1:15:3.

[0049] Step 3, preparation of titanium dioxide xerogel

[0050] Add the precursor solution prepared in step 2 into the reaction device, keep the temperature at 0°C to 20°C, and add the ammonium carbonate supersaturated solution prepared in step 1 while stirring, so that a white precipitate appears, and the ammonium carbonate supersaturated solution Add the amount so that the ...

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Abstract

The invention relates to a preparation method for nitrogen and carbon co-doped nanometer titanium dioxide visible-light photocatalyst. The preparation method comprises the steps of: taking and adding glacial acetic acid into a container, adding anhydrous ethanol solution of tetrabutyl titanate while agitating to prepare precursor solution, adding the precursor solution into a reaction device, keeping temperature to be 0-20 DEG C, adding ammonium carbonate super-saturated solution while agitating, forming gel after a great amount of white sediment appears, aging and drying to obtain titanium dioxide gel; and heating the titanium dioxide gel at program-controlled temperature in an atmosphere of flowing air, roasting for 1-3h at low temperature and cooling to room temperature to obtain the nitrogen and carbon co-doped nanometer titanium dioxide visible-light photocatalyst. Since conventional equipment and common raw materials are used in the method, the cost is low, the preparation process is simple and the large-scale industrialized production is easy to realize. The prepared photocatalyst particles are even, the grain size is small, the specific surface area is large, the photocatalyst shows high-efficiency photocatalyst degradation activity under the irradiation of visible light, and the degradation rate of rhodamine B within 90min reaches more than 91 percent.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-carbon co-doped nano-titanium dioxide visible light photocatalyst, belonging to the field of photocatalytic materials. Background technique [0002] Since Fujishima first reported hydrogen production by photolysis of water at a titanium dioxide single crystal electrode in Nature, 1972, 238: 37-38 in 1972, many scholars have conducted a lot of research on semiconductor photocatalysts. Use various methods to synthesize nano-semiconductor materials, study their photocatalytic degradation of organic pollutants, and look for photocatalysts with high photocatalytic activity, stability, non-toxicity and safety. Nano-titanium dioxide has the above-mentioned unique properties and has become the first choice for excellent photocatalytic materials. At present, the recognized nano photocatalyst is P25 (nano-titanium dioxide, Degussa), P25 is composed of 75% anatase type and 25% rutile type nano-titanium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30
Inventor 孟哈日巴拉郭金毓李彦伟付乌有王燕张战营
Owner HENAN POLYTECHNIC UNIV
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