Method for preparing tantalum-potassium composite oxide photocatalyst

A technology of composite oxides and photocatalysts, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of high synthesis temperature, poor crystallinity, photocatalytic The performance has not been reported and other problems, and the effect of low reaction temperature, reduction of hard agglomeration of powder, and small particle size is achieved.

Inactive Publication Date: 2009-11-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tantalum-potassium composite oxide is a representative photocatalyst with high photocatalytic activity. The traditional preparation method adopts solid phase method, but the synthesis temperature of this method is high and the crystallinity is poor.
Tantalum Potassium Composite Oxide K 2 Ta 2 o 6 It is difficult to synthesize by solid-phase synthesis method, and its photocatalytic performance has not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method of tantalum potassium composite oxide photocatalyst, it comprises the steps:

[0019] 1) Weigh 5.0000gTa 2 o 5 and 6.3363gKOH(Ta 2 o 5 The molar ratio to KOH is 1:10), put it into a corundum crucible, stir and mix evenly, and burn at 500°C for 4h to obtain a melt of potassium tantalate; dissolve the melt in deionized water at a temperature of 40°C, Filtration, the filtered filtrate (or clear liquid) is adjusted to pH with nitric acid to make the solution strongly acidic (pH2 o 5 ·nH 2 (2) form is precipitated out; Filtration, the gained precipitate is rinsed 5 times with deionized water, removes the residual potassium ion (removing residual potassium ion in precipitation) of its adsorption, obtains white tantalic acid precipitate;

[0020] 2) Select oxalic acid according to the molar ratio of oxalic acid and tantalum acid precipitation of 5.0:1; gradually add oxalic acid into the beaker with white tantalic acid precipitation and replenish dei...

Embodiment 2

[0027] The preparation method of tantalum potassium composite oxide photocatalyst, it comprises the steps:

[0028] 1) Weigh 5.0000gTa 2 o 5 and 6.3363gKOH(Ta 2 o 5 The molar ratio to KOH is 1:10), put it into a corundum crucible, stir and mix evenly, and burn at 550°C for 4h to obtain a melt of potassium tantalate; dissolve the melt in deionized water at a temperature of 40°C, Filtration, the filtered filtrate (or clear liquid) is adjusted to pH with nitric acid to make the solution strongly acidic (pH2 o 5 ·nH 2 (2) form is precipitated out; Filter, and the gained precipitate is rinsed 6 times with deionized water, removes the residual potassium ion of its adsorption, obtains white tantalic acid precipitate;

[0029] 2) According to the molar ratio of oxalic acid and tantalum acid in the precipitation of tantalum is 5.5:1, select oxalic acid; gradually add oxalic acid into the beaker with white tantalic acid precipitation and replenish deionized water in time, and keep ...

Embodiment 3

[0036] The preparation method of tantalum potassium composite oxide photocatalyst, it comprises the steps:

[0037] 1) Weigh 5.0000gTa 2 o 5 and 6.3363gKOH(Ta 2 o 5 The molar ratio to KOH is 1:10), put it into a corundum crucible, stir and mix evenly, and burn at 500°C for 4h to obtain a melt of potassium tantalate; dissolve the melt in deionized water at a temperature of 40°C, Filtration, the filtered filtrate (or clear liquid) is adjusted to pH with nitric acid to make the solution strongly acidic (pH2 o 5 ·nH 2 O) form precipitates out; Filter, and the gained precipitate is rinsed 2 times with deionized water, removes the residual potassium ion of its adsorption, obtains white tantalic acid precipitate;

[0038] 2) According to the molar ratio of tantalum in oxalic acid and tantalic acid precipitation is 4.5:1, select oxalic acid; gradually add oxalic acid into the beaker with white tantalic acid precipitation and replenish deionized water in time, and keep stirring at...

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Abstract

The invention relates to a method for preparing a tantalum-potassium composite oxide photocatalyst. The method for preparing the tantalum-potassium composite oxide photocatalyst is characterized by comprising the following steps: 1) according to a mol ratio of Ta2O5 to KOH between 1 to 2 and 1 to 20, selecting Ta2O5 and KOH to prepare white tantalic acid precipitate; 2) adding oxalic acid to form water-soluble oxalic acid solution of tantalum; 3) adding potassium nitrate and citric acid to form mixed solution; 4) adding glycol as an esterification agent into the mixed solution to generate a sticky frothy brown substance; 5) further coking the obtained brown substance for 3 to 4 hours in a muffle furnace at 450 DEG C, and grinding the coked substance to obtain a precursor of a tantalum-potassium composite oxide; and 6) baking the precursor of the tantalum-potassium composite oxide for 1 to 8 hours at the temperature between 700 and 800 DEG C, cooling the baked precursor to room temperature and then grinding the cooled precursor to obtain the tantalum-potassium composite oxide photocatalyst. The method has the advantages of safe operation, simple process, low reaction temperature, short time and low cost.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to a preparation method of a tantalum potassium composite oxide photocatalyst. technical background [0002] At present, organic dye wastewater is recognized as one of the difficult-to-treat wastewater, which has the characteristics of complex components and refractory degradation. The photocatalytic oxidation technology has the advantages of high efficiency, energy saving, and no secondary pollution in the treatment of such wastewater. Therefore, it has always attracted people's attention. Choosing a suitable photocatalyst is a key factor for the correct application of this technology. Titanium dioxide photocatalysts have been widely used, and people have been researching and exploring other systems of high-efficiency photocatalysts. [0003] In ultraviolet photocatalysts, tantalum-based composite oxides have become an important part of existing photocatalytic materials ...

Claims

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Application Information

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IPC IPC(8): B01J23/20B01J37/00C02F1/32C02F101/30
Inventor 张高科蒋韦杨艳青余姝洁张水明沈雄
Owner WUHAN UNIV OF TECH
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