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Method for preparing ZnO/ZnGaNO two-phase composite structure photocatalytic powder

A composite structure and photocatalytic technology, applied in the field of photocatalytic materials, can solve the problems of hindering the redox reaction of photogenerated carriers, affecting the migration of photogenerated carriers, affecting the absorption of visible light, etc., and achieves short preparation time, low cost, and decolorization powerful effect

Active Publication Date: 2016-02-03
XIAMEN UNIV OF TECH
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Problems solved by technology

The interior of the ZnGaNO solid solution prepared by increasing the pH method is porous, which affects the migration of photogenerated carriers inside the solid solution; in addition, the surface of the ZnGaNO solid solution prepared by increasing the pH method often has ZnGa 2 o 4 Impurities such as ZnGaNO affect the absorption of visible light and prevent photogenerated carriers from contacting with the solution to participate in the oxidation-reduction reaction.

Method used

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  • Method for preparing ZnO/ZnGaNO two-phase composite structure photocatalytic powder
  • Method for preparing ZnO/ZnGaNO two-phase composite structure photocatalytic powder
  • Method for preparing ZnO/ZnGaNO two-phase composite structure photocatalytic powder

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Embodiment 1

[0046] Embodiment 1: Preparation of ZnO / ZnGaNO two-phase composite structure powder

[0047] (1) 12 grams of Ga(NO 3 ) 3 9H 2 O and 12 g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 100 mL of aqueous solution, and then the mixed metal solution of gallium and zinc was quickly poured into 70 mL of 1mol / L Na 2 CO 3 In the solution, stir constantly at the same time, the mixing speed is 30mL / s, and the stirring speed is 1500rpm, and a white precipitate is obtained; when all the metal solution is poured, the pH of the mixed solution is adjusted to 8 with 2mol / L NaOH solution;

[0048] (2) Put the obtained mixed solution in a water bath at 80° C. for 12 hours while keeping constant stirring.

[0049] (3) centrifuging the precipitate and washing it with deionized water, repeated three times; drying the centrifuged precipitate at 80° C. for 12 hours to obtain a white solid;

[0050] (4) The precursor was obtained by grinding the white solid into powder with an agate mortar. Put the...

Embodiment 2

[0059] Embodiment 2: Preparation of ZnO / ZnGaNO two-phase composite structure powder

[0060] (1) 12 grams of Ga(NO 3 ) 3 9H 2 O and 17.82 g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 100 mL of aqueous solution, then the mixed metal solution of gallium and zinc was poured into 70 mL of 1M Na 2 CO 3 In the solution, the mixing speed is 10mL / s, and the stirring speed is 1000rpm; when all the metal solution is poured, adjust the pH of the mixed solution to 7 with 2M NaOH solution;

[0061] (2) Put the obtained mixed solution in a water bath at 80° C. for 12 hours while keeping constant stirring.

[0062] (3) centrifuging the precipitate and washing it with deionized water, repeated three times; drying the centrifuged precipitate at 80° C. for 12 hours to obtain a white solid;

[0063] (4) The precursor was obtained by grinding the white solid into powder with an agate mortar. Put the precursor into a high-temperature energy-saving tube furnace for sintering at 800°C and react ...

Embodiment 3

[0064] Embodiment 3: Preparation of ZnO / ZnGaNO two-phase composite structure powder

[0065] (1) 2 grams of Ga(NO 3 ) 3 9H 2 O and 7.4 g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 100 mL of aqueous solution, then the mixed metal solution of gallium and zinc was poured into 75 mL of 0.1M Na 2 CO 3 In the solution, the mixing speed is 1mL / s, and the stirring speed is 500rpm; when all the metal solution is poured, adjust the pH of the mixed solution to 9 with 2M NaOH solution;

[0066] (2) Put the obtained mixed solution in a water bath at 80° C. for 12 hours while keeping constant stirring.

[0067] (3) centrifuging the precipitate and washing it with deionized water, repeated three times; drying the centrifuged precipitate at 80° C. for 12 hours to obtain a white solid;

[0068] (4) The precursor was obtained by grinding the white solid into powder with an agate mortar. Put the precursor into a high-temperature energy-saving tube furnace for sintering at 800°C and react with...

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Abstract

The invention discloses a method for preparing ZnO / ZnGaNO two-phase composite structure photocatalytic powder. The method comprises the following steps: preparing a hydroxide precursor containing Zn and Ga ions in an aqueous solution by utilizing a co-precipitation method for reducing the pH value; nitriding the precursor, thereby obtaining the composite structure powder of which the interior is provided with ZnO nanosheets and the surface is provided with ZnGaNO solid solution nano particles. The powder is high in photocatalytic degradation efficiency of methylene blue aqueous solution under visible light and is high in decoloring power. The method disclosed by the invention is simple in process, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a preparation method of ZnO / ZnGaNO two-phase composite structure photocatalytic powder. Background technique [0002] Worldwide environmental pollution and ecological damage have caused people to pay great attention to high-efficiency, energy-saving, and non-secondary pollution environmental governance technologies. In recent years, photocatalytic oxidation technology has shown broad application prospects as a treatment method for toxic or refractory organic pollutants. The basic principle of photocatalytic technology is: when the semiconductor photocatalyst is subjected to energy greater than the forbidden band width (E g ) light irradiation, the electrode on its valence band (e － ) is excited, crosses the forbidden band and enters the conduction band, leaving a positively charged hole (h + ). Photogenerated holes are extremely oxidizing and can directly oxidize organ...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 胡艳玲朱君秋刘胜左娟孙东亚胡业奇许龙山林昌健杨游煌陈国滨
Owner XIAMEN UNIV OF TECH
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