Preparation method of potassium-doped nano titanium dioxide photo-catalyst

A nano-titanium dioxide and photocatalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of high preparation cost and difficult practical application, and achieve The effect of low preparation cost, improved photocatalytic activity and convenient operation

Inactive Publication Date: 2014-05-07
NANTONG UNIVERSITY
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  • Application Information

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Problems solved by technology

[0007] Although metal elements doped TiO 2 There are many research reports, but so far most of the doping elements are concentrated in rare earth metals such as La, Ce, Er, Pr, Gd, Nd, Sm, Zn, Fe, Ag, transition metals and noble metals. The preparation cost is high, and it is difficult to obtain practical application

Method used

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  • Preparation method of potassium-doped nano titanium dioxide photo-catalyst
  • Preparation method of potassium-doped nano titanium dioxide photo-catalyst
  • Preparation method of potassium-doped nano titanium dioxide photo-catalyst

Examples

Experimental program
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Embodiment 1

[0033] Slowly add 20 mL of tetrabutyl titanate dropwise into 70 mL of absolute ethanol under stirring, then add 6.7 mL of acetylacetone and 15.4 mL of Triton X-100, then add 1 g of polyethylene glycol, continue Stir for 2 hours to obtain solution A; Add 0.1532g of potassium hydroxide to 8mL double distilled water, then add the water and ethanol mixture prepared according to the volume ratio of double distilled water and absolute ethanol at 1:3, and use 1:1 Adjust the pH value to 3 with hydrochloric acid, and stir for 0.2 hours to obtain solution B; slowly add solution B to solution A at a volume ratio of 1:3.2 between solution B and solution A, and continue stirring for 2 hours after the addition is complete. Stand and age naturally to gel. Pour the gel into the tray and dry it in an oven at 100°C. Grind the dry gel into powder and pour it into a crucible, put it in a muffle furnace, and heat it up to 550°C according to the program of 5°C / min for roasting 2.5h, then naturally...

Embodiment 2

[0035] The difference between this embodiment and Example 1 is that the firing temperature is 650° C., and the others are the same as Example 1. The resulting potassium-doped nano-TiO 2 with undoped nano-TiO 2 For comparison of the X-ray (XRD) spectrum, see figure 1 .

[0036] From figure 1 It can be seen that for undoped TiO 2 , the rutile phase appeared in the crystal, while for doped TiO 2 , it can be seen that due to potassium doping, the 101 plane diffraction peak becomes sharper and stronger, and no rutile phase diffraction peak appears. show K + Doping prevents the generation of the rutile phase. XRD did not detect potassium oxide diffraction peaks, indicating that K + Fully incorporated and evenly dispersed into TiO 2 in the crystal lattice and form a solid solution with it. Potassium-doped nano-TiO was calculated according to the Scherrer formula 2 The grain size is 17.9nm, while undoped TiO 2 The particle size is 30.7nm, indicating that K + Doping suppre...

Embodiment 3

[0039] The difference between this embodiment and Example 1 is that the added potassium hydroxide is 0.2213g, and the potassium-doped nano-TiO with a doping concentration of 6.5% is obtained. 2 , others are identical with embodiment 1.

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Abstract

The invention relates to a preparation method of a potassium-doped nano titanium dioxide photo-catalyst. According to the preparation method of the potassium-doped nano titanium dioxide photo-catalyst, potassium is taken as a doped element; potassium is doped into crystal lattices of TiO2, so that compounding of photoproduction electrons and cavities is stopped; a spectral response range is promoted to move to a visible region; and photo-catalytic activity of titanium dioxide is effectively improved. The potassium-doped nano titanium dioxide photo-catalyst prepared by the method is high in photo-catalytic activity and can process organic wastewater with good effect; the preparation method of the potassium-doped nano titanium dioxide photo-catalyst has the advantages that the process is simple, conditions are easily controlled, the production cost is low and the large-scale production is facilitated.

Description

[0001] Technical field [0002] The present invention involves a preparation method for a potassium doped nano -titanium dioxide catalyst. [0003] Background technique [0004] Titanium dioxide as a catalyst for pollutants has the advantages of stable catalysts, no secondary pollution, and wide pollutants.However, the electronics and holes generated by the light are easy to compound, resulting in the low yield of light quantum quantum, which limits TIO 2 The application of catalytic technology in actual; in addition, TIO 2 It is a wide -band semiconductor that requires high -energy ultraviolet light in order to stimulate the electrons in the price belt, while the vast majority of the visible light parts in the solar spectrum fail to use it effectively.Therefore, effectively reduces the compound of photochemical electron-floor-to-ground pairs and improve TIO 2 Light catalytic activity and efficiency, expand TIO 2 The spectrum response amplitude can make TIO 2 The catalyst is bett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/04C02F1/32
CPCY02W10/37
Inventor 景晓辉程海军丁欣宇曹宇锋
Owner NANTONG UNIVERSITY
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