A kind of surface iron modified titanium dioxide photocatalyst and its preparation method and application

A titanium dioxide and catalyst technology, applied in the field of photocatalysts, can solve the problems of increasing or reducing the concentration of oxygen defects, different optimal temperatures, weakening the photoactivity of titanium oxide, etc., and achieves a photocatalyst with increased activity, simple preparation method and good stability. Effect

Inactive Publication Date: 2011-11-30
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First of all, at present, people mostly use inorganic iron salts such as ferric chloride, ferric nitrate, ferric sulfate, etc. as iron sources. When doping iron ions, it cannot guarantee that the anions in the substrate can be completely removed. Some reports point out that some anions It may have a quenching effect on active species such as hydroxyl radicals, thereby weakening the photocatalytic activity of titanium dioxide itself
Secondly, composite catalysts usually need to be sintered at high temperature to increase crystallinity, but the optimal temperature for titanium dioxide and iron oxide corresponding to the highest photoactivity is different, which makes people contradictory when discussing the influence of temperature
In addition, iron elements will separate from titanium dioxide to form independent crystal phases at high temperatures, such as Fe 2 o 3 and Fe 2 TiO 5 , from TiO to Fe 2 o 3 or Fe 2 TiO 5 The charge transfer may weaken the photoactivity of titanium oxide itself
Third, it is still debated whether the doping of iron ions in the oxide lattice will increase or decrease the concentration of oxygen defects
In addition, excessive or uneven loading of iron on the surface of titania usually leads to Fe x o y The aggregation of clusters, and the dissolution of iron into the aqueous solution is also inevitable during the photocatalytic reaction, these phenomena are not conducive to the transfer of electrons and the recycling of samples.

Method used

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  • A kind of surface iron modified titanium dioxide photocatalyst and its preparation method and application
  • A kind of surface iron modified titanium dioxide photocatalyst and its preparation method and application
  • A kind of surface iron modified titanium dioxide photocatalyst and its preparation method and application

Examples

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Embodiment 1

[0039] Using commercial anatase titanium dioxide (CAT) as the titanium source and carboxylated iron phthalocyanine (FeTCPC) as the iron source, the composite photocatalysts of titanium dioxide pretreated at different temperatures and modified with surface iron were prepared by adsorption-ashing method.

[0040] Step 1: At room temperature, weigh 0.250g of CAT that has been pre-calcined at a certain temperature for 3 hours. Evenly dispersed;

[0041] The second step is to ensure a dark environment, and under vigorous stirring, add 25 mL of FeTCPC solution with DMF as the solvent concentration of 100 ppm to the titanium oxide suspension obtained in the first step, and continue to stir in the dark for 12 hours;

[0042] In the third step, FeTCPC can be completely adsorbed to the surface of CAT, the suspension is filtered with suction, washed with deionized water until no DMF exists, and dried at 70°C in the dark;

[0043] The fourth step is to collect the solid samples from the ...

Embodiment 2

[0048] Using commercial anatase titanium dioxide (CAT) as titanium source and carboxylated iron phthalocyanine (FeTCPC) as iron source, the surface iron-modified titanium dioxide composite photocatalysts with different ashing temperatures were prepared by adsorption-ashing method.

[0049] Step 1: At room temperature, weigh 0.250g of CAT that had been pre-calcined at 600°C for 3 hours, put it into 225mL of deionized water, and disperse it evenly by ultrasonication for 5 minutes;

[0050] The second and the third step are the same as embodiment 1;

[0051] The fourth step is to collect the solid samples from the third step and place them in a muffle furnace for ashing at a certain temperature. The temperature can be 300, 400, 500, 600, or 700°C;

[0052] The fifth and sixth steps are the same as in Example 1 to obtain surface iron-modified titanium dioxide and blank titanium dioxide samples treated at different ashing temperatures, which are respectively denoted as Fe x2 / CAT6...

Embodiment 3

[0055] Using commercial anatase titanium dioxide (CAT) as the titanium source and carboxylated iron phthalocyanine (FeTCPC) as the iron source, the surface iron-modified titanium dioxide composite photocatalysts with different iron contents were prepared by adsorption-ashing method.

[0056] The first step is with embodiment 1;

[0057] In the second step, to ensure a light-proof environment, under vigorous stirring, add 25 mL of FeTCPC solution with a certain concentration of pyridine as a solvent to the titanium dioxide suspension obtained in the first step, and continue to stir in the dark for 12 hours. The concentration of FeTCPC (DMF) can be specifically 0, 20, 50, 80, 100, 120, 150, 180, 200, 250, 300, 500ppm;

[0058] The third to fifth steps are the same as in Example 1 to obtain surface iron-modified titanium dioxide composite photocatalysts with different iron contents, which are denoted as Fe400 / CAT600. The mass fraction of iron in the solid is specifically 0, 0.01...

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Abstract

The invention provides a surface iron modified titanium dioxide photocatalyst comprising titanium dioxide powder and / or film, wherein a highly-dispersive iron oxygen compound is contained in the surface of the titanium dioxide powder and / or film. The invention also provides a preparation method of the photocatalyst, comprising the steps of: adsorbing the iron phthalocyanine in a solution to the surface of the titanium dioxide through taking pre-burnt titanium dioxide as a titanium source, taking macromolecule iron phthalocyanine with different substituent groups as an iron source and taking water-organic solvent as a mixed solvent, firing at a specific temperature so as to destroy a ring structure of phthalocyanine, removing carbon, nitrogen, oxygen and hydrogen elements except the iron element in iron phthalocyanine molecule and finally obtaining the composite photocatalyst. The invention also provides application of the photocatalyst and the photocatalyst can be used for degrading phenol and chlorinated phenol organics by utilizing ultraviolet light. The photocatalyst provided by the invention has the advantages that raw materials are easy to get, the preparation method is simple, compared with a blank titanium dioxide photocatalyst, the iron modified titanium dioxide photocatalyst has obviously increased activity and the stability of the photocatalyst is good to ensure thatphenomenons of salvation and form transition of iron do not happen in reaction processes.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, relates to a method for modifying the surface of titanium oxide, and more specifically provides a method for preparing a surface iron-modified titanium oxide photocatalyst and an application of ultraviolet photocatalytic degradation of organic matter. Background technique [0002] In the 21st century, the environment and energy have become major issues facing and urgently to be solved by human beings. Today, with the depletion of traditional energy sources such as oil and coal and the deteriorating living environment, photocatalytic reactions rely on their huge energy potential, mild and deep reaction conditions And a wide range of applications have attracted more and more attention. Since the 1980s, photocatalysis has made rapid progress in the treatment of various pollutants in water and gas phases, and there are more and more researches on the application of photocatalysis technology in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/745B01D53/86B01D53/72
Inventor 许宜铭孙琼
Owner ZHEJIANG UNIV
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