Preparation method of TiO2 photocatalyst by loading TiO2 to diatomite formed in advance and doping rare earth

A rare earth doping and photocatalyst technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, botanical equipment and methods, etc., can solve the problems of sunlight utilization limitation and photocatalytic reaction rate limitation, and achieve simple molding process , Excellent photocatalytic performance and stability, and the effect of improving photodegradation efficiency

Inactive Publication Date: 2015-11-25
NORTHEASTERN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] Second, due to TiO 2 The band gap is wide and can only be activated by ultraviolet light below 380nm, which greatly limits the u

Method used

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  • Preparation method of TiO2 photocatalyst by loading TiO2 to diatomite formed in advance and doping rare earth

Examples

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Example Embodiment

[0021] Example 1: First, weigh 20 g of diatomaceous earth, add 100 g of sulfuric acid with a mass fraction of 60%, pickling at 65°C for 95 minutes, suction filtration, drying, and calcination at 500°C for 5 hours. Then weigh 10g of the pretreated diatomaceous earth, add 0.3g dextrin, 0.2g hydroxypropyl methylcellulose, 0.4g sodium carbonate, 13ml deionized water, and use a multifunctional pellet machine to make the diatomaceous earth Spherical type, dried at 80℃ for 4h and calcined at 800℃ for 2h. Finally, a sol-gel method is used to prepare the titanium dioxide sol; the spherical diatomaceous earth is put into the sol, immersed for 3 hours, then dried, and calcined at 600° C. for 2 hours to obtain a supported photocatalyst.

Example Embodiment

[0022] Example 2: First weigh 20 g of diatomaceous earth, add 120 g of sulfuric acid with a mass fraction of 40%, pickling at 50°C for 75 minutes, suction filtration, drying, and calcination at 600°C for 4 hours. Then weigh 10g of the pretreated diatomaceous earth, add 0.5g dextrin, 0.1g sodium carbonate, 12ml deionized water, use a multifunctional pellet machine to make the diatomaceous earth into a ball shape, and dry it at 70°C for 6 hours. Calcined at 900°C for 2h. Finally, a sol-gel method is used to prepare rare earth cerium-doped titanium dioxide sol, in which the cerium doping amount is 0.5%; the spherical diatomaceous earth is put into the sol, immersed for 2h, then dried, and calcined at 600℃ for 1.5h. Get the supported composite photocatalyst.

Example Embodiment

[0023] Example 3: First, weigh 20 g of diatomaceous earth, add 140 g of sulfuric acid with a mass fraction of 10%, pickling at 80°C for 30 minutes, suction filtration, drying, and calcination at 300°C for 6 hours. Then weigh 10g of the pretreated diatomaceous earth, add 0.3g of hydroxypropyl methylcellulose, 0.2g of sodium carbonate, and 11ml of deionized water. Use a multifunctional pellet machine to make the diatomaceous earth into a ball shape. Drying at ℃ for 12h, calcining at 700℃ for 4h. Finally, a sol-gel method is used to prepare rare earth cerium-doped titania sol, in which the cerium doping amount is 0.3%; the spherical diatomaceous earth is put into the sol, immersed for 5h, then dried, and calcined at 700℃ for 1h. Supported composite photocatalyst.

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Abstract

The invention relates to a preparation method of TiO2 photocatalyst by loading TiO2 to diatomite formed in advance and doping rare earth, and belongs to the technical field of photocatalysis. The preparation method comprises the steps of: pickling original diatomite, roasting the pickled diatomite, and uniformly mixing the roasted diatomite, a binder, a fluxing agent and the like so as to obtain molded diatomite; and using tetrabutyl orthotitanate and dehydrated alcohol as raw materials, preparing TiO2 and rare earth doped TiO2 sol by a sol-gel method, macerating the preformed diatomite in the sol, drying the macerated diatomite, and calcining the dried diatomite so as to obtain the load type photocatalyst. The photocatalyst can prevent the TiO2 from running off; besides, the rare earth is doped, so that the utilization rate of visible light by the TiO2 is increased; when a mercury-vapor lamp is used for 3 hours, 95% of a rhodamine b solution can be degraded; when the photocatalyst is illuminated for an hour under sunlight, escherichia coli can be thoroughly killed; when the photocatalyst is illuminated for 24 hours by common daylight lamps, 92% of methanal can be degraded; the photocatalyst is excellent in photocatalytic property and stability, which indicates that the photocatalyst has favorable application prospects in the respects of waste water treatment, sanitation and sterilization, air purification and the like.

Description

technical field [0001] The invention relates to loading TiO after preforming diatomite 2 and rare earth doped TiO 2 The invention discloses a method for preparing a photocatalyst, belonging to the technical field of mineral materials and photocatalysis. Background technique [0002] Photocatalytic technology has shown great application potential in sewage treatment, cleaning and sterilization, air purification, etc. TiO 2 As a photocatalytic material, it has attracted widespread attention due to its advantages such as good chemical stability, strong oxidation ability, non-toxicity, corrosion resistance, and cheap availability. However, TiO 2 There are two limitations in practical application. [0003] One is due to TiO 2 The particle size is small, easy to agglomerate, and it is difficult to recycle and reuse after photocatalytic reaction, thus affecting its industrialization. In order to make full use of TiO 2 The photocatalytic performance of TiO needs to be 2 fixe...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J37/00C02F1/30B01D53/86A01N59/16A01P1/00
Inventor 刘奎仁于晓娟韩庆陈建设
Owner NORTHEASTERN UNIV
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