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Method for synthesizing rare earth doped potassium titanate powder with photocatalytic activity

A photocatalytic activity, potassium titanate technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as difficult to degrade organic pollutants, and achieve Strong visible light catalytic activity, high visible light utilization, and size controllable effects

Inactive Publication Date: 2014-07-02
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, one-sidedly improving the absorption of visible light by photocatalysts can only obtain some holes with low oxidation ability, and such holes are not only difficult to degrade stable organic pollutants (such as benzene rings and aliphatic chains, etc.), but also cannot Efficiently oxidizes water molecules to generate hydroxyl radicals (·OH) with strong oxidizing power

Method used

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  • Method for synthesizing rare earth doped potassium titanate powder with photocatalytic activity
  • Method for synthesizing rare earth doped potassium titanate powder with photocatalytic activity
  • Method for synthesizing rare earth doped potassium titanate powder with photocatalytic activity

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Experimental program
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Effect test

Embodiment 1

[0035] (1) Yb(NO 3 ) 3 ·5H 2 O was dissolved in distilled water to form a concentration of 0.2 mol l -1 Stable and transparent Yb(NO 3 ) 3 solution;

[0036] (2) TiCl 3 and KCl solution and Yb(NO) prepared in step (1) 3 ) 3 The solutions are mixed so that Yb in the mixed solution 3+ : Ti 3+ :K + The molar ratio is 0.5:99.5:50, and the pH value is adjusted to 7.5 with ammonia water;

[0037] (3) Add a slightly excess saturated urea solution to the mixed solution in step (2) until the pH value is 9.5, and heat to 75°C until a uniform and stable mixed precipitation liquid phase (that is, the precursor, including the mixed precipitation and KCl solution);

[0038] (4) The precursor obtained in step (3) was stirred, dried, and ground for later use, and then Na 2 CO 3 The molten salt and the precursor powder are mixed according to the mass ratio of molten salt / precursor = 4:1, dried, placed in a ceramic crucible, calcined at 1000°C, and kept at the highest temperature ...

Embodiment 2

[0041] (1) will Ce 2 o 3 Dissolve with concentrated nitric acid to form a concentration of 0.05mol l -1 Stable and transparent Ce(NO 3 ) 3 solution;

[0042] (2) will KNO 3 Solution and the Ce(NO 3 ) 3 The solution is mixed first, and then slowly dripped into the butyl titanate solution under the condition of rapid stirring, so that the Ce in the mixed solution 3+ : Ti 3+ :K + The molar ratio is 0.3:99.9:35, and the pH value is adjusted to 6.5 with ammonia water;

[0043] (3) Add a slight excess of 2mol l to the mixed solution in step (2) -1 NaOH solution to a pH value of 9.5 to form a uniform and stable mixed precipitation liquid phase (that is, the precursor, including mixed precipitation and KNO 3 solution);

[0044] (4) Stir and dry the precursor obtained in step (3), grind it for later use, and then add NaNO 3 The molten salt and the precursor powder are mixed according to the mass ratio of composite molten salt / precursor = 3:1, dried, and placed in a ceramic...

Embodiment 3

[0047] (1) First put Er 2 o 3 Dissolve with concentrated nitric acid to form 0.1mol·l -1 Stable and transparent Er(NO 3 ) 3 solution;

[0048] (2) TiCl 3 solution and K 2 CO 3 solution with Er(NO 3 ) 3 Solution according to (Er 3+ : Ti 3+ :K + ) with a molar ratio of (0.3:99.7:50) for mixing, and adjust the pH value to 7 with ammonia water,

[0049] (3) Add a slightly excess saturated urea solution to the mixed solution in step (2) until the pH value is 7.0, and heat to 75°C until a uniform and stable mixed precipitation liquid phase (that is, the precursor, including the mixed precipitation) is formed with K 2 CO 3 solution);

[0050] (4) Dry and grind the obtained precursor for later use, and then NaNO 3 The molten salt and precursor powder are mixed according to the mass ratio of molten salt / precursor = 3:1, dried, and placed in a ceramic crucible, calcined at about 700 ° C, and kept at the highest temperature for 2 hours;

[0051] (5) Finally, the crucible...

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Abstract

The invention belongs to the technical field of synthesis of photocatalytic materials and discloses a method for synthesizing rare earth doped potassium titanate powder with photocatalytic activity. The rare earth ion doped potassium titanate photocatalytic powder is prepared through a coprecipitation-fused salt method. Because a visible-ultraviolet upconversion effect of rare earth ions is utilized, the powder has the obvious advantages of high visible light utilization rate, electron-hole recombination probability, high visible light catalytic activity and the like. The experiment proves that the visible light is simulated through a high-pressure halogen lamp, when the concentration of the catalyst is 1g / L, after a 10mg / L of methylene blue solution is catalyzed for 30 minutes, the degradation rate can reach over 92 percent, and the catalyst is superior to a commercially available photocatalyst TiO2 (P25). In addition, compared with a traditional solid phase method, the method has the advantages that the powder is narrow in particle size distribution, controllable in size and uniform in doping.

Description

technical field [0001] The invention relates to the technical field of photocatalytic material synthesis, in particular to a method for synthesizing rare earth ion-doped potassium titanate powder with photocatalytic activity. Background technique [0002] TiO 2 It has the advantages of non-toxicity, good chemical stability, high activity and long persistence, and has been widely used in various photocatalytic fields for many years. However, with the continuous improvement of the performance requirements of photocatalytic materials in modern industry, TiO 2 The defects of photocatalysts, such as low solar energy utilization efficiency and high recombination rate of photogenerated carriers, have become increasingly prominent. For this reason, researchers have focused on TiO 2 A lot of research work has been carried out on the modification of , and the development of new high-efficiency photocatalysts. with TiO 2 Compared with traditional bulk photocatalysts, potassium tit...

Claims

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Application Information

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IPC IPC(8): B01J23/10
Inventor 邓义群沈针
Owner JIANGXI UNIV OF SCI & TECH
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