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Method of producing high visible light active nano titanium dioxide photocatalyst codoped with nitrogen and indium

A nano-photocatalyst, titanium dioxide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of difficult to achieve industrial scale production, high equipment requirements, high cost, etc., to achieve visible light activity improvement , low equipment requirements, and small product particle size

Inactive Publication Date: 2008-02-27
NANKAI UNIV
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Problems solved by technology

Although In 3+ doped TiO 2 and non-metallic N-doped TiO 2 Under the excitation of visible light, the photocatalytic activity is significantly improved compared with pure titanium dioxide, but there is still room for further improvement in its photocatalytic efficiency and visible light utilization rate, and its visible light response mechanism is still controversial, and more in-depth research is needed. Research
Simultaneous doping methods such as sol-gel method, hydrothermal synthesis method, vapor phase deposition method, ion beam sputtering method, etc. generally have the problem of high cost or high equipment requirements, and it is difficult to achieve industrial scale production

Method used

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  • Method of producing high visible light active nano titanium dioxide photocatalyst codoped with nitrogen and indium

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Take 3.03ml of InCl with a concentration of 0.6mol / L at room temperature 3 Put the solution into a beaker, add 40ml of absolute ethanol, and stir on a magnetic stirrer to obtain a mixed solution. Slowly add 12ml of tetrabutyl titanate (concentration: 98%) to obtain a uniform light yellow transparent solution. The pH value is controlled at about PH=0.5 by adding a certain amount of HCl. After 5 minutes, 3 ml of 25% ammonia water was added, and a precipitate formed rapidly. Put the white precipitate in a watch glass, put it in an oven, and bake it at 100°C for 12 hours to obtain dry amorphous doped TiO 2 Powder. Grinding, and finally putting the dry powder into a muffle furnace, calcining at 450°C for 2.5 hours to obtain nitrogen and indium double-doped TiO 2 Nano powder catalyst (a). In this catalyst, TiO 2 Be anatase phase and rutile phase mixed crystal (see the XRD spectrogram a curve of accompanying drawing 1 sample), wherein TiO 2 The molar ratios to the In ele...

Embodiment 2

[0020] Experimental condition, step are the same as embodiment one, change InCl 3 The addition amount of solution is 4.33ml, makes TiO 2 Nitrogen-indium double-doped TiO with molar ratios of In and N elements of 100:7.53 and 0.86:1, respectively 2 For the rice powder catalyst (b), using the above photocatalytic activity evaluation method, the degradation rate of p-chlorophenol was 78.43% after 8 hours under visible light irradiation.

Embodiment 3

[0022] Experimental condition, step are the same as embodiment one, change InCl 3 The addition amount of solution is 6.40ml, makes TiO 2 Nitrogen and indium double-doped TiO with molar ratios of In and N elements of 100:11.11 and 0.86:1, respectively 2 Nano powder catalyst (c), using the above photocatalytic activity evaluation method, under visible light irradiation, the degradation rate of p-chlorophenol after 8 hours is 66.67%.

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Abstract

the invention discloses a new making method of titanium oxide catalyst with high-visible light catalytic activity doped by nitrogen and indium element, which is characterized by the following: adopting titanate ester as primer and nitrogen compound and indium salt as doping agent; using hydrolytic sediment to make nanometer optical catalyst of anatase phase and rutile phased mixed crystal with even grain size of the catalyst at 8. 4nm, crystal form at anatase phase and rutile phase with strong visible optical catalyst activity. The invention uses one non-metal element and one metal ion to dop to prepare the titanium oxide catalyst with high visible optical catalytic activity to be used in the environmental scientific and engineering domain, which has low request for equipment, small grain size for product, large specific surface area, good dispersibility and higher visually optical activity than pure TiO2, single nitrogen doped TiO2 and single indium doped TiO2.

Description

【Technical field】 [0001] The invention relates to a method for preparing a titanium dioxide nano-powder catalyst, which belongs to the technical field of catalysis. More specifically, the invention provides a nano-titanium dioxide photocatalyst which is co-doped with nitrogen and indium and has high visible light catalytic activity. Methods. 【Background technique】 [0002] At present, in the field of environmental photocatalysis research, the most researched and considered the best semiconductor material is titanium dioxide photocatalyst. However, due to its wide band gap (3.2eV, anatase crystal form), TiO 2 It can only be excited by ultraviolet light with a wavelength less than 387nm, and has poor spectral response to visible light. Therefore, in the study of photocatalysis in solar environment, broaden the TiO 2 The response to visible light has become a subject with theoretical significance and application prospects. [0003] Over the years, scientists engaged in phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J27/24
Inventor 曹亚安王恩君
Owner NANKAI UNIV
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